FileIOPermission クラス

.NET Framework クラス ライブラリ リファレンス

FileIOPermission クラス

ファイルおよびフォルダにアクセスするための機能を制御します。このクラスは継承できません。

名前空間: System.Security.Permissions
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class
 FileIOPermission
    Inherits CodeAccessPermission
    Implements IUnrestrictedPermission

Visual Basic (使用法)

Dim instance As FileIOPermission

C#

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public sealed class FileIOPermission : CodeAccessPermission,
 IUnrestrictedPermission

C++

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class FileIOPermission sealed :
 public CodeAccessPermission, IUnrestrictedPermission

J#

/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class FileIOPermission extends
 CodeAccessPermission implements IUnrestrictedPermission

JScript

SerializableAttribute 
ComVisibleAttribute(true) 
public final class FileIOPermission extends
 CodeAccessPermission implements IUnrestrictedPermission

解説

このアクセス許可は、FileIOPermissionAccess によって提供される、次の 4 種類のファイル IO アクセスに区別されます。

• Read: ファイルの内容を読み取るために必要なアクセス権、またはファイルの長さや最終更新時刻などの情報へのアクセス権。

• Write: ファイルの内容に書き込むために必要なアクセス権、またはファイル名などのファイルに関する情報を変更するために必要なアクセス権。削除および上書きもできます。

• Append: ファイルの末尾に書き込むために必要なアクセス権。読み取ることはできません。

• PathDiscovery: パス自体に存在する情報へのアクセス。これにより、ユーザー名などのパス中の機密情報だけではなく、パスによって判明するディレクトリ構造についての情報も保護されます。この値は、パスによって表されたファイルまたはフォルダへのアクセスを与えません。

これらのアクセス許可はすべて独立しています。つまり、あるアクセス許可に別のアクセス許可は含まれません。たとえば、Write アクセス許可に Read アクセス許可または Append アクセス許可は含まれません。複数のアクセス許可が必要な場合は、次のコード例で示すように、ビットごとの OR を使用して結合できます。ファイルのアクセス許可は、標準絶対パスで定義されます。呼び出しは、常に標準のファイル パスで行う必要があります。

FileIOPermission は、ファイルおよびフォルダの操作に対する保護方法を管理します。File クラスは、ファイルおよびフォルダに対する安全なアクセスを提供します。ファイルへのハンドルが作成されると、セキュリティ アクセス チェックが実行されます。作成時にこのチェックを行うことによって、セキュリティ チェックのパフォーマンスに与える影響が最小限になります。ファイルを開く回数は 1 回ですが、ファイルを開いている間に読み取りと書き込みは何度も行うことができます。ファイルが開かれた後は、チェックは行われません。信頼関係のない呼び出し元にオブジェクトが渡された場合は、渡されたオブジェクトが不正使用される可能性があります。たとえば、ファイル ハンドルは、低いアクセス許可しか持たないコードでもアクセスできるパブリック グローバル スタティックスには格納しないでください。

FileIOPermissionAccess は、ファイルまたはフォルダで実行できるアクションを指定します。また、これらのアクションは、ビットごとの OR を使用して結合すると、複雑なインスタンスを形成できます。

フォルダへのアクセスとは、そのフォルダが格納しているすべてのファイルへのアクセス、およびそのサブフォルダ内のすべてのファイルとフォルダへのアクセスを意味します。たとえば、C:\folder1\ への Read アクセスは、C:\folder1\file1.txt、C:\folder1\folder2\、C:\folder1\folder2\file2.txt などへの Read アクセスを意味します。

メモ

\\server\share\bogusfolder\..\file 形式のパスはセキュリティ システムによって標準形式の \\server\share\file に変換されるため、Deny を使用するときは、\\server\share\file のような正規形式のパスだけを対象にすればよく、同じパスを示す他の表記形式を考慮する必要はありません。ドット演算子 (.) は、単一で使用することも複数使用することもできます。また、文字列の末尾の空白文字と組み合わせて使用することもできます。ドット演算子の後の空白は無視されます。アドレス C:\temp\test\.\test.txt のような単一のドットは無視されるため、このアドレスの場合、C:\temp\test\test.txt になります。複数のドット演算子は ".." として扱われます。これは、直前のディレクトリが省略されることを意味します。たとえば、アドレス C:\temp\test\....\test.txt は、パス C:\temp\test.txt になります。

メモ
Deny は、Windows NTFS ファイル システムで使用した場合に最も効果を発揮します。NTFS のセキュリティ機能は、FAT32 よりも大幅に優れています。NTFS の詳細については、Windows のマニュアルを参照してください。

使用例

FileIOPermission を使用するコードを次の例に示します。次の 2 行のコードの後で、オブジェクト f は、クライアント コンピュータのローカル ディスク上のすべてのファイルを読み取るためのアクセス許可を表します。

Visual Basic

Dim f As New FileIOPermission(PermissionState.None)
f.AllLocalFiles = FileIOPermissionAccess.Read

C#

FileIOPermission f = new FileIOPermission(PermissionState.None);
f.AllLocalFiles = FileIOPermissionAccess.Read;

C++

FileIOPermission^ f = gcnew FileIOPermission( PermissionState::None );
f->AllLocalFiles = FileIOPermissionAccess::Read;

J#

FileIOPermission f = new FileIOPermission(PermissionState.None);
f.set_AllLocalFiles(FileIOPermissionAccess.Read);

次の 2 行のコードの後で、オブジェクト f2 は、C:\test_r を読み取るためのアクセス許可と C:\example\out.txt に対する読み取りと書き込みのためのアクセス許可を表します。Read と Write は、前述のとおり、ファイルおよびフォルダのアクセス許可を表します。

Visual Basic

Dim f2 As New FileIOPermission(FileIOPermissionAccess.Read,
 "C:\test_r")
f2.AddPathList(FileIOPermissionAccess.Write Or _
   FileIOPermissionAccess.Read, "C:\example\out.txt")

C#

FileIOPermission f2 = new FileIOPermission(FileIOPermissionAccess.Read,
 "C:\\test_r");
f2.AddPathList(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, "C:\\example\\out.txt");

C++

FileIOPermission^ f2 = gcnew FileIOPermission( FileIOPermissionAccess::Read,"C:\\test_r"
 );
f2->AddPathList( (FileIOPermissionAccess) (FileIOPermissionAccess::Write | FileIOPermissionAccess::Read),
 "C:\\example\\out.txt" );

J#

FileIOPermission f2 = 
    new FileIOPermission(FileIOPermissionAccess.Read, "C:\\test_r");
f2.AddPathList(FileIOPermissionAccess.Write | 
    FileIOPermissionAccess.Read, "C:\\example\\out.txt");

FileIOPermission のさまざまなメンバの使用例を次に示します。

Visual Basic

Imports System
Imports System.Security
Imports System.Security.Permissions
Imports System.Collections
Imports Microsoft.VisualBasic

<Assembly: CLSCompliant(True)> 

Public Class FileIOPermissionDemo

    ' IsSubsetOf determines whether the current permission is a subset
 of the specified permission.
    ' This method compares various FileIOPermission paths with FileIOPermissionAccess
 set to AllAccess.
    Private Function IsSubsetOfDemo() As
 Boolean

        Dim returnValue As Boolean
 = True
        Dim fileIO1 As String
 = ""
        Dim fileIO2 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission

        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess,
 fileIO1)
            End If

            Console.WriteLine("**********************************************************"
 & ControlChars.Lf)

            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)
                If fileIO2 = ""
 Then
                    fileIOPerm2 = New FileIOPermission(PermissionState.None)
                Else
                    fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.AllAccess,
 fileIO2)
                End If
                Dim firstPermission As String
 = IIf(fileIO1 = "" Or fileIO1
 Is Nothing, "null", fileIO1)
                Dim secondPermission As String
 = IIf(fileIO2 = "" Or fileIO2
 Is Nothing, "null", fileIO2)
                If fileIOPerm2 Is Nothing
 Then
                    GoTo ContinueWhile2
                End If
                Try
                    If fileIOPerm1.IsSubsetOf(fileIOPerm2) Then

                        Console.WriteLine((firstPermission & "
 is a subset of " & secondPermission & ControlChars.Lf))
                    Else
                        Console.WriteLine((firstPermission & "
 is not a subset of " & secondPermission & ControlChars.Lf))
                    End If

