FileIOPermission.Union メソッド

.NET Framework クラス ライブラリ リファレンス

FileIOPermission.Union メソッド

現在のアクセス許可と指定したアクセス許可の和集合を表すアクセス許可を作成します。

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
 Union ( _
    other As IPermission _
) As IPermission

Visual Basic (使用法)

Dim instance As FileIOPermission
Dim other As IPermission
Dim returnValue As IPermission

returnValue = instance.Union(other)

C#

public override IPermission Union (
    IPermission other
)

C++

public:
virtual IPermission^ Union (
    IPermission^ other
) override

J#

public IPermission Union (
    IPermission other
)

JScript

public override function Union (
    other : IPermission
) : IPermission

パラメータ

other

現在のアクセス許可と和集合を持つアクセス許可。これは、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と指定したアクセス許可の和集合を表す新しいアクセス許可。

例外

例外の種類	条件
ArgumentException	other 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

Union を呼び出すと、現在のアクセス許可と指定したアクセス許可の両方が表す操作をすべて表すアクセス許可が作成されます。いずれかのアクセス許可を要求し、その要求が満たされた場合、両者の和集合を表すアクセス許可に対する要求も満たされます。

使用例

Visual Basic

    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

C#

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;

}

C++

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;
}

J#

// 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    

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