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 1     public MainWindow()
 2     {
 3         InitializeComponent();
 4         Loaded += OnLoaded;
 5     }
 6 
 7     private void OnLoaded(object sender, RoutedEventArgs e)
 8     {
 9         Loaded -= OnLoaded;
10         var source = PresentationSource.FromVisual(this) as HwndSource;
11         source?.AddHook(WndProc);
12     }
13     const int WM_QUERYENDSESSION = 0x11;
14     const int WM_ENDSESSION = 0x16;
15     private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
16     {
17         if (msg == WM_QUERYENDSESSION)
18         {
19             var handle = new WindowInteropHelper(this).Handle;
20             ShutdownBlockReasonCreate(handle, "應(yīng)用保存數(shù)據(jù)中，請等待...");
21             // 可以在這里執(zhí)行你的業(yè)務(wù)邏輯
22             bool executeSuccess = ExecuteShutdownWork();
23             // 返回0表示阻止關(guān)機(jī)，1表示允許關(guān)機(jī)
24             handled = true;
25             return executeSuccess ? (IntPtr)1 : (IntPtr)0;
26         }
27         return (IntPtr)1;
28     }
29 
30     private bool ExecuteShutdownWork()
31     {
32         Thread.Sleep(TimeSpan.FromSeconds(20));
33         //測試，默認(rèn)返回操作失敗
34         return false;
35     }
36 
37     [DllImport("user32.dll")]
38     private static extern bool ShutdownBlockReasonCreate(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] string reason);
39     [DllImport("user32.dll")]
40     private static extern bool ShutdownBlockReasonDestroy(IntPtr hWnd);

 1     public partial class App : Application
 2     {
 3         public App()
 4         {
 5             SystemEvents.SessionEnding += SystemEvents_SessionEnding;
 6             Application.Current.Exit += Current_Exit;
 7         }
 8         private void Current_Exit(object sender, ExitEventArgs e)
 9         {
10             SystemEvents.SessionEnding -= SystemEvents_SessionEnding;
11         }
12         private void SystemEvents_SessionEnding(object sender, SessionEndingEventArgs e)
13         {
14             if (e.Reason == SessionEndReasons.SystemShutdown)
15             {
16                 var handle = new WindowInteropHelper(Application.Current.MainWindow).Handle;
17                 ShutdownBlockReasonDestroy(handle);
18                 ShutdownBlockReasonCreate(handle, "應(yīng)用保存數(shù)據(jù)中，請等待...");
19 
20                 var executeSuccess = ExecuteShutdownWork();
21                 e.Cancel = !executeSuccess;
22             }
23         }
24         private bool ExecuteShutdownWork()
25         {
26             //Test
27             Thread.Sleep(TimeSpan.FromSeconds(200));
28             return false;
29             try
30             {
31                 // XXX
32                 return true;
33             }
34             catch (Exception e)
35             {
36                 return false;
37             }
38         }
39 
40         [DllImport("user32.dll")]
41         private static extern bool ShutdownBlockReasonCreate(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] string reason);
42         [DllImport("user32.dll")]
43         private static extern bool ShutdownBlockReasonDestroy(IntPtr hWnd);
44     }

1     public MainWindow()
2     {
3         InitializeComponent();
4         //在構(gòu)造中設(shè)置Hide或者Show之后立即設(shè)置Hide，均會導(dǎo)致關(guān)機(jī)阻止失敗
5         Hide();
6     }

 1     public MainWindow()
 2     {
 3         InitializeComponent();
 4         Loaded += MainWindow_Loaded;
 5     }
 6     private void MainWindow_Loaded(object sender, RoutedEventArgs e)
 7     {
 8         Loaded -= MainWindow_Loaded;
 9         //如果啟動后需要立即隱藏窗口，請放在Loaded之后
10         Hide();
11     }

 1     public partial class MainWindow : Window
 2     {
 3         public MainWindow()
 4         {
 5             InitializeComponent();
 6             Loaded += MainWindow_Loaded;
 7         }
 8         private void MainWindow_Loaded(object sender, RoutedEventArgs e)
 9         {
10             Loaded -= MainWindow_Loaded;
11             var currentMainWindow = Application.Current.MainWindow;
12             var handle = new WindowInteropHelper(currentMainWindow).Handle;
13             ShutdownBlockReasonDestroy(handle);
14             ShutdownBlockReasonCreate(handle, "應(yīng)用保存數(shù)據(jù)中，請等待...");
15 
16             //窗口Hide，并不影響上面的ShutdownBlockReasonDestroy
17             Hide();
18         }
19         [DllImport("user32.dll")]
20         private static extern bool ShutdownBlockReasonCreate(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] string reason);
21         [DllImport("user32.dll")]
22         private static extern bool ShutdownBlockReasonDestroy(IntPtr hWnd);
23     }

1         public MainWindow()
2         {
3             InitializeComponent();
4 
5             // 在應(yīng)用程序啟動時調(diào)用
6             SetProcessShutdownParameters(0x4FF, 0);
7         }
8         [DllImport("kernel32.dll")]
9         static extern bool SetProcessShutdownParameters(uint dwLevel, uint dwFlags);