                Catch e As Exception
                    Console.WriteLine(IIf("An exception was thrown
 for subset :" & fileIO1 = "", "null",
 IIf(fileIO1 & ControlChars.Lf & fileIO2 = "", "null", fileIO2 & ControlChars.Lf & e.ToString())))
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While
        Return returnValue
    End Function 'IsSubsetOfDemo

    ' Union creates a new permission that is the union of the current
 permission and the specified permission.
    Private Function UnionDemo() As
 Boolean

        Dim returnValue As Boolean
 = True

        Dim fileIO1 As String
 = ""
        Dim fileIO2 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission
        Dim fileIOPerm3 As IPermission

        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1)
            End If
            Console.WriteLine("**********************************************************"
 & ControlChars.Lf)
            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)

                Try
                    If fileIO2 = ""
 Then
                        fileIOPerm2 = New FileIOPermission(PermissionState.None)
                    Else
                        fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO2)
                    End If
                    Dim firstPermission As String
 = IIf(fileIO1 = "" Or fileIO1
 Is Nothing, "null", fileIO1)
                    Dim secondPermission As String
 = IIf(fileIO2 = "" Or fileIO2
 Is Nothing, "null", fileIO2)
                    fileIOPerm3 = CType(fileIOPerm1.Union(fileIOPerm2), FileIOPermission)
                    fileIOPerm3 = fileIOPerm1.Union(fileIOPerm2)

                    If fileIOPerm3 Is Nothing
 Then
                        Console.WriteLine(("The union of "
 & firstPermission & "  and " & secondPermission
 & " is null."))
                    Else
                        Console.WriteLine(("The union of "
 & firstPermission & "  and " & secondPermission
 & " = " & ControlChars.Lf & ControlChars.Tab & CType(fileIOPerm3, FileIOPermission).GetPathList(FileIOPermissionAccess.Read)(0)))
                    End If
                Catch e As Exception
                    Console.WriteLine(("An exception was thrown
 for union " & e.ToString()))
                    returnValue = False
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While


        Return returnValue
    End Function 'UnionDemo

    ' Intersect creates and returns a new permission that is the intersection
 of the current 
    ' permission and the permission specified.
    Private Function IntersectDemo() As
 Boolean

        Dim returnValue As Boolean
 = True

        Dim fileIO1 As String
 = ""
        Dim fileIO2 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2, fileIOPerm3 As
 FileIOPermission

        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1)
            End If
            Console.WriteLine("**********************************************************"
 & ControlChars.Lf)
            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)
                If fileIO2 = ""
 Then
                    fileIOPerm2 = New FileIOPermission(PermissionState.None)
                Else
                    fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO2)
                End If
                Dim firstPermission As String
 = IIf(fileIO1 = "" Or fileIO1
 Is Nothing, "null", fileIO1)
                Dim secondPermission As String
 = IIf(fileIO2 = "" Or fileIO2
 Is Nothing, "null", fileIO2)
                Try

                    fileIOPerm3 = CType(fileIOPerm1.Intersect(fileIOPerm2), FileIOPermission)
                    If Not (fileIOPerm3 Is
 Nothing) AndAlso Not (fileIOPerm3.GetPathList(FileIOPermissionAccess.Read)
 Is Nothing) Then

                        Console.WriteLine(("The intersection of
 " & firstPermission & "  and "
 & ControlChars.Lf & ControlChars.Tab & secondPermission & " = " & ControlChars.Lf & ControlChars.Tab &
 CType(fileIOPerm3, FileIOPermission).GetPathList(FileIOPermissionAccess.Read)(0)))
                    Else
                        Console.WriteLine(("The intersection of
 " & firstPermission & "  and "
 & secondPermission & " is null."))
                    End If
                Catch e As Exception
                    Console.WriteLine(("An exception was thrown
 for intersection " & e.ToString()))
                    returnValue = False
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While

        Return returnValue
    End Function 'IntersectDemo

    'Copy creates and returns an identical copy of the current permission.
    Private Function CopyDemo() As
 Boolean
        Dim returnValue As Boolean
 = True
        Dim fileIO1 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission
        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1)
            End If
            Console.WriteLine("**********************************************************"
 & ControlChars.Lf)
            fileIOGen2.ResetIndex()
            Try
                fileIOPerm2 = CType(fileIOPerm1.Copy(), FileIOPermission)
                If Not (fileIOPerm2 Is
 Nothing) Then
                    Console.WriteLine(("Result of copy = "
 & fileIOPerm2.ToString() & ControlChars.Lf))
                Else
                    Console.WriteLine("Result of copy is null.
 " & ControlChars.Lf)
                End If
            Catch e As Exception
                If (True.ToString()) Then
                    If fileIO1 = "" Then
                        Console.WriteLine("The target FileIOPermission
 is empty, copy failed.")

                    Else
                        Console.WriteLine(e.ToString())
                    End If
                End If
                GoTo ContinueWhile1
            End Try
ContinueWhile1:
        End While
        Return returnValue
    End Function 'CopyDemo

    ' ToXml creates an XML encoding of the permission and its current
 state; 
    ' FromXml reconstructs a permission with the specified state from
 the XML encoding. 
    Private Function ToFromXmlDemo() As
 Boolean

        Dim returnValue As Boolean
 = True

        Dim fileIO1 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission

        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1)
            End If
            Console.WriteLine("********************************************************"
 & ControlChars.Lf)
            fileIOGen2.ResetIndex()
            Try
                fileIOPerm2 = New FileIOPermission(PermissionState.None)
                fileIOPerm2.FromXml(fileIOPerm1.ToXml())
                Console.WriteLine(("Result of ToFromXml = "
 & fileIOPerm2.ToString() & ControlChars.Lf))

            Catch e As Exception
                Console.WriteLine(("ToFromXml failed :"
 & fileIOPerm1.ToString() & e.ToString()))
                GoTo ContinueWhile1
            End Try
ContinueWhile1:
        End While

        Return returnValue
    End Function 'ToFromXmlDemo

    ' AddPathList adds access for the specified files and directories
 to the existing state of the permission.
    ' SetPathList sets the specified access to the specified files and
 directories, replacing the existing state 
    ' of the permission.
    ' GetPathList gets all files and directories that have the specified
 FileIOPermissionAccess.
    Private Function SetGetPathListDemo() As
 Boolean
        Try
            Console.WriteLine("********************************************************"
 & ControlChars.Lf)

            Dim fileIOPerm1 As FileIOPermission
            Console.WriteLine("Creating a FileIOPermission with
 AllAccess rights for 'C:\Examples\Test\TestFile.txt")
            fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess,
 "C:\Examples\Test\TestFile.txt")
            Console.WriteLine("Adding 'C:\Temp' to the write access
 list, and " & ControlChars.Lf & " 'C:\Examples\Test' to read
 access.")
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\Temp")
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\Examples\Test")
            Dim paths As String()
 = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
            Console.WriteLine("Read access before SetPathList
 = ")
            Dim path As String
            For Each path In
 paths
                Console.WriteLine((ControlChars.Tab & path))
            Next path
            Console.WriteLine("Setting the read access list to
 " & ControlChars.Lf & "'C:\Temp'")
            fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\Temp")
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
            Console.WriteLine("Read access list after SetPathList
 = ")
            For Each path In
 paths
                Console.WriteLine((ControlChars.Tab & path))
            Next path

            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write)
            Console.WriteLine("Write access list after SetPathList
 = ")
            For Each path In
 paths
                Console.WriteLine((ControlChars.Tab & path))
            Next path

            Dim pathList() As String
            pathList = fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)

        Catch e As ArgumentException
            ' FileIOPermissionAccess.AllAccess can not be used as a
 parameter for GetPathList.
            Console.WriteLine(("An ArgumentException occurred
 as a result of using AllAccess. " & "This property
 cannot be used as a parameter in GetPathList " & "because it represents more than one type of file variable access. : "
 & ControlChars.Lf & e.ToString()))
        End Try

        Return True
    End Function 'SetGetPathListDemo

    ' The AllFiles property gets or sets the permitted access to all
 files.
    ' The AllLocalFiles property gets or sets the permitted access to
 all local files.
    Private Function AllFilesDemo() As
 Boolean
        Try
            Console.WriteLine("********************************************************"
 & ControlChars.Lf)

