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UIPermission.IsSubsetOf(IPermission) 方法

定義

判斷目前權限是否為指定權限的子集。

public:
 override bool IsSubsetOf(System::Security::IPermission ^ target);
public override bool IsSubsetOf (System.Security.IPermission target);
override this.IsSubsetOf : System.Security.IPermission -> bool
Public Overrides Function IsSubsetOf (target As IPermission) As Boolean

參數

target
IPermission

要測試子集關聯性的權限。 這個權限必須與目前權限屬於相同的類型。

傳回

如果目前權限是指定權限的子集,則為 true,否則為 false

例外狀況

target 參數不是 null,而且與目前權限屬於不同的類型。

範例

下列程式碼範例顯示 方法的行為 IsSubsetOf 。 此範例是針對 類別提供的較大範例的 UIPermission 一部分。

注意

程式碼範例旨在顯示 方法的行為,而不是示範其用法。 一般而言,安全性基礎結構會使用許可權類別的方法;它們通常不會用於應用程式。

// IsSubsetOf determines whether the current permission is a subset of the specified permission.

void IsSubsetOfDemo()
{
    Console::WriteLine("\n**********************  IsSubsetOf() Demo **********************\n");
    UIPermission ^ uiPerm1 = gcnew UIPermission(UIPermissionWindow::SafeTopLevelWindows);
    UIPermission ^ uiPerm2 = gcnew UIPermission(UIPermissionWindow::SafeSubWindows);

    Console::WriteLine("   {0} is {1}a subset of {2} ", uiPerm1->Window,
                            uiPerm1->IsSubsetOf(uiPerm2)?"":"not ", uiPerm2->Window);

    Console::WriteLine("   {0} is {1}a subset of {2} ", uiPerm2->Window,
                            uiPerm2->IsSubsetOf(uiPerm1)?"":"not ", uiPerm1->Window);

    uiPerm1 = gcnew UIPermission(UIPermissionClipboard::AllClipboard);
    uiPerm2 = gcnew UIPermission(UIPermissionClipboard::OwnClipboard);

    Console::WriteLine("   {0} is {1}a subset of {2} ", uiPerm1->Clipboard,
                            uiPerm1->IsSubsetOf(uiPerm2)?"":"not ", uiPerm2->Clipboard);

    Console::WriteLine("   {0} is {1}a subset of {2} ", uiPerm2->Clipboard,
                            uiPerm2->IsSubsetOf(uiPerm1)?"":"not ", uiPerm1->Clipboard);
}
// IsSubsetOf determines whether the current permission is a subset of the specified permission.
private static void IsSubsetOfDemo()
{
    UIPermission uiPerm1 = new UIPermission(UIPermissionWindow.SafeTopLevelWindows);
    UIPermission uiPerm2 = new UIPermission(UIPermissionWindow.SafeSubWindows);
    CheckIsSubsetOfWindow(uiPerm1, uiPerm2);
    uiPerm1 = new UIPermission(UIPermissionClipboard.AllClipboard);
    uiPerm2 = new UIPermission(UIPermissionClipboard.OwnClipboard);
    CheckIsSubsetOfClipBoard(uiPerm1, uiPerm2);
}
private static void CheckIsSubsetOfWindow(UIPermission uiPerm1, UIPermission uiPerm2)
{
    if (uiPerm1.IsSubsetOf(uiPerm2))
    {
        Console.WriteLine(uiPerm1.Window.ToString() + " is a subset of " +
            uiPerm2.Window.ToString());
    }
    else
    {
        Console.WriteLine(uiPerm1.Window.ToString() + " is not a subset of " +
            uiPerm2.Window.ToString());
    }
    if (uiPerm2.IsSubsetOf(uiPerm1))
    {
        Console.WriteLine(uiPerm2.Window.ToString() + " is a subset of " +
            uiPerm1.Window.ToString());
    }
    else
    {
        Console.WriteLine(uiPerm2.Window.ToString() + " is not a subset of " +
            uiPerm1.Window.ToString());
    }
}
private static void CheckIsSubsetOfClipBoard(UIPermission uiPerm1, UIPermission uiPerm2)
{
    if (uiPerm1.IsSubsetOf(uiPerm2))
    {
        Console.WriteLine(uiPerm1.Clipboard.ToString() + " is a subset of " +
            uiPerm2.Clipboard.ToString());
    }
    else
    {
        Console.WriteLine(uiPerm1.Clipboard.ToString() + " is not a subset of " +
            uiPerm2.Clipboard.ToString());
    }
    if (uiPerm2.IsSubsetOf(uiPerm1))
    {
        Console.WriteLine(uiPerm2.Clipboard.ToString() + " is a subset of " +
            uiPerm1.Clipboard.ToString());
    }
    else
    {
        Console.WriteLine(uiPerm2.Clipboard.ToString() + " is not a subset of " +
            uiPerm1.Clipboard.ToString());
    }
}
' IsSubsetOf determines whether the current permission is a subset of the specified permission.
Private Shared Sub IsSubsetOfDemo()
    Dim uiPerm1 As New UIPermission(UIPermissionWindow.SafeTopLevelWindows)
    Dim uiPerm2 As New UIPermission(UIPermissionWindow.SafeSubWindows)
    CheckIsSubsetOfWindow(uiPerm1, uiPerm2)
    uiPerm1 = New UIPermission(UIPermissionClipboard.AllClipboard)
    uiPerm2 = New UIPermission(UIPermissionClipboard.OwnClipboard)
    CheckIsSubsetOfClipBoard(uiPerm1, uiPerm2)

End Sub

Private Shared Sub CheckIsSubsetOfWindow(ByVal uiPerm1 As UIPermission, ByVal uiPerm2 As UIPermission)
    If uiPerm1.IsSubsetOf(uiPerm2) Then
        Console.WriteLine(uiPerm1.Window.ToString() + " is a subset of " + uiPerm2.Window.ToString())
    Else
        Console.WriteLine(uiPerm1.Window.ToString() + " is not a subset of " + uiPerm2.Window.ToString())
    End If

    If uiPerm2.IsSubsetOf(uiPerm1) Then
        Console.WriteLine(uiPerm2.Window.ToString() + " is a subset of " + uiPerm1.Window.ToString())
    Else
        Console.WriteLine(uiPerm2.Window.ToString() + " is not a subset of " + uiPerm1.Window.ToString())
    End If

End Sub

Private Shared Sub CheckIsSubsetOfClipBoard(ByVal uiPerm1 As UIPermission, ByVal uiPerm2 As UIPermission)
    If uiPerm1.IsSubsetOf(uiPerm2) Then
        Console.WriteLine(uiPerm1.Clipboard.ToString() + " is a subset of " + uiPerm2.Clipboard.ToString())
    Else
        Console.WriteLine(uiPerm1.Clipboard.ToString() + " is not a subset of " + uiPerm2.Clipboard.ToString())
    End If

    If uiPerm2.IsSubsetOf(uiPerm1) Then
        Console.WriteLine(uiPerm2.Clipboard.ToString() + " is a subset of " + uiPerm1.Clipboard.ToString())
    Else
        Console.WriteLine(uiPerm2.Clipboard.ToString() + " is not a subset of " + uiPerm1.Clipboard.ToString())
    End If

End Sub

備註

如果目前許可權的所有要求對目前許可權都成功,則目前的許可權是指定許可權的子集。 也就是說,指定的許可權至少包含子集中包含的許可權。 若要 IsSubsetOf 傳回 true ,目前許可權的 UIPermissionWindowUIPermissionClipboard 值必須等於或小於指定許可權的值。

適用於