UIPermission.FromXml(SecurityElement) 方法

定義

命名空間:

System.Security.Permissions

組件:

System.Security.Permissions.dll

套件:

System.Security.Permissions v9.0.0-preview.6.24327.7

來源:

UIPermission.cs

透過 XML 編碼，重新建構具有指定狀態的權限。

public:
 override void FromXml(System::Security::SecurityElement ^ esd);

public override void FromXml (System.Security.SecurityElement esd);

override this.FromXml : System.Security.SecurityElement -> unit

Public Overrides Sub FromXml (esd As SecurityElement)

參數

esd

SecurityElement

用以重新建構權限的 XML 編碼方式。

例外狀況

ArgumentNullException

esd 參數為 null。

ArgumentException

esd 參數不是有效的權限項目。

-或-

esd 參數的版本號碼無效。

範例

下列程式代碼範例顯示 方法的行為 FromXml 。 這個範例是提供給 類別之較大範例的 UIPermission 一部分。

注意

程式代碼範例旨在顯示 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。

// ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
// permission with the specified state from the XML encoding.
void ToFromXmlDemo()
{
    Console::WriteLine("\n**********************  To/From XML() Demo *********************\n");

    UIPermission ^ uiPerm1 = gcnew UIPermission(UIPermissionWindow::SafeTopLevelWindows);
    UIPermission ^ uiPerm2 = gcnew UIPermission(PermissionState::None);
    uiPerm2->FromXml(uiPerm1->ToXml());
    bool result = uiPerm2->Equals(uiPerm1);
    if (result)
        Console::WriteLine("Result of ToFromXml = " + uiPerm2->ToString());
    else
        {
        Console::WriteLine(uiPerm2->ToString());
        Console::WriteLine(uiPerm1->ToString());
        }
}

// ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
// permission with the specified state from the XML encoding.
private static void ToFromXmlDemo()
{

    UIPermission uiPerm1 = new UIPermission(UIPermissionWindow.SafeTopLevelWindows);
    UIPermission uiPerm2 = new UIPermission(PermissionState.None);
    uiPerm2.FromXml(uiPerm1.ToXml());
    bool result = uiPerm2.Equals(uiPerm1);
    if (result)
    {
        Console.WriteLine("Result of ToFromXml = " + uiPerm2.ToString());
    }
    else
    {
        Console.WriteLine(uiPerm2.ToString());
        Console.WriteLine(uiPerm1.ToString());
    }
}

    ' ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
    ' permission with the specified state from the XML encoding.
    Private Shared Sub ToFromXmlDemo()


        Dim uiPerm1 As New UIPermission(UIPermissionWindow.SafeTopLevelWindows)
        Dim uiPerm2 As New UIPermission(PermissionState.None)
        uiPerm2.FromXml(uiPerm1.ToXml())
        Dim result As Boolean = uiPerm2.Equals(uiPerm1)
        If result Then
            Console.WriteLine("Result of ToFromXml = " + uiPerm2.ToString())
        Else
            Console.WriteLine(uiPerm2.ToString())
            Console.WriteLine(uiPerm1.ToString())
        End If

    End Sub
End Class