SecurityPermission.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必要があります。

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完全に含まれる場合、現在のアクセス許可オブジェクトは指定したアクセス許可オブジェクトのサブセットです。たとえば、C:\example.txt へのアクセス権を表すアクセス許可は、C:\ への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は、保護されたリソースに対するアクセス権を指定したアクセス許可と同じにしか表しません。

使用例

 
' IsSubsetOf determines whether the current permission is a subset of the specified permission.
Private Function IsSubsetOfDemo() As Boolean
    Dim returnValue As Boolean = True
    Dim Security1, Security2 As SecurityPermissionFlag
    Dim SecurityPerm1, SecurityPerm2 As SecurityPermission
    Dim SecurityGen1 As New SecurityGenerator()
    Dim SecurityGen2 As New SecurityGenerator()
    SecurityGen1.ResetIndex()
    While SecurityGen1.CreateSecurity(SecurityPerm1, Security1)
        If SecurityPerm1 Is Nothing Then
            GoTo ContinueWhile1
        End If
        SecurityGen2.ResetIndex()
        Console.WriteLine("********************************************************" & ControlChars.Lf)

        While SecurityGen2.CreateSecurity(SecurityPerm2, Security2)
            If SecurityPerm2 Is Nothing Then
                GoTo ContinueWhile2
            End If
            Try
                If SecurityPerm1.IsSubsetOf(SecurityPerm2) Then
                    Console.WriteLine((SecurityPerm1.Flags.ToString().ToString() _
                    & " is a subset of " & SecurityPerm2.Flags.ToString()))
                Else
                    Console.WriteLine((SecurityPerm1.Flags.ToString() & " is not a subset of " _
                    & SecurityPerm2.Flags.ToString()))
                End If
            Catch e As Exception
                Console.WriteLine(("An exception was thrown for subset :" & SecurityPerm1.ToString() _
                & ControlChars.Lf & SecurityPerm2.ToString() & ControlChars.Lf & e.ToString()))
                returnValue = False
            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.
private bool IsSubsetOfDemo()
{
    bool returnValue = true;
    SecurityPermissionFlag Security1,Security2;
    SecurityPermission SecurityPerm1,SecurityPerm2;
    SecurityGenerator SecurityGen1 = new SecurityGenerator();
    SecurityGenerator SecurityGen2 = new SecurityGenerator();
    SecurityGen1.ResetIndex();
    while(SecurityGen1.CreateSecurity(out SecurityPerm1, out Security1)) 
    {
        if(SecurityPerm1 == null) continue;
        SecurityGen2.ResetIndex();
        Console.WriteLine("********************************************************\n");

        while(SecurityGen2.CreateSecurity(out SecurityPerm2, out Security2)) 
        {
            if(SecurityPerm2 == null) continue;
            try
            {            
                if (SecurityPerm1.IsSubsetOf(SecurityPerm2))
                {
                    Console.WriteLine(SecurityPerm1.Flags + " is a subset of " + 
                        SecurityPerm2.Flags);
                }
                else
                {
                    Console.WriteLine(SecurityPerm1.Flags + " is not a subset of " + 
                        SecurityPerm2.Flags);
                }
            }
            catch(Exception e) 
            {
                Console.WriteLine("An exception was thrown for subset :" + SecurityPerm1 + "\n" + 
                    SecurityPerm2 +"\n" + e);
                returnValue=false;
            }
        }
    }
    return returnValue;
}

[C++] 
// IsSubsetOf determines whether the current permission is a subset of the specified permission.
private:
bool IsSubsetOfDemo()
{
    bool returnValue = true;
    SecurityPermissionFlag Security1,Security2;
    SecurityPermission* SecurityPerm1;
    SecurityPermission* SecurityPerm2;
    SecurityGenerator* SecurityGen1 = new SecurityGenerator();
    SecurityGenerator* SecurityGen2 = new SecurityGenerator();
    SecurityGen1->ResetIndex();
    while(SecurityGen1->CreateSecurity(&SecurityPerm1, &Security1)) 
    {
        if(SecurityPerm1 == 0) continue;
        SecurityGen2->ResetIndex();
        Console::WriteLine(S"********************************************************\n");

        while(SecurityGen2->CreateSecurity(&SecurityPerm2, &Security2)) 
        {
            if(SecurityPerm2 == 0) continue;
            try
            {            
                if (SecurityPerm1->IsSubsetOf(SecurityPerm2))
                {
                    Console::WriteLine(S"{0} is a subset of {1}",
                        __box(SecurityPerm1->Flags), __box(SecurityPerm2->Flags));
                }
                else
                {
                    Console::WriteLine(S"{0} is not a subset of {1}",
                        __box(SecurityPerm1->Flags), __box(SecurityPerm2->Flags));
                }
            }
            catch(Exception* e) 
            {
                Console::WriteLine(S"An exception was thrown for subset :{0}\n{1}\n{2}",
                    SecurityPerm1, SecurityPerm2, e);
                returnValue=false;
            }
        }
    }
    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

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