c# - 如何通过 VSPackage 取消 ToolWindowPane 或 Visual Studio IDE 关闭操作？

Question

我有一个 VSPackage，它带有一个包含表单数据的可停靠工具窗口。如果此表单中有未保存的更改，如果用户在关闭前单击取消保存更改，我想取消关闭工具窗口和 visual studio IDE。我可以在关闭时执行保存测试，但我没有看到任何事件处理程序方法或其他选项来实际取消关闭。

这是包装中的一些简介:

    private DTE2 _applicationObject = null;
    ///--------------------------------------------------------------------------------
    /// <summary>This property gets the visual studio IDE application object.</summary>
    ///--------------------------------------------------------------------------------
    public DTE2 ApplicationObject
    {
        get
        {
            if (_applicationObject == null)
            {
                // Get an instance of the currently running Visual Studio IDE
                DTE dte = (DTE)GetService(typeof(DTE));
                _applicationObject = dte as DTE2;
            }
            return _applicationObject;
        }
    }
    ///--------------------------------------------------------------------------------
    /// <summary>
    /// Initialization of the package; this method is called right after the package is sited, so this is the place
    /// where you can put all the initilaization code that rely on services provided by VisualStudio.
    /// </summary>
    ///--------------------------------------------------------------------------------
    protected override void Initialize()
    {
        Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
        base.Initialize();

        // add the event handlers
        if (ApplicationObject != null)
        {
            // wire up window events
            PackageWindowEvents = (WindowEvents)ApplicationObject.Events.get_WindowEvents(null);
            PackageWindowEvents.WindowClosing += new _dispWindowEvents_WindowClosingEventHandler(PackageWindowEvents_WindowClosing);

            // wire up solution events
            PackageSolutionEvents = ApplicationObject.Events.SolutionEvents;
            PackageSolutionEvents.Opened += new _dispSolutionEvents_OpenedEventHandler(CheckOpenCurrentSolution);

            // wire up DTE events
            PackageDTEEvents = ApplicationObject.Events.DTEEvents;
            PackageDTEEvents.OnBeginShutdown += new _dispDTEEvents_OnBeginShutdownEventHandler(HandleVisualStudioShutdown);
        }
    }

    void PackageWindowEvents_WindowClosing(Window window)
    {
        // handle save/cancel scenarios
    }

还有来自实现 IVsWindowFrameNotify3 的 ToolWindowPane 的一些简介:

    protected override void OnClose()
    {
        base.OnClose();
    }
    public int OnClose(ref uint pgrfSaveOptions)
    {
        return (int)__FRAMECLOSE.FRAMECLOSE_PromptSave;
    }

OnClose 和 WindowClosing 方法会按预期触发，但我找不到取消关闭的方法。我错过了什么？取消关闭需要不同的事件吗？

Answer 1

为了完整起见，有一种使用工具窗口取消关闭的有用方法(由用户 Chicobo 在 msdn 论坛上提供并重复 here)。

1. 在您的 ToolWindowPane 类中，实现 IVsWindowFrameNotify2 接口(interface)，该接口(interface)提供方法 OnClose。

2. 要取消窗口关闭，考虑使用:

   public int OnClose(ref uint pgrfSaveOptions)
   {
       // Check if your content is dirty here, then
   
       // Prompt a dialog
       MessageBoxResult res = MessageBox.Show("This Document has been modified. Do you want to save the changes ?",
                     "Unsaved changes", MessageBoxButton.YesNoCancel, MessageBoxImage.Warning);
       // If the users wants to save
       if (res == MessageBoxResult.Yes)
       {
           // Handle with your "save method here"
       }
   
       if (res == MessageBoxResult.Cancel)
       {
           // If "cancel" is clicked, abort the close
           return VSConstants.E_ABORT;
       }
   
       // Else, exit
       return VSConstants.S_OK;
   }