TextBox的OnTextboxChanged事件里對Text重新賦值帶中文，導致崩潰 · WPF編程之路

今天遇到一個超級bug， Textbox做了限制，只能輸入數字。結果在搜狗輸入法輸入中文時導致崩潰，出錯信息如下：未處理 System.InvalidOperationException Message=無法關閉撤消單元，因為不存在已打開的單元**。** Source=PresentationFramework StackTrace: ? ? ?在 MS.Internal.Documents.UndoManager.Close(IParentUndoUnit unit, UndoCloseAction closeAction) ? ? ?在 System.Windows.Documents.ImmComposition.CloseCompositionUndoUnit(UndoCloseAction undoCloseAction, ITextPointer compositionEnd) ? ? ?在 System.Windows.Documents.ImmComposition.UpdateCompositionText(FrameworkTextComposition composition, Int32 resultLength, Boolean includeResultText, ITextPointer& start, ITextPointer& end) ? ? ?在 System.Windows.Documents.ImmComposition.RaiseTextInputStartEvent(FrameworkTextComposition composition, Int32 resultLength, String compositionString) ? ? ?在 System.Windows.Documents.ImmComposition.OnWmImeChar(IntPtr wParam, Boolean& handled) ? ? ?在 System.Windows.Documents.ImmComposition.ImmCompositionFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) ? ? ?在 System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) ? ? ?在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) ? ? ?在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) ? ? ?在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) ? ? ?在 MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) ? ? ?在 System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) ? ? ?在 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) ? ? ?在 MS.Win32.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) ? ? ?在 MS.Win32.HwndSubclass.DefWndProcWrapper(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) ? ? ?在 MS.Win32.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) ? ? ?在 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) ? ? ?在 MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) ? ? ?在 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) ? ? ?在 System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) ? ? ?在 System.Windows.Application.RunDispatcher(Object ignore) ? ? ?在 System.Windows.Application.RunInternal(Window window) ? ? ?在 System.Windows.Application.Run(Window window) ? ? ?在 System.Windows.Application.Run() ? ? ?在 LiveChainCHIS_Client.App.Main() 位置 D:\項目\LiveChainCHIS-Client\LiveChainCHIS-Client\obj\x86\Debug\App**.**g.cs:行號 0 ? ? ?在 System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) ? ? ?在 System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) ? ? ?在 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() ? ? ?在 System.Threading.ThreadHelper.ThreadStart_Context(Object state) ? ? ?在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) ? ? ?在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) ? ? ?在 System.Threading.ThreadHelper.ThreadStart() InnerException:? 補充說明一下，這個錯誤只出現于數據綁定后的TextBox控件上。解決辦法：??設置Textbox的UndoLimit?為0就ok。? 可以參考：?[http://social.msdn.microsoft.com/Forums/zh-CN/wpfzhchs/thread/06b9f4a1-d4a5-456b-bedc-ffc8f8019445](http://social.msdn.microsoft.com/Forums/zh-CN/wpfzhchs/thread/06b9f4a1-d4a5-456b-bedc-ffc8f8019445)