FileDialogPermission.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。

Overrides Public Function Union( _
   ByVal target As IPermission _) As IPermission Implements IPermission.Union
[C#]
public override IPermission Union(IPermissiontarget);
[C++]
public: IPermission* Union(IPermission* target);
[JScript]
public override function Union(
   target : IPermission) : IPermission;

パラメータ

• target
  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。

実装

IPermission.Union

例外

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

 
' 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 fileDialog1, fileDialog2 As FileDialogPermissionAccess
    Dim fileDialogIdPerm1, fileDialogIdPerm2 As FileDialogPermission
    Dim fileDialogIdPerm3 As IPermission
    Dim fileDialogGen1 As New FileDialogGenerator()
    Dim fileDialogGen2 As New FileDialogGenerator()
    fileDialogGen1.ResetIndex()
    While fileDialogGen1.CreateFileDialog(fileDialogIdPerm1, fileDialog1)
        If fileDialogIdPerm1 Is Nothing Then
            GoTo ContinueWhile1
        End If
        Console.WriteLine("**********************************************************" & ControlChars.Lf)
        fileDialogGen2.ResetIndex()

        While fileDialogGen2.CreateFileDialog(fileDialogIdPerm2, fileDialog2)
            If fileDialogIdPerm2 Is Nothing Then
                GoTo ContinueWhile2
            End If
            fileDialogIdPerm3 = CType(fileDialogIdPerm1.Union(fileDialogIdPerm2), FileDialogPermission)
            fileDialogIdPerm3 = fileDialogIdPerm1.Union(fileDialogIdPerm2)

            If fileDialogIdPerm3 Is Nothing Then
                Console.WriteLine(("The union of " & fileDialog1.ToString() & " and " & fileDialog2.ToString() & " is null."))
            Else
                Console.WriteLine(("The union of " & fileDialogIdPerm1.Access.ToString() & " and " & fileDialogIdPerm2.Access.ToString() & " = " & CType(fileDialogIdPerm3, FileDialogPermission).Access.ToString()))
            End If
ContinueWhile2:
        End While
ContinueWhile1:
    End While


    Return returnValue
End Function 'UnionDemo


[C#] 
// Union creates a new permission that is the union of the current permission and the 
// specified permission.
    private bool UnionDemo()
    {
        bool returnValue = true;
        FileDialogPermissionAccess fileDialog1,fileDialog2;
        FileDialogPermission fileDialogIdPerm1,fileDialogIdPerm2;
        IPermission fileDialogIdPerm3;
        FileDialogGenerator fileDialogGen1 = new FileDialogGenerator();
        FileDialogGenerator fileDialogGen2 = new FileDialogGenerator();
        fileDialogGen1.ResetIndex();
        while(fileDialogGen1.CreateFileDialog(out fileDialogIdPerm1, out fileDialog1)) 
        {
            if(fileDialogIdPerm1 == null) continue;
            Console.WriteLine("**********************************************************\n");
            fileDialogGen2.ResetIndex();

            while(fileDialogGen2.CreateFileDialog(out fileDialogIdPerm2, out fileDialog2)) 
            {
                if(fileDialogIdPerm2 == null) continue;
                fileDialogIdPerm3 = (FileDialogPermission)fileDialogIdPerm1.Union(fileDialogIdPerm2);
                fileDialogIdPerm3 = fileDialogIdPerm1.Union(fileDialogIdPerm2);

                if(fileDialogIdPerm3 == null)  
                {
                    Console.WriteLine("The union of " +  fileDialog1 + " and " + fileDialog2 + " is null." );
                }
                else
                {
                    Console.WriteLine("The union of " + fileDialogIdPerm1.Access + " and " + 
                        fileDialogIdPerm2.Access + " = " + 
                        ((FileDialogPermission)fileDialogIdPerm3).Access.ToString());
                }

            }
        }

        return returnValue;

    }

[C++] 
// Union creates a new permission that is the union of the current permission and the 
// specified permission.
private:
bool UnionDemo()
{
   bool returnValue = true;
   FileDialogPermissionAccess fileDialog1,fileDialog2;
   FileDialogPermission* fileDialogIdPerm1;
   FileDialogPermission* fileDialogIdPerm2;

   IPermission* fileDialogIdPerm3;
   FileDialogGenerator* fileDialogGen1 = new FileDialogGenerator();
   FileDialogGenerator* fileDialogGen2 = new FileDialogGenerator();
   fileDialogGen1->ResetIndex();
   while(fileDialogGen1->CreateFileDialog(&fileDialogIdPerm1, &fileDialog1)) 
   {
      if(fileDialogIdPerm1 == 0) continue;
      Console::WriteLine(S"**********************************************************\n");
      fileDialogGen2->ResetIndex();

      while(fileDialogGen2->CreateFileDialog(&fileDialogIdPerm2, &fileDialog2)) 
      {
         if(fileDialogIdPerm2 == 0) continue;
         fileDialogIdPerm3 = dynamic_cast<FileDialogPermission*>(fileDialogIdPerm1->Union(fileDialogIdPerm2));
         fileDialogIdPerm3 = fileDialogIdPerm1->Union(fileDialogIdPerm2);

         if(fileDialogIdPerm3 == 0)  
         {
            Console::WriteLine(S"The union of {0} and {1} is null.", __box(fileDialog1), __box(fileDialog2));
         }
         else
         {
            Console::WriteLine(S"The union of {0} and {1} = {2}", __box(fileDialogIdPerm1->Access), __box(fileDialogIdPerm2->Access), __box((dynamic_cast<FileDialogPermission*>(fileDialogIdPerm3))->Access));
         }

      }
   }

   return returnValue;

}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

参照

FileDialogPermission クラス | FileDialogPermission メンバ | System.Security.Permissions 名前空間