            Dim fileIOPerm1 As FileIOPermission
            Console.WriteLine("Creating a FileIOPermission and
 adding read access for all files")
            fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess,
 "C:\Examples\Test\TestFile.txt")
            fileIOPerm1.AllFiles = FileIOPermissionAccess.Read
            Console.WriteLine("AllFiles access = "
 & fileIOPerm1.AllFiles.ToString())
            Console.WriteLine("Adding AllAccess rights for local
 files.")
            fileIOPerm1.AllLocalFiles = FileIOPermissionAccess.AllAccess
            Console.WriteLine("AllLocalFiles access = "
 & fileIOPerm1.AllLocalFiles.ToString())

        Catch e As ArgumentException
            Console.WriteLine(e.ToString())
            Return False
        End Try

        Return True
    End Function 'AllFilesDemo

    ' Invoke all demos.
    Public Function RunDemo() As
 Boolean

        Dim ret As Boolean
 = True
        Dim retTmp As Boolean
        ' Call the IsSubsetOfPath demo.
        retTmp = IsSubsetOfDemo()
        If retTmp Then
            Console.Out.WriteLine("IsSubsetOf demo completed successfully.")
        Else
            Console.Out.WriteLine("IsSubsetOf demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the Union demo.
        retTmp = UnionDemo()
        If retTmp Then
            Console.Out.WriteLine("Union demo completed successfully.")
        Else
            Console.Out.WriteLine("Union demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the Intersect demo.    
        retTmp = IntersectDemo()
        If retTmp Then
            Console.Out.WriteLine("Intersect demo completed successfully.")
        Else
            Console.Out.WriteLine("Intersect demo failed.")
        End If
        ret = retTmp AndAlso ret


        ' Call the Copy demo.
        retTmp = CopyDemo()
        If retTmp Then
            Console.Out.WriteLine("Copy demo completed successfully.")
        Else
            Console.Out.WriteLine("Copy demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the ToFromXml demo.    
        retTmp = ToFromXmlDemo()
        If retTmp Then
            Console.Out.WriteLine("ToFromXml demo completed successfully.")
        Else
            Console.Out.WriteLine("ToFromXml demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the SetGetPathList demo.    
        retTmp = SetGetPathListDemo()
        If retTmp Then
            Console.Out.WriteLine("SetGetPathList demo completed
 successfully.")
        Else
            Console.Out.WriteLine("SetGetPathList demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the AllFiles demo.    
        retTmp = AllFilesDemo()
        If retTmp Then
            Console.Out.WriteLine("AllFiles demo completed successfully.")
        Else
            Console.Out.WriteLine("AllFiles demo failed.")
        End If
        ret = retTmp AndAlso ret

        Return ret
    End Function 'RunDemo

    ' Test harness.
    Public Overloads Shared
 Sub Main(ByVal args() As
 [String])
        Try
            Dim democase As New
 FileIOPermissionDemo()
            Dim ret As Boolean
 = democase.RunDemo()
            If ret Then
                Console.Out.WriteLine("FileIOPermission demo completed
 successfully.")
                Console.Out.WriteLine("Press the Enter key to
 exit.")
                Dim consoleInput As String
 = Console.ReadLine()
                System.Environment.ExitCode = 100
            Else
                Console.Out.WriteLine("FileIOPermission demo failed.")
                Console.Out.WriteLine("Press the Enter key to
 exit.")
                Dim consoleInput As String
 = Console.ReadLine()
                System.Environment.ExitCode = 101
            End If
        Catch e As Exception
            Console.Out.WriteLine("FileIOPermission demo failed")
            Console.WriteLine(e.ToString())
            Console.Out.WriteLine("Press the Enter key to exit.")
            Dim consoleInput As String
 = Console.ReadLine()
            System.Environment.ExitCode = 101
        End Try
    End Sub 'Main
End Class 'FileIOPermissionDemo


' This class generates FileIOPermission objects.

Friend Class FileIOGenerator


    Private myFile As String()
 = {"C:\Examples\Test\TestFile.txt", "C:\Examples\Test\",
 "C:\Examples\Test\..", "C:\Temp"}

    Private myAccess As FileIOPermissionAccess()
 = {FileIOPermissionAccess.AllAccess, FileIOPermissionAccess.Append, FileIOPermissionAccess.NoAccess,
 FileIOPermissionAccess.PathDiscovery, FileIOPermissionAccess.Read, FileIOPermissionAccess.Write}

    Private fileIndex As Integer
 = 0


    Public Sub New()

        ResetIndex()
    End Sub 'New


    Public Sub ResetIndex()
        fileIndex = 0
    End Sub 'ResetIndex

    ' Create a file path.
    Public Function CreateFilePath(ByRef
 file As String) As Boolean

        If fileIndex = myFile.Length Then

            file = ""
            fileIndex &= 1
            Return True
        End If
        If fileIndex > myFile.Length Then
            file = ""
            Return False
        End If

        file = myFile(fileIndex)
        fileIndex = fileIndex + 1

        Try
            Return True
        Catch e As Exception
            Console.WriteLine(("Cannot create FileIOPermission:
 " & file & " " & e.ToString()))
            file = ""
            Return True
        End Try
    End Function
End Class

C#

using System;
using System.Security;
using System.Security.Permissions;
using System.Collections;

[assembly: CLSCompliant(true)]

public class FileIOPermissionDemo
{
    // IsSubsetOf determines whether the current permission is a subset
 of the specified permission.
    // This method compares various FileIOPermission paths with FileIOPermissionAccess
 set to AllAccess.
    private bool IsSubsetOfDemo()
    {

        bool returnValue = true;

        string fileIO1, fileIO2;
        FileIOPermission fileIOPerm1, fileIOPerm2;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath(out fileIO1 ))
        {
            if(fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess,
 fileIO1);

            Console.WriteLine("**********************************************************\n");

            fileIOGen2.ResetIndex();

            while (fileIOGen2.CreateFilePath(out fileIO2))
            {
                if (fileIO2 == "")
                    fileIOPerm2 = new FileIOPermission(PermissionState.None);
                else
                    fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.AllAccess,
 fileIO2);
                string firstPermission = fileIO1 == ""
 | fileIO1 == null ? "null" : fileIO1;
                string secondPermission = fileIO2 == ""
 | fileIO2 == null ? "null" : fileIO2;
                if (fileIOPerm2 == null) continue;
                try
                {
                    if (fileIOPerm1.IsSubsetOf(fileIOPerm2))
                    {

                        Console.WriteLine(firstPermission + " is a subset of
 " + secondPermission + "\n");
                    }
                    else
                    {
                        Console.WriteLine(firstPermission + " is not a subset
 of " + secondPermission + "\n");
                    }

                }
                catch (Exception e)
                {
                    Console.WriteLine("An exception was thrown for
 subset :" + fileIO1 == "" ? "null"
 : fileIO1 + "\n" +
                        fileIO2 == "" ? "null"
 : fileIO2 + "\n" + e);
                }
            }
        }
        return returnValue;
    }

    // Union creates a new permission that is the union of the current
 permission and the specified permission.
    private bool UnionDemo()
    {

        bool returnValue = true;

        string fileIO1, fileIO2;
        FileIOPermission fileIOPerm1, fileIOPerm2;
        IPermission fileIOPerm3;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath( out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1);
            if (fileIO1 == null) continue;

            Console.WriteLine("**********************************************************\n");
            fileIOGen2.ResetIndex();

            while (fileIOGen2.CreateFilePath( out fileIO2 ))
            {
                if (fileIO2 == "")
                    fileIOPerm2 = new FileIOPermission(PermissionState.None);
                else
                    fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO2);
                try
                {
                    string firstPermission = fileIO1 == ""
 | fileIO1 == null ? "null" : fileIO1;
                    string secondPermission = fileIO2 == ""
 | fileIO2 == null ? "null" : fileIO2;
                    fileIOPerm3 = (FileIOPermission)fileIOPerm1.Union(fileIOPerm2);
                    fileIOPerm3 = fileIOPerm1.Union(fileIOPerm2);

                    if (fileIOPerm3 == null)
                    {
                        Console.WriteLine("The union of " + firstPermission
 + " and " + secondPermission + " is null.");
                    }
                    else
                    {
                        Console.WriteLine("The union of " + firstPermission
 + " and " + secondPermission +
                            " = \n\t" + ((FileIOPermission)fileIOPerm3).GetPathList(FileIOPermissionAccess.Read)[0]);
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine("An exception was thrown for
 union " + e);
                    returnValue = false;
                }

