RadWindow WPF 中的 WndProc

Question

我正在尝试在我的 WPF 应用程序中检测 Windows LogOff 或 Shutdown。有人可以帮忙吗？

xaml.cs

private static int WM_QUERYENDSESSION = 0x11;
private static bool systemShutdown = false;
public static event Microsoft.Win32.SessionEndingEventHandler SessionEnding;

protected virtual void WndProc(ref System.Windows.Forms.Message m)
{
    if (m.Msg == WM_QUERYENDSESSION)
    {
        MessageBox.Show("queryendsession: this is a logoff, shutdown, or reboot");
        systemShutdown = true;
    }

    // If this is WM_QUERYENDSESSION, the closing event should be  
    // raised in the base WndProc.  
    base.WndProc(ref m);  //Error

} //WndProc

错误：RadWindow 不包含“WndProc”的定义

Answer 1

一旦您的RadWindow 被加载，您应该能够获得对父 WPF 窗口的引用并创建一个 Win32 挂钩：

public class MyRadWindow : RadWindow
{
    public MyRadWindow()
    {
        Loaded += MyRadWindow_Loaded;
    }

    private void MyRadWindow_Loaded(object sender, System.Windows.RoutedEventArgs e)
    {
        System.Windows.Window wpfWindow = this.ParentOfType<System.Windows.Window>();
        HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(wpfWindow).Handle);
        source.AddHook(new HwndSourceHook(WndProc));
    }

    private const int WM_QUERYENDSESSION = 0x11;
    private static IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        if (msg == WM_QUERYENDSESSION)
        {
            //...
        }

        return IntPtr.Zero;
    }

    ...
}