FileIOPermission.IsSubsetOf メソッド

.NET Framework クラス ライブラリ リファレンス

FileIOPermission.IsSubsetOf メソッド

現在のアクセス許可が、指定したアクセス許可のサブセットかどうかを判断します。

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

Visual Basic (宣言)

Public Overrides Function
 IsSubsetOf ( _
    target As IPermission _
) As Boolean

Visual Basic (使用法)

Dim instance As FileIOPermission
Dim target As IPermission
Dim returnValue As Boolean

returnValue = instance.IsSubsetOf(target)

C#

public override bool IsSubsetOf (
    IPermission target
)

C++

public:
virtual bool IsSubsetOf (
    IPermission^ target
) override

J#

public boolean IsSubsetOf (
    IPermission target
)

JScript

public override function IsSubsetOf (
    target : IPermission
) : boolean

パラメータ

target

サブセットの関係を調べる対象のアクセス許可。このアクセス許可は、現在のアクセス許可と同じ型であることが必要です。

戻り値
現在のアクセス許可が、指定したアクセス許可のサブセットである場合は true。それ以外の場合は false。

例外

例外の種類	条件
ArgumentException	target パラメータが null 参照 (Visual Basic では Nothing) ではなく、現在のアクセス許可と同じ型でもありません。

解説

現在のアクセス許可で指定される操作の集合が、指定したアクセス許可に含まれる場合、現在のアクセス許可は指定したアクセス許可のサブセットです。たとえば、C:\example.txt への読み取りアクセス権を表すアクセス許可は、C:\ への読み取りアクセス権を表すアクセス許可のサブセットです。このメソッドが true を返す場合、現在のアクセス許可が保護されたリソースに対して表すアクセス権は、指定したアクセス許可が表すアクセス権と同じか、またはそのサブセットです

使用例

Visual Basic

    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

C#

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;
}

C++

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;
}

J#

// 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   

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 クラス
FileIOPermission メンバ
System.Security.Permissions 名前空間