            }

        }

        return returnValue;

    }

    // Intersect creates and returns a new permission that is the intersection
 of the current
    // permission and the permission specified.
    private bool IntersectDemo()
    {

        bool returnValue = true;

        string fileIO1, fileIO2;
        FileIOPermission fileIOPerm1, fileIOPerm2, fileIOPerm3;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath(out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1);

            Console.WriteLine("**********************************************************\n");
            fileIOGen2.ResetIndex();

            while (fileIOGen2.CreateFilePath( out fileIO2 ))
            {
                if (fileIO2 == "")
                    fileIOPerm2 = new FileIOPermission(PermissionState.None);
                else
                    fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO2);
                string firstPermission = fileIO1 == ""
 | fileIO1 == null ? "null" : fileIO1;
                string secondPermission = fileIO2 == ""
 | fileIO2 == null ? "null" : fileIO2;
                try
                {

                    fileIOPerm3 = (FileIOPermission)fileIOPerm1.Intersect(fileIOPerm2);
                    if (fileIOPerm3 != null
 && fileIOPerm3.GetPathList(FileIOPermissionAccess.Read) != null)
                    {

                        Console.WriteLine("The intersection of " + firstPermission
 + " and \n\t" + secondPermission +
                            " = \n\t" + ((FileIOPermission)fileIOPerm3).GetPathList(FileIOPermissionAccess.Read)[0]);
                    }
                    else
                    {
                        Console.WriteLine("The intersection of " + firstPermission
 + " and " + secondPermission + " is null.");
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine("An exception was thrown for
 intersection " + e);
                    returnValue = false;
                }
            }
        }

        return returnValue;

    }

    //Copy creates and returns an identical copy of the current permission.
    private bool CopyDemo()
    {
        bool returnValue = true;
        string fileIO1;
        FileIOPermission fileIOPerm1, fileIOPerm2;
        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath( out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1);

            Console.WriteLine("**********************************************************\n");
            fileIOGen2.ResetIndex();
            try
            {
                fileIOPerm2 = (FileIOPermission)fileIOPerm1.Copy();
                if (fileIOPerm2 != null)
                {
                    Console.WriteLine("Result of copy = " + fileIOPerm2.ToString()
 + "\n");
                }
                else
                {
                    Console.WriteLine("Result of copy is null.
 \n");
                }
            }
            catch (Exception e)
            {
                {
                    if (fileIO1 == "")
                    {
                        Console.WriteLine("The target FileIOPermission is empty,
 copy failed.");

                    }
                    else
                        Console.WriteLine(e);
                }
                continue;
            }
        }
        return returnValue;
    }

    // ToXml creates an XML encoding of the permission and its current
 state;
    // FromXml reconstructs a permission with the specified state from
 the XML encoding.
    private bool ToFromXmlDemo()
    {

        bool returnValue = true;

        string fileIO1;
        FileIOPermission fileIOPerm1, fileIOPerm2;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath( out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1);

            Console.WriteLine("********************************************************\n");
            fileIOGen2.ResetIndex();
            try
            {
                fileIOPerm2 = new FileIOPermission(PermissionState.None);
                fileIOPerm2.FromXml(fileIOPerm1.ToXml());
                Console.WriteLine("Result of ToFromXml = " + fileIOPerm2.ToString()
 + "\n");

            }
            catch (Exception e)
            {
                Console.WriteLine("ToFromXml failed :" + fileIOPerm1.ToString()
 + e);
                continue;
            }
        }

        return returnValue;

    }

    // AddPathList adds access for the specified files and directories
 to the existing state of the permission.
    // SetPathList sets the specified access to the specified files
 and directories, replacing the existing state
    // of the permission.
    // GetPathList gets all files and directories that have the specified
 FileIOPermissionAccess.
    private bool SetGetPathListDemo()
    {
        try
        {
            Console.WriteLine("********************************************************\n");

            FileIOPermission fileIOPerm1;
            Console.WriteLine("Creating a FileIOPermission with AllAccess rights
 for 'C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess,
 "C:\\Examples\\Test\\TestFile.txt");
            Console.WriteLine("Adding 'C:\\Temp' to the write access list, and
 \n 'C:\\Examples\\Test' to read access.");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\\Examples\\Test");
            string[] paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
            Console.WriteLine("Read access before SetPathList = ");
            foreach (string path in
 paths)
            {
                Console.WriteLine("\t" + path);
            }
            Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
            fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
            Console.WriteLine("Read access list after SetPathList = ");
            foreach (string path in
 paths)
            {
                Console.WriteLine("\t" + path);
            }

            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
            Console.WriteLine("Write access list after SetPathList = ");
            foreach (string path in
 paths)
            {
                Console.WriteLine("\t" + path);
            }

            Console.WriteLine("Write access = \n" +
                fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess));

        }
        catch (ArgumentException e)
        {
            // FileIOPermissionAccess.AllAccess can not be used as a
 parameter for GetPathList.
            Console.WriteLine("An ArgumentException occurred as a result of
 using AllAccess. "
                + "This property cannot be used as a parameter in
 GetPathList "
                + "because it represents more than one type of file variable
 access. : \n" + e);
        }

        return true;
    }

    // The AllFiles property gets or sets the permitted access to all
 files.
    // The AllLocalFiles property gets or sets the permitted access
 to all local files.
    private bool AllFilesDemo()
    {
        try
        {
            Console.WriteLine("********************************************************\n");

            FileIOPermission fileIOPerm1;
            Console.WriteLine("Creating a FileIOPermission and adding read access
 for all files");
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess,
 "C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1.AllFiles = FileIOPermissionAccess.Read;
            Console.WriteLine("AllFiles access = " + fileIOPerm1.AllFiles);
            Console.WriteLine("Adding AllAccess rights for
 local files.");
            fileIOPerm1.AllLocalFiles = FileIOPermissionAccess.AllAccess;
            Console.WriteLine("AllLocalFiles access = " + fileIOPerm1.AllLocalFiles);

        }
        catch (ArgumentException e)
        {
            Console.WriteLine(e);
            return false;
        }

        return true;
    }

    // Invoke all demos.
    public bool RunDemo()
    {

        bool ret = true;
        bool retTmp;
        // Call the IsSubsetOfPath demo.
        if (retTmp = IsSubsetOfDemo()) Console.Out.WriteLine("IsSubsetOf
 demo completed successfully.");
        else Console.Out.WriteLine("IsSubsetOf demo failed.");
        ret = retTmp && ret;

        // Call the Union demo.
        if (retTmp = UnionDemo()) Console.Out.WriteLine("Union
 demo completed successfully.");
        else Console.Out.WriteLine("Union demo failed.");
        ret = retTmp && ret;

        // Call the Intersect demo.
        if (retTmp = IntersectDemo()) Console.Out.WriteLine("Intersect
 demo completed successfully.");
        else Console.Out.WriteLine("Intersect demo failed.");
        ret = retTmp && ret;


        // Call the Copy demo.
        if (retTmp = CopyDemo()) Console.Out.WriteLine("Copy
 demo completed successfully.");
        else Console.Out.WriteLine("Copy demo failed.");
        ret = retTmp && ret;

        // Call the ToFromXml demo.
        if (retTmp = ToFromXmlDemo()) Console.Out.WriteLine("ToFromXml
 demo completed successfully.");
        else Console.Out.WriteLine("ToFromXml demo failed.");
        ret = retTmp && ret;

        // Call the SetGetPathList demo.
        if (retTmp = SetGetPathListDemo()) Console.Out.WriteLine("SetGetPathList
 demo completed successfully.");
        else Console.Out.WriteLine("SetGetPathList demo failed.");
        ret = retTmp && ret;

        // Call the AllFiles demo.
        if (retTmp = AllFilesDemo()) Console.Out.WriteLine("AllFiles
 demo completed successfully.");
        else Console.Out.WriteLine("AllFiles demo failed.");
        ret = retTmp && ret;

        return (ret);

