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。

Overrides Public Function IsSubsetOf( _
   ByVal target As IPermission _) As Boolean Implements IPermission.IsSubsetOf
[C#]
public override bool IsSubsetOf(IPermissiontarget);
[C++]
public: bool 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 。

実装

IPermission.IsSubsetOf

例外

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

 
' 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, fileIO2 As String
    Dim fileIOPerm1, fileIOPerm2 As FileIOPermission

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

    fileIOGen1.ResetIndex()
    While fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, FileIOPermissionAccess.AllAccess)
        If fileIOPerm1 Is Nothing Then
            GoTo ContinueWhile1
        End If
        Console.WriteLine("**********************************************************" & ControlChars.Lf)

        fileIOGen2.ResetIndex()

        While fileIOGen2.CreateFilePath(fileIOPerm2, fileIO2, FileIOPermissionAccess.AllAccess)
            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#] 
// 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 fileIOPerm1, out fileIO1, FileIOPermissionAccess.AllAccess)) 
        {
            if(fileIOPerm1 == null) continue;

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

            fileIOGen2.ResetIndex();

            while(fileIOGen2.CreateFilePath(out fileIOPerm2, out fileIO2, FileIOPermissionAccess.AllAccess)) 
            {
                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++] 
// 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;
    String* fileIO2;

    FileIOPermission* fileIOPerm1;
    FileIOPermission* fileIOPerm2;


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

    fileIOGen1->ResetIndex();
    while(fileIOGen1->CreateFilePath(&fileIOPerm1, &fileIO1, FileIOPermissionAccess::AllAccess)) 
    {
        if(fileIOPerm1 == 0) continue;

        Console::WriteLine(S"**********************************************************\n");

        fileIOGen2->ResetIndex();

        while(fileIOGen2->CreateFilePath(&fileIOPerm2, &fileIO2, FileIOPermissionAccess::AllAccess)) 
        {
            String* firstPermission = fileIO1->Equals(S"") | fileIO1->Equals((String*)0) ? S"null" : fileIO1 ;
            String* secondPermission = fileIO2->Equals(S"") | fileIO2->Equals((String*)0) ? S"null" : fileIO2;
            if(fileIOPerm2 == 0) continue;
            try
            {            
                if (fileIOPerm1->IsSubsetOf(fileIOPerm2))
                {

                    Console::WriteLine(S"{0} is a subset of {1}\n", firstPermission, secondPermission);
                }
                else
                {
                    Console::WriteLine(S"{0} is not a subset of {1}\n", firstPermission, secondPermission);
                }

            }
            catch(Exception* e) 
            {
                Console::WriteLine(S"An exception was thrown for subset :{0}\n{1}\n{2}",
                    (fileIO1->Equals(S"")?S"null":fileIO1), (fileIO2->Equals(S"")?S"null":fileIO2), e);
            }
        }
    }
    return returnValue;
}

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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, Common Language Infrastructure (CLI) Standard

参照

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