WPF：如何区分Window.Close（）调用和系统菜单“关闭”操作？ [英] WPF: How to distinguish between Window.Close() call and system menu Close action?

问题描述

可能重复：

Possible Duplicate:
How to distinguish ‘Window close button clicked (X)’ vs. window.Close() in closing handler

在WPF中，以下是关闭 Window ：

In WPF, here are different ways to close a Window:

1） Window.Close（）

2）选择从窗口系统菜单（左上）

关闭）3）单击窗口标题栏上的 X按钮（右上）

4）键盘快捷键：Alt + F4

1) Window.Close()
2) Select 'Close' from Window system menu (top left)
3) Click 'X' button on Window title bar (top right)
4) Keyboard shortcut: Alt+F4

所有这些操作都会触发WPF事件 Window.Closing

All of these actions trigger WPF event Window.Closing

如何区分这两种类型的操作？

How do I distinguish between these two types of actions?

在Excel / VBA中，这是可能的： VBA.VbQueryClose.vbFormCode 与 VBA.VbQueryClose.vbFormControlMenu 。

In Excel/VBA this is possible: VBA.VbQueryClose.vbFormCode vs VBA.VbQueryClose.vbFormControlMenu.

，说系统菜单操作将生成Windows事件 WM_CLOSE 。也许有一种方法可以从WPF中查看基础Windows事件。

This related question/answer says the system menu actions will generate Windows event WM_CLOSE. Perhaps there is a way to see the underlying Windows event from WPF.

推荐答案

您可以调用HwndSource.AddHook来处理Win32消息，得到一个窗口的关闭原因。
类似于：

You can call HwndSource.AddHook to process Win32 message to get close reason of a Window. Something like:

Window myWindow = new Window();
myWindow .Loaded += delegate
{
    HwndSource source = (HwndSource)PresentationSource.FromDependencyObject(myWindow );
    source.AddHook(WindowProc);
};

WindowProc的实现：

And the implementation of the WindowProc:

    private static IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam,      
      ref bool handled){
     switch (msg)
     {
         case: 0x10:
              Console.WriteLine("Close reason: Clicking X");
         case 0x11:
         case 0x16:
             Console.WriteLine("Close reason: WindowsShutDown");
             break;

         case 0x112:
             if (((ushort)wParam & 0xfff0) == 0xf060)
                 Console.WriteLine("Close reason: User closing from menu");
             break;
     }
     return IntPtr.Zero;
    }

并且您具有所有Windows消息的列表

用于WM_SYSCOMMND的wParam的值

希望这会有所帮助。

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