    }
    // Test harness.
    public static void Main(String[]
 args)
    {
        try
        {
            FileIOPermissionDemo democase = new FileIOPermissionDemo();
            bool ret = democase.RunDemo();
            if (ret)
            {
                Console.Out.WriteLine("FileIOPermission demo completed successfully.");
                Console.Out.WriteLine("Press the Enter key to exit.");
                string consoleInput = Console.ReadLine();
                System.Environment.ExitCode = 100;
            }
            else
            {
                Console.Out.WriteLine("FileIOPermission demo failed.");
                Console.Out.WriteLine("Press the Enter key to exit.");
                string consoleInput = Console.ReadLine();
                System.Environment.ExitCode = 101;
            }
        }
        catch (Exception e)
        {
            Console.Out.WriteLine("FileIOPermission demo failed");
            Console.WriteLine(e.ToString());
            Console.Out.WriteLine("Press the Enter key to exit.");
            string consoleInput = Console.ReadLine();
            System.Environment.ExitCode = 101;
        }
    }
}


// This class generates FileIOPermission objects.

internal class FileIOGenerator
{


    private string[] myFile =
{
    "C:\\Examples\\Test\\TestFile.txt",
    "C:\\Examples\\Test\\",
    "C:\\Examples\\Test\\..",
    "C:\\Temp"
};

    private FileIOPermissionAccess[] myAccess =
{
    FileIOPermissionAccess.AllAccess,
    FileIOPermissionAccess.Append,
    FileIOPermissionAccess.NoAccess,
    FileIOPermissionAccess.PathDiscovery,
    FileIOPermissionAccess.Read,
    FileIOPermissionAccess.Write
};

    private int fileIndex = 0;

    public FileIOGenerator()
    {

        ResetIndex();
    }

    public void ResetIndex()
    {
        fileIndex = 0;
    }

    // Create a  file path string.
    public bool CreateFilePath( out string
 file )
    {

        if (fileIndex == myFile.Length)
        {

            file = "";
            fileIndex++;
            return true;

        }
        if (fileIndex > myFile.Length)
        {
            file = "";
            return false;
        }

        file = myFile[fileIndex++];

        try
        {
            return true;
        }
        catch (Exception e)
        {
            Console.WriteLine("Cannot create FileIOPermission: " + file
 + " " + e);
            file = "";
            return true;
        }
    }
}

C++

using namespace System::Runtime::InteropServices;
using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Collections;

// This class generates FileIOPermission objects.

[assembly:CLSCompliant(true)];
private ref class FileIOGenerator
{
private:
   array<String^>^myFile;
   array<FileIOPermissionAccess>^myAccess;
   int fileIndex;

public:
   FileIOGenerator()
   {
      array<String^>^tempFile = {"C:\\Examples\\Test\\TestFile.txt"
,"C:\\Examples\\Test\\","C:\\Examples\\Test\\..","C:\\Temp"};
      myFile = tempFile;
      array<FileIOPermissionAccess>^ tempAccess = {FileIOPermissionAccess::AllAccess
,FileIOPermissionAccess::Append,FileIOPermissionAccess::NoAccess,FileIOPermissionAccess::PathDiscovery
,FileIOPermissionAccess::Read,FileIOPermissionAccess::Write};
      myAccess = tempAccess;
      ResetIndex();
   }

   void ResetIndex()
   {
      fileIndex = 0;
   }


   // Create a file path.
   bool CreateFilePath(  [Out]interior_ptr<String^> file
 )
   {
      if ( fileIndex == myFile->Length )
      {
         
  
          *file = "";
         fileIndex++;
         return true;
      }

      if ( fileIndex > myFile->Length )
      {
          *file = "";
         return false;
      }

       *file = myFile[ fileIndex++ ];
      try
      {
         return true;
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "Cannot create FileIOPermission: {0} {1}",
  *file, e );
          *file = "";
         return true;
      }

   }

};

public ref class FileIOPermissionDemo
{
private:

   // IsSubsetOf determines whether the current permission is a subset
 of the specified permission.
   // This method compares various FileIOPermission paths with FileIOPermissionAccess
 set to AllAccess.
   bool IsSubsetOfDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      String^ fileIO2;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath(  &fileIO1 ) )
      {
          if (fileIO1 == "")
              fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::AllAccess,
 fileIO1);

         Console::WriteLine( "**********************************************************\n"
 );
         fileIOGen2->ResetIndex();
         while ( fileIOGen2->CreateFilePath( &fileIO2 )
 )
         {
            if (fileIO2 == "")
                fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
            else
              fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::AllAccess,
 fileIO2);
            String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr
 ? "null" : fileIO1;
            String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr
 ? "null" : fileIO2;
            if ( fileIOPerm2 == nullptr )
                        continue;
            try
            {
               if ( fileIOPerm1->IsSubsetOf( fileIOPerm2 )
 )
               {
                  Console::WriteLine( "{0} is a subset of {1}\n", firstPermission,
 secondPermission );
               }
               else
               {
                  Console::WriteLine( "{0} is not a subset of {1}\n", firstPermission,
 secondPermission );
               }
            }
            catch ( Exception^ e ) 
            {
               Console::WriteLine( "An exception was thrown for
 subset :{0}\n{1}\n{2}", (fileIO1->Equals( "" ) ? "null"
 : fileIO1), (fileIO2->Equals( "" ) ? "null" : fileIO2), e );
            }

         }
      }

      return returnValue;
   }


   // Union creates a new permission that is the union of the current
 permission and the specified permission.
   bool UnionDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      String^ fileIO2;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      IPermission^ fileIOPerm3;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath(  &fileIO1 ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read,
 fileIO1);

         Console::WriteLine( "**********************************************************\n"
 );
         fileIOGen2->ResetIndex();
         while ( fileIOGen2->CreateFilePath(  &fileIO2
 ) )
         {
             if (fileIO2 == "")
                 fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
            else
              fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::Read,
 fileIO2);
            try
            {
               if ( fileIOPerm2 == nullptr )
                              continue;
               String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr
 ? "null" : fileIO1;
               String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr
 ? "null" : fileIO2;
               fileIOPerm3 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Union(
 fileIOPerm2 ));
               fileIOPerm3 = fileIOPerm1->Union( fileIOPerm2 );
               if ( fileIOPerm3 == nullptr )
               {
                  Console::WriteLine( "The union of {0}  and {1} is null.",
 firstPermission, secondPermission );
               }
               else
               {
                  Console::WriteLine( "The union of {0}  and {1} = \n\t{2}",
 firstPermission, secondPermission, (dynamic_cast<FileIOPermission^>(fileIOPerm3))->GetPathList(
 FileIOPermissionAccess::Read )[ 0 ] );
               }
            }
            catch ( Exception^ e ) 
            {
               Console::WriteLine( "An exception was thrown for
 union {0}", e );
               returnValue = false;
            }

         }
      }

      return returnValue;
   }


   // Intersect creates and returns a new permission that is the intersection
 of the current 
   // permission and the permission specified.
   bool IntersectDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      String^ fileIO2;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOPermission^ fileIOPerm3;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath ( &fileIO1  )
 )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read,
 fileIO1);

         Console::WriteLine( "**********************************************************\n"
 );
         fileIOGen2->ResetIndex();
         while ( fileIOGen2->CreateFilePath( &fileIO2 
 ) )
         {
            if (fileIO2 == "")
                fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
            else
              fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::Read,
 fileIO2);
            String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr
 ? "null" : fileIO1;
            String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr
 ? "null" : fileIO2;
            try
            {
               fileIOPerm3 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Intersect(
 fileIOPerm2 ));
               if ( fileIOPerm3 != nullptr && fileIOPerm3->GetPathList(
 FileIOPermissionAccess::Read ) != nullptr )
               {
                  Console::WriteLine( "The intersection of {0}  and \n\t{1}
 = \n\t{2}", firstPermission, secondPermission, (dynamic_cast<FileIOPermission^>(fileIOPerm3))->GetPathList(
 FileIOPermissionAccess::Read )[ 0 ] );
               }
               else
               {
                  Console::WriteLine( "The intersection of {0}  and {1} is null.",
 firstPermission, secondPermission );
               }
            }
            catch ( Exception^ e ) 
            {
               Console::WriteLine( "An exception was thrown for
 intersection {0}", e );
               returnValue = false;
            }

