UIPermission.Intersect(IPermission) 方法

定义

命名空间:

System.Security.Permissions

程序集:

System.Security.Permissions.dll

程序集:

mscorlib.dll

创建并返回一个权限，该权限是当前权限与指定权限的交集。

public:
 override System::Security::IPermission ^ Intersect(System::Security::IPermission ^ target);

public override System.Security.IPermission Intersect (System.Security.IPermission target);

override this.Intersect : System.Security.IPermission -> System.Security.IPermission

Public Overrides Function Intersect (target As IPermission) As IPermission

参数

target

IPermission

要与当前权限相交的权限。 它必须与当前权限属于同一类型。

返回

IPermission

表示当前权限和指定权限的交集的一个新权限。 如果交集为空，则此新权限为 null。

例外

ArgumentException

target 参数不为 null，并且与当前权限不属于同一类型。

示例

下面的代码示例显示了该方法的行为 Intersect 。 此示例是为类提供的大型示例的 UIPermission 一部分。

备注

代码示例旨在显示方法的行为，而不是演示该方法的使用。 一般情况下，安全基础结构使用权限类的方法：它们通常不用于应用程序。

// Intersect creates and returns a new permission that is the intersection of the
// current permission and the permission specified.
void IntersectDemo()
{
    Console::WriteLine("\n**********************  Intersect() Demo ***********************\n");
    UIPermission ^ uiPerm1 = gcnew UIPermission(UIPermissionWindow::SafeTopLevelWindows,UIPermissionClipboard::OwnClipboard);
    UIPermission ^ uiPerm2 = gcnew UIPermission(UIPermissionWindow::SafeSubWindows,UIPermissionClipboard::NoClipboard);
    UIPermission ^ p3 = (UIPermission^)uiPerm1->Intersect(uiPerm2);

        Console::WriteLine("   The intersection of {0} and \n\t{1} = {2} ", uiPerm1->Window,
                               uiPerm1->Window, (nullptr != p3)?p3->Window.ToString():"null");

        Console::WriteLine("   The intersection of " + uiPerm1->Clipboard.ToString() + " and \n\t" +
                uiPerm2->Clipboard.ToString() + " is " + p3->Clipboard.ToString());
}

// Intersect creates and returns a new permission that is the intersection of the
// current permission and the permission specified.
private static void IntersectDemo()
{
    UIPermission uiPerm1 = new UIPermission(UIPermissionWindow.SafeTopLevelWindows, UIPermissionClipboard.OwnClipboard);
    UIPermission uiPerm2 = new UIPermission(UIPermissionWindow.SafeSubWindows, UIPermissionClipboard.NoClipboard);
    UIPermission p3 = (UIPermission)uiPerm1.Intersect(uiPerm2);

    Console.WriteLine("The intersection of " + uiPerm1.Window.ToString() + " and \n\t" +
        uiPerm2.Window.ToString() + " is " + p3.Window.ToString() + "\n");
    Console.WriteLine("The intersection of " + uiPerm1.Clipboard.ToString() + " and \n\t" +
            uiPerm2.Clipboard.ToString() + " is " + p3.Clipboard.ToString() + "\n");
}

' Intersect creates and returns a new permission that is the intersection of the
' current permission and the permission specified.
Private Shared Sub IntersectDemo()
    Dim uiPerm1 As New UIPermission(UIPermissionWindow.SafeTopLevelWindows, UIPermissionClipboard.OwnClipboard)
    Dim uiPerm2 As New UIPermission(UIPermissionWindow.SafeSubWindows, UIPermissionClipboard.NoClipboard)
    Dim p3 As UIPermission = CType(uiPerm1.Intersect(uiPerm2), UIPermission)

    Console.WriteLine("The intersection of " + uiPerm1.Window.ToString() + " and " + vbLf + vbTab + uiPerm2.Window.ToString() + " is " + p3.Window.ToString() + vbLf)
    Console.WriteLine("The intersection of " + uiPerm1.Clipboard.ToString() + " and " + vbLf + vbTab + uiPerm2.Clipboard.ToString() + " is " + p3.Clipboard.ToString() + vbLf)

End Sub

注解

两个权限的交集是描述它们共同描述的操作集的权限。 具体而言，它表示当前权限和指定权限中的最小允许值以及来自这些值UIPermissionWindowUIPermissionClipboard。