WPF捕捉Windows关机事件

   private const int SC_SCREENSAVE = 0xF140;
        private const int WM_QUERYENDSESSION = 0x0011;
        private bool IsScreenSave = false;
        private bool IsWindowStopClosing = false;

不废话，直接贴代码,构造函数中

public XX{

   // 获得窗口句柄
                IntPtr hwnd = new WindowInteropHelper(this).Handle;
                // 在Win32窗口中显示WPF的内容
                HwndSource src = HwndSource.FromHwnd(hwnd);
                //接收窗口消息的处理程序实现（基于 System.Windows.Interop.HwndSourceHook 委托）
                src.AddHook(new HwndSourceHook(WndProc));

}

    /// <summary>
        /// 重新WndProc
        /// </summary>
        /// <param name="hwnd">窗口句柄</param>
        /// <param name="msg">消息ID</param>
        /// <param name="wParam">消息的 wParam 值</param>
        /// <param name="lParam">消息的 lParam 值</param>
        /// <param name="handled">指示该消息是否已处理的值。如果该消息已处理，请将值设置为 true；否则请将其设置为 false</param>
        /// <returns></returns>
        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == WM_QUERYENDSESSION)
            {
                using (var wcf = new KeFuServicesClient())
                {
                    wcf.UpdateUserState(MainPanelWindow.ClientServiceID, UserStates.UnLine);
                }
            }
            return IntPtr.Zero;
        }

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