         }
      }

      return returnValue;
   }


   //Copy creates and returns an identical copy of the current permission.
   bool CopyDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath( &fileIO1 ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read,
 fileIO1);

         Console::WriteLine( "**********************************************************\n"
 );
         fileIOGen2->ResetIndex();
         try
         {
            fileIOPerm2 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Copy());
            if ( fileIOPerm2 != nullptr )
            {
               Console::WriteLine( "Result of copy = {0}\n", fileIOPerm2
 );
            }
            else
            {
               Console::WriteLine( "Result of copy is null.
 \n" );
            }
         }
         catch ( Exception^ e ) 
         {
            {
               if ( fileIO1->Equals( "" ) )
               {
                  Console::WriteLine( "The target FileIOPermission is empty,
 copy failed." );
               }
               else
                              Console::WriteLine( e );
            }
            continue;
         }

      }

      return returnValue;
   }


   // ToXml creates an XML encoding of the permission and its current
 state; 
   // FromXml reconstructs a permission with the specified state from
 the XML encoding. 
   bool ToFromXmlDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath( &fileIO1 ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read,
 fileIO1);

         Console::WriteLine( "********************************************************\n"
 );
         fileIOGen2->ResetIndex();
         try
         {
            fileIOPerm2 = gcnew FileIOPermission( PermissionState::None );
            fileIOPerm2->FromXml( fileIOPerm1->ToXml() );
            Console::WriteLine( "Result of ToFromXml = {0}\n", fileIOPerm2
 );
         }
         catch ( Exception^ e ) 
         {
            Console::WriteLine( "ToFromXml failed :{0}{1}", fileIOPerm1,
 e );
            continue;
         }

      }

      return returnValue;
   }


   // AddPathList adds access for the specified files and directories
 to the existing state of the permission.
   // SetPathList sets the specified access to the specified files and
 directories, replacing the existing state 
   // of the permission.
   // GetPathList gets all files and directories that have the specified
 FileIOPermissionAccess.
   bool SetGetPathListDemo()
   {
      try
      {
         Console::WriteLine( "********************************************************\n"
 );
         FileIOPermission^ fileIOPerm1;
         Console::WriteLine( "Creating a FileIOPermission with AllAccess rights
 for 'C:\\Examples\\Test\\TestFile.txt" );
         
         fileIOPerm1 = gcnew FileIOPermission( FileIOPermissionAccess::AllAccess,"C:\\Examples\\Test\\TestFile.txt"
 );
         
         Console::WriteLine( "Adding 'C:\\Temp' to the write access list, and
 \n 'C:\\Examples\\Test' to read access." );
         fileIOPerm1->AddPathList( FileIOPermissionAccess::Write, "C:\\Temp"
 );
         fileIOPerm1->AddPathList( FileIOPermissionAccess::Read, "C:\\Examples\\Test"
 );
         array<String^>^paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read
 );
         Console::WriteLine( "Read access before SetPathList = " );
         IEnumerator^ myEnum = paths->GetEnumerator();
         while ( myEnum->MoveNext() )
         {
            String^ path = safe_cast<String^>(myEnum->Current);
            Console::WriteLine( "\t{0}", path );
         }

         Console::WriteLine( "Setting the read access list to \n'C:\\Temp'"
 );
         fileIOPerm1->SetPathList( FileIOPermissionAccess::Read, "C:\\Temp"
 );
         paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
         Console::WriteLine( "Read access list after SetPathList = " );
         IEnumerator^ myEnum1 = paths->GetEnumerator();
         while ( myEnum1->MoveNext() )
         {
            String^ path = safe_cast<String^>(myEnum1->Current);
            Console::WriteLine( "\t{0}", path );
         }

         paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Write );
         Console::WriteLine( "Write access list after SetPathList = " );
         IEnumerator^ myEnum2 = paths->GetEnumerator();
         while ( myEnum2->MoveNext() )
         {
            String^ path = safe_cast<String^>(myEnum2->Current);
            Console::WriteLine( "\t{0}", path );
         }

         Console::WriteLine( "Write access = \n{0}", fileIOPerm1->GetPathList(
 FileIOPermissionAccess::AllAccess ) );
      }
      catch ( ArgumentException^ e ) 
      {
         
         // FileIOPermissionAccess.AllAccess can not be used as a parameter
 for GetPathList.
         Console::WriteLine( "An ArgumentException occurred as a result of using
 AllAccess. This property cannot be used as a parameter in GetPathList
 because it represents more than one type of file variable access. : \n{0}", e );
      }

      return true;
   }


   // The AllFiles property gets or sets the permitted access to all
 files.
   // The AllLocalFiles property gets or sets the permitted access to
 all local files.
   bool AllFilesDemo()
   {
      try
      {
         Console::WriteLine( "********************************************************\n"
 );
         FileIOPermission^ fileIOPerm1;
         Console::WriteLine( "Creating a FileIOPermission and adding read access
 for all files" );
         fileIOPerm1 = gcnew FileIOPermission( FileIOPermissionAccess::AllAccess,"C:\\Examples\\Test\\TestFile.txt"
 );
         fileIOPerm1->AllFiles = FileIOPermissionAccess::Read;
         Console::WriteLine( "AllFiles access = {0}", fileIOPerm1->AllFiles
 );
         Console::WriteLine( "Adding AllAccess rights for
 local files." );
         fileIOPerm1->AllLocalFiles = FileIOPermissionAccess::AllAccess;
         Console::WriteLine( "AllLocalFiles access = {0}", fileIOPerm1->AllLocalFiles
 );
      }
      catch ( ArgumentException^ e ) 
      {
         Console::WriteLine( e );
         return false;
      }

      return true;
   }


public:

   // Invoke all demos.
   bool RunDemo()
   {
      bool ret = true;
      bool retTmp;
      
      // Call the IsSubsetOfPath demo.
      if ( retTmp = IsSubsetOfDemo() )
            Console::WriteLine( "IsSubsetOf demo completed successfully."
 );
      else
            Console::WriteLine( "IsSubsetOf demo failed." );

      ret = retTmp && ret;
      
      // Call the Union demo.
      if ( retTmp = UnionDemo() )
            Console::WriteLine( "Union demo completed successfully." );
      else
            Console::WriteLine( "Union demo failed." );

      ret = retTmp && ret;
      
      // Call the Intersect demo. 
      if ( retTmp = IntersectDemo() )
            Console::WriteLine( "Intersect demo completed successfully."
 );
      else
            Console::WriteLine( "Intersect demo failed." );

      ret = retTmp && ret;
      
      // Call the Copy demo. 
      if ( retTmp = CopyDemo() )
            Console::WriteLine( "Copy demo completed successfully." );
      else
            Console::WriteLine( "Copy demo failed." );

      ret = retTmp && ret;
      
      // Call the ToFromXml demo. 
      if ( retTmp = ToFromXmlDemo() )
            Console::WriteLine( "ToFromXml demo completed successfully."
 );
      else
            Console::WriteLine( "ToFromXml demo failed." );

      ret = retTmp && ret;
      
      // Call the SetGetPathList demo. 
      if ( retTmp = SetGetPathListDemo() )
            Console::WriteLine( "SetGetPathList demo completed successfully."
 );
      else
            Console::WriteLine( "SetGetPathList demo failed." );

      ret = retTmp && ret;
      
      // Call the AllFiles demo. 
      if ( retTmp = AllFilesDemo() )
            Console::WriteLine( "AllFiles demo completed successfully."
 );
      else
            Console::WriteLine( "AllFiles demo failed." );

      ret = retTmp && ret;
      return (ret);
   }

};


// Test harness.
int main()
{
   try
   {
      FileIOPermissionDemo^ democase = gcnew FileIOPermissionDemo;
      bool ret = democase->RunDemo();
      if ( ret )
      {
         Console::WriteLine( "FileIOPermission demo completed successfully."
 );
         Console::WriteLine( "Press the Enter key to exit." );
         Console::ReadLine();
         System::Environment::ExitCode = 100;
      }
      else
      {
         Console::WriteLine( "FileIOPermission demo failed." );
         Console::WriteLine( "Press the Enter key to exit." );
         Console::ReadLine();
         System::Environment::ExitCode = 101;
      }
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "FileIOPermission demo failed" );
      Console::WriteLine( e );
      Console::WriteLine( "Press the Enter key to exit." );
      Console::ReadLine();
      System::Environment::ExitCode = 101;
   }

