处理来自图标的应用程序关闭调用

Question

我已经在我的主窗口上添加了用于单击 X 的 Closing 事件的代码，并且它能够毫无问题地取消该事件（它通过“你确定吗？确保保存”键入对话框和关闭事件）

不幸的是，如果我双击该图标，它会在 RibbonWindow_Closing 事件上命中我的断点，但是当 e.Cancel 设置为 true 时，它​​无论如何都会关闭，就好像它被 Application.Current.Shutdown() 调用一样

Alt-F4（和图标 -> 关闭）和 X 按钮都被正确处理，但没有双击图标本身

有人知道为什么会这样吗？我正在使用 Prism，如果重要的话，主窗口是由引导程序创建的。

这是堆栈跟踪，除了点击我的 RibbonWindow_Closing 事件之外，它的所有外部代码：

MyProgram.exe!MyProgram.Shell.RibbonWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e) Line 64  C#
 PresentationFramework.dll!System.Windows.Window.OnClosing(System.ComponentModel.CancelEventArgs e) + 0x91 bytes    

PresentationFramework.dll!System.Windows.Window.WmClose() + 0x96 bytes  
    PresentationFramework.dll!System.Windows.Window.WindowFilterMessage(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) + 0xe5 bytes 
 PresentationCore.dll!System.Windows.Interop.HwndSource.PublicHooksFilterMessage(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) + 0x7e bytes    
 WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) + 0xbe bytes   
 WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) + 0x7d bytes   
 WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) + 0x53 bytes    
 WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source, System.Delegate method, object args, int numArgs, System.Delegate catchHandler) + 0x42 bytes   
 WindowsBase.dll!System.Windows.Threading.Dispatcher.InvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs) + 0xb4 bytes   
 WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam) + 0x104 bytes   
 [Native to Managed Transition] 
 [Managed to Native Transition] 
 PresentationFramework.dll!System.Windows.Window.InternalClose(bool shutdown, bool ignoreCancel) + 0xa1 bytes   
 PresentationFramework.dll!System.Windows.Application.DoShutdown() + 0x1b6 bytes    
 PresentationFramework.dll!System.Windows.Application.ShutdownImpl() + 0x1c bytes   
 PresentationFramework.dll!System.Windows.Application.ShutdownCallback(object arg) + 0x5 bytes  
    WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) + 0x53 bytes 
 WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source, System.Delegate method, object args, int numArgs, System.Delegate catchHandler) + 0x42 bytes   
 WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeImpl() + 0x8d bytes 

测试 RibbonWindow，给出消息但仍然关闭

<ribbon:RibbonWindow x:Class="MyProject.TestShell"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"
        Title="TestShell" Height="300" Width="300" Closing="Window_Closing">
    <Grid>
        <DockPanel LastChildFill="True">
        </DockPanel>
    </Grid>
</ribbon:RibbonWindow>

这作为一个常规窗口工作，获取消息并保持打开状态：

<Window x:Class="MyProject.TestShell"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TestShell" Height="300" Width="300" Closing="Window_Closing">
    <Grid>
        <DockPanel LastChildFill="True">
        </DockPanel>
    </Grid>
</Window>

后面的代码很简单：

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
    e.Cancel = true;
    MessageBox.Show("No close!");
}

更新

好的，我将其缩小为 RibbonWindow 控件的问题，显然它会在双击图标时关闭应用程序。

显然，如果以同样的方式关闭子窗口，它也会关闭主应用程序：http://social.msdn.microsoft.com/Forums/en/wpf/thread/3e9cdc9c-dfb7-49f2-923a-ead07504d568

/// <summary>
///   This handles the click events on the window icon.
/// </summary>
/// <param name="sender">Click event sender</param>
/// <param name="e">event args</param>
private void IconMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount == 1)
    {
        if (SystemCommands.ShowSystemMenuCommand.CanExecute(null, this))
        {
            SystemCommands.ShowSystemMenuCommand.Execute(null, this);
        }
    }
    else if (e.ClickCount == 2)
    {
        if (ApplicationCommands.Close.CanExecute(null, this))
        {
            ApplicationCommands.Close.Execute(null, this);
        }
    }
}

Answer 1

好的，我将其缩小为 RibbonWindow 控件的问题，显然它会在双击图标时关闭应用程序。

http://social.msdn.microsoft.com/Forums/en/wpf/thread/3e9cdc9c-dfb7-49f2-923a-ead07504d568

/// <summary>
///   This handles the click events on the window icon.
/// </summary>
/// <param name="sender">Click event sender</param>
/// <param name="e">event args</param>
private void IconMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount == 1)
    {
        if (SystemCommands.ShowSystemMenuCommand.CanExecute(null, this))
        {
            SystemCommands.ShowSystemMenuCommand.Execute(null, this);
        }
    }
    else if (e.ClickCount == 2)
    {
        if (ApplicationCommands.Close.CanExecute(null, this))
        {
            ApplicationCommands.Close.Execute(null, this);
        }
    }
}

我在这里找到了解决方案：http://social.msdn.microsoft.com/Forums/en/wpf/thread/9955b191-13d5-4986-a5c0-e73f50a44b44

这是注册我自己的ApplicationClosing命令，例如：

[Export]
public partial class TestShell : RibbonWindow
{
    public TestShell()
    {
        InitializeComponent();

        CommandManager.RegisterClassCommandBinding(typeof(TestShell), new CommandBinding(ApplicationCommands.Close, CloseApplicationExecuted));
    }

    private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        e.Cancel = true;
        MessageBox.Show("Not closing 1!");
    }

    private static void CloseApplicationExecuted(object sender, ExecutedRoutedEventArgs args)
    {
        RibbonWindow window = sender as RibbonWindow;
        if (window != null)
        {
            MessageBox.Show("Not closing 2!");
            args.Handled = true;
        }
    }
}

现在，如果我双击图标，我会得到“不关闭 2！”，而任何其他关闭方法我都会得到“不关闭 1！”

希望这可以节省我花费数小时才弄清楚的时间。感谢 Hans 帮助我诊断问题。

更新：如果您希望 CloseApplicationExecuted 触发与常规关闭相同的事件，只需调用

private static void CloseApplicationExecuted(object sender, ExecutedRoutedEventArgs args)
    {
        RibbonWindow window = sender as RibbonWindow;
        if (window != null)
        {
            args.Handled = true;
            window.Close();
        }
    }