wpf 如何在关闭处理程序中区分“单击窗口关闭按钮（X）”与 window.Close()
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How to distinguish 'Window close button clicked (X)' vs. window.Close() in closing handler
提问by mola
Is there a clever way to detect whether a window was closed by
有没有一种聪明的方法来检测窗口是否被关闭
- A user pressing the (X) button in the upper right corner of the window or
- window.Close() has been called programatically.
- 用户按下窗口右上角的 (X) 按钮或
- window.Close() 已被以编程方式调用。
I would like to detect this in the window.Closing handler. I could set a flag whenever I call window.Close(), but this is not a very pretty solution.
我想在 window.Closing 处理程序中检测到这一点。我可以在每次调用 window.Close() 时设置一个标志，但这不是一个很好的解决方案。
回答by Andy
I'm not sure I like this at all but it's a question that you obviously have a reason for asking. if you were to take a stack trace in the OnClosing event you could look up for the Window.Close event.
我不确定我是否喜欢这个问题，但您显然有理由提出这个问题。如果您要在 OnClosing 事件中进行堆栈跟踪，您可以查找 Window.Close 事件。
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
bool wasCodeClosed = new StackTrace().GetFrames().FirstOrDefault(x => x.GetMethod() == typeof(Window).GetMethod("Close")) != null;
if (wasCodeClosed)
{
// Closed with this.Close()
}
else
{
// Closed some other way.
}
base.OnClosing(e);
}
回答by norekhov
The difference is the following:
区别如下：
Window.Close() causes WM_CLOSE to be send to window.
Window.Close() 导致 WM_CLOSE 被发送到窗口。
Alt+F4 and X button causes WM_SYSCOMMAND message with SC_CLOSE type. You can decide if you wish to route this message further ( and cause WM_CLOSE in the end ).
Alt+F4 和 X 按钮会产生 SC_CLOSE 类型的 WM_SYSCOMMAND 消息。您可以决定是否希望进一步路由此消息（并最终导致 WM_CLOSE）。
Here's a piece of code to catch this message. Return "True" from delegate if you wish to cancel default behaviour:
这是捕获此消息的一段代码。如果您希望取消默认行为，请从委托返回“True”：
class SystemMenu : IDisposable
{
const int WM_SYSCOMMAND = 0x0112;
const int SC_CLOSE = 0xF060;
public delegate bool HandleSystemCommand();
HwndSource _source;
HandleSystemCommand _handler;
public SystemMenu(Window window, HandleSystemCommand handler )
{
_handler = handler;
_source = HwndSource.FromHwnd(new WindowInteropHelper( window ).Handle);
_source.AddHook(WndProc);
}
public void Dispose() {
_source.RemoveHook(WndProc);
}
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case WM_SYSCOMMAND:
int command = wParam.ToInt32() & 0xfff0;
if (command == SC_CLOSE)
handled = _handler();
break;
default:
break;
}
return IntPtr.Zero;
}
}