}

J#

// This sample demonstrates the IsSubsetOf, Union, Intersect, Copy,
 
// ToXml, FromXml, GetPathList and SetPathList methods, and the 
// AllFiles and AllLocalFiles properties
// of the FileIOPermission class.

import System.*;
import System.Security.*;
import System.Security.Permissions.*;
import System.Collections.*;

/** @assembly CLSCompliant(true)
 */

public class FileIOPermissionDemo
{
    // IsSubsetOf determines whether the current permission is a 
    // subset of the specified permission.
    // This method compares various FileIOPermission paths with 
    // FileIOPermissionAccess set to AllAccess.
    private boolean IsSubsetOfDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1] ;
        String fileIO2[] = new String[1] ;
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1]
 ;
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1]
 ;
        
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1,
 
            FileIOPermissionAccess.AllAccess)) {
            if (fileIOPerm1[0] == null) {
                continue ;
            }         
            Console.WriteLine("***********************" 
                + "***********************************\n");
            fileIOGen2.ResetIndex();
            
            while(fileIOGen2.CreateFilePath(fileIOPerm2, fileIO2,
 
                FileIOPermissionAccess.AllAccess)) {
                String firstPermission = (fileIO1[0].equals("") == 
                    true | fileIO1[0] == null)
 ? "null" : fileIO1[0];
                String secondPermission = (fileIO2[0].equals("") == 
                    true | fileIO2[0] == null)
 ? "null" : fileIO2[0];
                if (fileIOPerm2[0] == null)
 {
                    continue ;
                }
                try {
                    if (fileIOPerm1[0].IsSubsetOf(fileIOPerm2[0]))
 {
                        Console.WriteLine((firstPermission 
                            + " is a subset of " 
                            + secondPermission + "\n"));
                    }
                    else {
                        Console.WriteLine((firstPermission 
                            + " is not a subset of " 
                            + secondPermission + "\n"));
                    }
                } 
                catch(System.Exception e) {
                    Console.WriteLine(("An exception was thrown for
 subset :" 
                        + ((fileIO1[0].equals("") == true)
 ? 
                        "null" : (fileIO1[0] + "\n"
 
                        + ((fileIO2[0].equals("") == true)
 ? 
                        "null" : fileIO2[0]) + "\n"
 + e))));
                }
            }
        }
        return returnValue ;
    } //IsSubsetOfDemo   

    // Union creates a new permission that is the union of the current
 
    // permission and the specified permission.
    private boolean UnionDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        String fileIO2[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
        
        IPermission fileIOPerm3;
        
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, 
            fileIO1, FileIOPermissionAccess.Read)) {
            if (fileIO1[0] == null) {
                continue ;
            }
            Console.WriteLine("*****************************" 
                + "*****************************\n");
            fileIOGen2.ResetIndex();
            
            while(fileIOGen2.CreateFilePath(fileIOPerm2, 
                fileIO2, FileIOPermissionAccess.Read)) {
                try {
                    if (fileIOPerm2[0] == null)
 {
                        continue ;
                    }
                    
                    String firstPermission = (fileIO1[0].equals("")==
                        true | fileIO1[0] == null)
 ? "null" : fileIO1[0];
                    String secondPermission = (fileIO2[0].equals("") ==
 
                        true | fileIO2[0] == null)
 ? "null" : fileIO2[0];
                    fileIOPerm3 =((FileIOPermission)(fileIOPerm1[0].
                        Union(fileIOPerm2[0])));
                    fileIOPerm3 = fileIOPerm1[0].Union(fileIOPerm2[0]);
                    
                    if (fileIOPerm3 == null)
 {
                        Console.WriteLine(("The union of " 
                            + firstPermission + " and " 
                            + secondPermission 
                            + " is null."));
                    }
                    else {
                        Console.WriteLine(("The union of " + firstPermission
 
                            + " and " + secondPermission + " = \n\t"
 
                            + ((FileIOPermission)(fileIOPerm3)).
                            GetPathList(FileIOPermissionAccess.Read).
                            get_Item( 0)));
                    }
                }
                catch(System.Exception e) {
                    Console.WriteLine(("An exception was " 
                        + "thrown for union " + e));
                    returnValue = false;
                }
            }
        }
        return returnValue ;
    } //UnionDemo    

    // Intersect creates and returns a new permission that is 
    // the intersection of the current
    // permission and the permission specified.
    private boolean IntersectDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        String fileIO2[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm3;
        
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1,
 
            FileIOPermissionAccess.Read)) {
            if (fileIO1[0] == null) {
                continue ;
            }
            Console.WriteLine("***************************" 
                + "*******************************\n");
            fileIOGen2.ResetIndex();
            
            while(fileIOGen2.CreateFilePath(fileIOPerm2, fileIO2,
 
                FileIOPermissionAccess.Read)) {
                if ( fileIOPerm2[0] == null
  ) {
                    continue ;
                }
                String firstPermission = (fileIO1[0].equals("") == 
                    true | fileIO1[0] == null)
 ? "null" : fileIO1[0];
                String secondPermission = (fileIO2[0].equals("") == 
                    true | fileIO2[0] == null)
 ? "null" : fileIO2[0];
                try {
                    fileIOPerm3 =((FileIOPermission)(fileIOPerm1[0].
                    Intersect(fileIOPerm2[0])));
                    if (fileIOPerm3  != null
 && 
                        fileIOPerm3.GetPathList(FileIOPermissionAccess.Read)
                        != null) {
                        Console.WriteLine(("The intersection of " 
                            + firstPermission + " and \n\t" 
                            + secondPermission + " = \n\t" 
                            + ((FileIOPermission)(fileIOPerm3)).
                            GetPathList(FileIOPermissionAccess.Read).
                            get_Item( 0)));
                    }
                    else {
                        Console.WriteLine(("The intersection of " 
                            + firstPermission + " and " 
                            + secondPermission + " is null."));
                    }
                }
                catch(System.Exception e) {
                    Console.WriteLine(("An exception was " 
                        + "thrown for intersection "
 + e));
                        returnValue = false;
                }
            }
        }
        return returnValue ;
    } //IntersectDemo    

    //Copy creates and returns an identical copy of the current permission.
    private boolean CopyDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1,
 
            FileIOPermissionAccess.Read)) {
                if (fileIO1 == null) {
                    continue ;
                }
                Console.WriteLine("**********************************"
 
                + "************************\n");
                fileIOGen2.ResetIndex();
                try {
                    fileIOPerm2[0] =((FileIOPermission)(fileIOPerm1[0].Copy()));
                    if (fileIOPerm2[0]  != null)
 {
                        Console.WriteLine(("Result of copy = " 
                        + fileIOPerm2[0].ToString() + "\n"));
                    }
                    else {
                        Console.WriteLine("Result of copy is null.
 \n");
                    }
                }
                catch(System.Exception e) {
                    if (fileIO1[0].Equals("")) {
                        Console.WriteLine("The target FileIOPermission "
 
                            + "is empty, copy failed.");
                    }
                    else {
                        Console.WriteLine(e);
                    }
                }
                continue ;
            }
        return returnValue ;
    } //CopyDemo   

    // ToXml creates an XML encoding of the permission and its current
 state;
    // FromXml reconstructs a permission with the specified state from
 the XML
    // encoding.
    private boolean ToFromXmlDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];

        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1,
 
            FileIOPermissionAccess.Read)) {
            if (fileIOPerm1[0] == null) {
                continue ;
            }
            Console.WriteLine("**********************************" 
                + "**********************\n");
            fileIOGen2.ResetIndex();
            try {
                fileIOPerm2[0] = new FileIOPermission(PermissionState.None);
                fileIOPerm2[0].FromXml(fileIOPerm1[0].ToXml());
                Console.WriteLine(("Result of ToFromXml = " 
                    + fileIOPerm2[0].ToString() + "\n"));
            } 
            catch(System.Exception  e) {
                Console.WriteLine(("ToFromXml failed :" 
                    + fileIOPerm1[0].ToString() + e));
                continue ;
            }
        }
        return returnValue ;
    } //ToFromXmlDemo    

