关闭DockContent文档后的DisposedObjectException

Question

当我关闭我的文档时，我发现DockPanelSuite有非常奇怪的行为。当我单击文档右上角的close 'X'时，顶部文档将按预期关闭(calls FormClosing event and Dispose() method of my derived DockContent class)，但文档中仍保留一个小选项卡。这就像DockContent意识到内容应该被丢弃，丢弃所有的内部控件，Form.Text从标签中消失一样，剩下的是一个没有任何文本的小标签。

再次尝试关闭该选项卡或单击该选项卡将导致'ObjectDisposedException'.

以下是我的环境规范：

Visual Studio 2008
DockPanelSuite AssemblyVersion("2.5.0.*")
Windows 7 x64

下面是一个堆栈跟踪。进入代码，我可以看到，当它试图获取IDragSource.DragControl时，它会崩溃，这是我已经释放的控件的一个实例

(control being a derived DockContent class):

at System.Windows.Forms.Control.CreateHandle()
at System.Windows.Forms.Form.CreateHandle()
at System.Windows.Forms.Control.get_Handle()
at WeifenLuo.WinFormsUI.Docking.DockPanel.DragHandlerBase.BeginDrag() in C:\Users\nick\Documents\Visual Studio 2008\Projects\DockPanel\WinFormsUI\Docking\DockPanel.DragHandler.cs:line 48
at WeifenLuo.WinFormsUI.Docking.DockPanel.DockDragHandler.BeginDrag(IDockDragSource dragSource) in C:\Users\nick\Documents\Visual Studio 2008\Projects\DockPanel\WinFormsUI\Docking\DockPanel.DockDragHandler.cs:line 699
at WeifenLuo.WinFormsUI.Docking.DockPanel.BeginDrag(IDockDragSource dragSource) in C:\Users\nick\Documents\Visual Studio 2008\Projects\DockPanel\WinFormsUI\Docking\DockPanel.DockDragHandler.cs:line 811
at WeifenLuo.WinFormsUI.Docking.DockPaneStripBase.OnMouseDown(MouseEventArgs e) in C:\Users\nick\Documents\Visual Studio 2008\Projects\DockPanel\WinFormsUI\Docking\DockPaneStripBase.cs:line 195
at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at WeifenLuo.WinFormsUI.Docking.DockPaneStripBase.WndProc(Message& m) in C:\Users\nick\Documents\Visual Studio 2008\Projects\DockPanel\WinFormsUI\Docking\DockPaneStripBase.cs:line 246
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at MosaicMaker.Program.Main() in C:\Users\nick\Documents\Visual Studio 2008\Projects\MosaicMaker\MosaicMaker\Program.cs:line 18
at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

提前感谢您的帮助。

除了这个小问题，我对这个库非常满意。

Answer 1

好吧，我发现我的代码是问题的根源。当DockContent窗体上的控件在其Dispose()方法中引发异常时，就会出现此问题。该控件未正确释放，并且由于某些原因，DockContent控件未正确关闭。