    // AllAccess
    // AddPathList adds access for the specified files and directories
 to the 
    // existing state of the permission.
    // SetPathList sets the specified access to the specified files
 and 
    // directories, replacing the existing state of the permission.
    // GetPathList gets all files and directories that have the specified
 
    // FileIOPermissionAccess.
    private boolean SetGetPathListDemo() 
    {
        try {
            Console.WriteLine("****************************" 
                + "****************************\n");
            FileIOPermission fileIOPerm1;
            
            Console.WriteLine("Creating a FileIOPermission with AllAccess "
 
                + "rights for 'C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1 = new FileIOPermission(
                FileIOPermissionAccess.AllAccess, 
                "C:\\Examples\\Test\\TestFile.txt");

            Console.WriteLine("Adding 'C:\\Temp' to the write access "
 
                + "list, and \n " +    "'C:\\Examples\\Test' to read
 access.");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, 
                "C:\\Examples\\Test");
            String paths[] = fileIOPerm1.GetPathList(
                FileIOPermissionAccess.Read);
            Console.WriteLine("Read access before SetPathList = ");
            for (int iCtr = 0; iCtr < paths.length;
 iCtr++) {
                String path = paths[iCtr];
                Console.WriteLine(("\t" + path));
            }

            Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
            fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
            Console.WriteLine("Read access list after SetPathList = ");
            for (int iCtr = 0; iCtr < paths.length;
 iCtr++) {
                String path = paths[iCtr];
                Console.WriteLine(("\t" + path));
            }            
            
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
            Console.WriteLine("Write access list after SetPathList = ");
            for (int iCtr = 0; iCtr < paths.length;
 iCtr++) {
                String path = paths[iCtr];
                Console.WriteLine(("\t" + path));
            }            
            Console.WriteLine(("Write access = \n" 
                + fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)));
        }
        catch(ArgumentException e){
            // FileIOPermissionAccess.AllAccess can not be used as a
 
            // parameter for GetPathList.
            Console.WriteLine(("An ArgumentException occurred as a result "
 
                + "of using AllAccess. " + "This
 property cannot be used as a " 
                + "parameter in GetPathList " 
                + "because it represents more than one type of " 
                + "file variable access. : \n" + e));
        }
        return true ;
    } //SetGetPathListDemo   

    // The AllFiles property gets or sets the permitted access to all
 files.
    // The AllLocalFiles property gets or sets the permitted access
 to 
    // all local files.
    private boolean AllFilesDemo() 
    {
        try {
            Console.WriteLine("***************************************"
 
                + "*****************\n");
            
            FileIOPermission fileIOPerm1;
            Console.WriteLine("Creating a FileIOPermission and adding "
 
                + "read access for all files");
            fileIOPerm1 = new FileIOPermission(
                FileIOPermissionAccess.AllAccess, 
                "C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1.set_AllFiles ( FileIOPermissionAccess.Read);
            Console.WriteLine(("AllFiles access = " 
                + fileIOPerm1.get_AllFiles()));
            Console.WriteLine("Adding AllAccess rights for
 local files.");
            fileIOPerm1.set_AllLocalFiles (FileIOPermissionAccess.AllAccess);
            Console.WriteLine(("AllLocalFiles access = " 
                + fileIOPerm1.get_AllLocalFiles()));
        } 
        catch(ArgumentException e) {
            Console.WriteLine(e);
            return false ;
        }
        return true ;
    } //AllFilesDemo

    // Invoke all demos.
    public boolean RunDemo() 
    {
        boolean ret = true;
        boolean retTmp;
        // Call the IsSubsetOfPath demo.
        if (retTmp = IsSubsetOfDemo()) {
            Console.get_Out().WriteLine("IsSubsetOf demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("IsSubsetOf demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the Union demo.
        if (retTmp = UnionDemo()) {
            Console.get_Out().WriteLine("Union demo completed successfully.");
        }
        else {
            Console.get_Out().WriteLine("Union demo failed.");
        }
        ret = retTmp && ret;
        // Call the Intersect demo.
        if (retTmp = IntersectDemo()) {
            Console.get_Out().WriteLine("Intersect demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("Intersect demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the Copy demo.
        if (retTmp = CopyDemo()) {
            Console.get_Out().WriteLine("Copy demo completed successfully.");
        }
        else {
            Console.get_Out().WriteLine("Copy demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the ToFromXml demo.
        if (retTmp = ToFromXmlDemo()) {
            Console.get_Out().WriteLine("ToFromXml demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("ToFromXml demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the SetGetPathList demo.
        if (retTmp = SetGetPathListDemo()) {
            Console.get_Out().WriteLine("SetGetPathList demo completed "
 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("SetGetPathList demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the AllFiles demo.
        if (retTmp = AllFilesDemo()) {
            Console.get_Out().WriteLine("AllFiles demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("AllFiles demo failed.");
        }
        ret = retTmp && ret;      
        return ret ;
    } //RunDemo

    // Test harness.
    public static void main(String[]
 args)
    {
        try {
            FileIOPermissionDemo democase =  new FileIOPermissionDemo();
            boolean ret = democase.RunDemo();
            if (ret) {
                Console.get_Out().WriteLine("FileIOPermission demo " 
                    + "completed successfully.");
                Console.get_Out().WriteLine("Press the Enter key to exit.");
                String consoleInput = Console.ReadLine();
                System.Environment.set_ExitCode(100);
            }
            else {
                Console.get_Out().WriteLine("FileIOPermission demo failed.");
                Console.get_Out().WriteLine("Press the Enter key to exit.");
                String consoleInput = Console.ReadLine();
                System.Environment.set_ExitCode(101);
            }
        }
        catch(System.Exception e) {
            Console.get_Out().WriteLine("FileIOPermission demo failed");
            Console.WriteLine(e.ToString());
            Console.get_Out().WriteLine("Press the Enter key to exit.");
            String consoleInput = Console.ReadLine();
            System.Environment.set_ExitCode(101);
        }
    } //main
} //FileIOPermissionDemo

// This class generates FileIOPermission objects.
class FileIOGenerator
{
    private String myFile[] =  {"C:\\Examples\\Test\\TestFile.txt",
 
        "C:\\Examples\\Test\\", "C:\\Examples\\Test\\..", "C:\\Temp"};
   
    private FileIOPermissionAccess myAccess[] = {
        FileIOPermissionAccess.AllAccess, 
        FileIOPermissionAccess.Append, 
        FileIOPermissionAccess.NoAccess, 
        FileIOPermissionAccess.PathDiscovery, 
        FileIOPermissionAccess.Read, 
        FileIOPermissionAccess.Write};   
    
    private int fileIndex = 0;

    public FileIOGenerator() 
    {
        ResetIndex();
    } //FileIOGenerator

    public void ResetIndex() 
    {
        fileIndex = 0;
    } //ResetIndex   

    // Create a FileIOPermission using FileIOPermissionAccess 
    // that is passed in.
    public boolean CreateFilePath(FileIOPermission fileIOPerm[],
 String file[], 
        FileIOPermissionAccess fpa) 
    {
        if (fileIndex == myFile.length) {
            fileIOPerm[0] = new FileIOPermission(PermissionState.None);

            file[0] = "";
            fileIndex++;
            return true ;
        }
        if (fileIndex > myFile.length) {
            fileIOPerm[0] = null;
            file[0] = "";
            return false ;
        }
        file[0] = myFile[fileIndex++];
        
        try {
            fileIOPerm[0] = new FileIOPermission(fpa, file[0]);
            return true ;
        }
        catch(System.Exception e) {
            Console.WriteLine(("Cannot create FileIOPermission: " 
                + file[0] + " " + e));
            fileIOPerm[0] = new FileIOPermission(PermissionState.None);
            file[0] = "";
            return true ;
        }
    } //CreateFilePath
} //FileIOGenerator 

継承階層

System.Object
   System.Security.CodeAccessPermission
    System.Security.Permissions.FileIOPermission

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
FileIOPermission メンバ
System.Security.Permissions 名前空間
FileIOPermissionAccess
FileIOPermissionAttribute
その他の技術情報
アクセス許可
アクセス許可の要求