WPF在Focus()上崩溃 [英] WPF crashes on Focus()
问题描述
推荐答案
堆栈跟踪:
UITraceSource关键:0:08/06/2008 16:19:56:
类型:异常
消息:对象引用未设置为对象的实例.
源:PresentationFramework
目标站点:Void OnGotFocus()
Here is the stack trace:
UITraceSource Critical: 0 : 08/06/2008 16:19:56 :
Type : Exception
Message : Object reference not set to an instance of an object.
Source : PresentationFramework
Target Site : Void OnGotFocus()
堆栈跟踪:在System.Windows.Documents.TextStore.OnGotFocus()
在System.Windows.Documents.TextEditor.OnGotKeyboardFocus(Object sender，KeyboardFocusChangedEventArgs e)
在System.Windows.Controls.Primitives. TextBoxBase.OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
在System.Windows.UIElement.OnGotKeyboardFocusThunk(Object sender，KeyboardFocusChangedEventArgs e)
在System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler(Delegate) .System.Windows.RoutedEventHandlerInfo.InvokeHandler(对象目标，System.Windows.EventRoute.InvokeHandlersImpl(Object source，RoutedEventArgs args，Boolean)中的.Windows.RoutedEventArgs.InvokeHandler(委托处理程序，对象目标)
在System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args)处重新启动
在System.Windows.UIElement.RaiseEvent(RoutedEventArgs args，布尔值受信任)
处的System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args) Windows.Input.InputManager.ProcessStagingArea()
在System.Windows.Input.InputManager.ProcessInput(InputEventArgs输入)
在System.Windows.Input.KeyboardDevice.ChangeFocus(DependencyObject focus，Int32 timestamp)
在System.Windows.Input.KeyboardDevice.TryChangeFocus(DependencyObject newFocus，IKeyboardInputProvider keyboardInputProvider，布尔askOld，布尔askNew，布尔forceToNullIfFailed)在System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus，Boolean askOld，Boolean askNew)
>在System.Windows.Input.KeyboardDevice.Focus(IInputElement元素)
在System.Windows.UIElement.Focus()
在System.Windows.FrameworkElement.OnPreviewGotKeyboardFocus(对象发送方，KeyboardFocusChangedEventArgs e)
System.Windows.RoutedEventArgs.InvokeHandler(Delegate处理程序，对象目标)
在System.Windows.RoutedE上的System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler(Delegate genericHandler，对象genericTarget)
ventHandlerInfo.InvokeHandler(对象目标，位于System.Windows.EventRoute.InvokeHandlersImpl(Object source，RoutedEventArgs args，Boolean reRaised)
的System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args)
System.Windows.Input.InputManager.ProcessStagingArea()处的System.Windows.UIElement.RaiseEvent(RoutedEventArgs args，布尔值受信任)
System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
处的System.Windows.Input.InputManager.ProcessStagingArea()
System.Windows.Input.KeyboardDevice.TryChangeFocus(DependencyObject newFocus，IKeyboardInputProvider keyboardInputProvider，布尔askOld，布尔askNew，布尔forceToNullIfFailed)在System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus，Boolean askOld，Boolean askNew)
>在System.Windows.Input.KeyboardDevice.Focus(IInputElement元素)
在System.Windows.Input.Keyboard.Focus(IInputElement元素)
在System.Windows.Interop.HwndKeyboardInputProvider.OnRootChanged(V是System.Windows.Interop.HwndSource.set_RootVisualInternal(可视值)
上的isual oldRoot，Visual newRoot)，在System.Windows.Window是System.Windows.Interop.HwndSource.set_RootVisual(Visual值)
上.在System.Windows.Window.CreateSourceWindowImpl()的SetupInitialState(Double requestTop，Double requestLeft，Double requestWidth，Double requestHeight)
在System.Windows.Window.SafeCreateWindow()
在System.Windows.Window. System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate回调，Object args，Boolean isSingleParameter)的ShowHelper(Object booleanBox)
System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source，Delegate callback，Object args) ，布尔值isSingleParameter，委托catchHandler)
Stack Trace : at System.Windows.Documents.TextStore.OnGotFocus()
at System.Windows.Documents.TextEditor.OnGotKeyboardFocus(Object sender, KeyboardFocusChangedEventArgs e)
at System.Windows.Controls.Primitives.TextBoxBase.OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
at System.Windows.UIElement.OnGotKeyboardFocusThunk(Object sender, KeyboardFocusChangedEventArgs e)
at System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.KeyboardDevice.ChangeFocus(DependencyObject focus, Int32 timestamp)
at System.Windows.Input.KeyboardDevice.TryChangeFocus(DependencyObject newFocus, IKeyboardInputProvider keyboardInputProvider, Boolean askOld, Boolean askNew, Boolean forceToNullIfFailed)
at System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus, Boolean askOld, Boolean askNew)
at System.Windows.Input.KeyboardDevice.Focus(IInputElement element)
at System.Windows.UIElement.Focus()
at System.Windows.FrameworkElement.OnPreviewGotKeyboardFocus(Object sender, KeyboardFocusChangedEventArgs e)
at System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.KeyboardDevice.TryChangeFocus(DependencyObject newFocus, IKeyboardInputProvider keyboardInputProvider, Boolean askOld, Boolean askNew, Boolean forceToNullIfFailed)
at System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus, Boolean askOld, Boolean askNew)
at System.Windows.Input.KeyboardDevice.Focus(IInputElement element)
at System.Windows.Input.Keyboard.Focus(IInputElement element)
at System.Windows.Interop.HwndKeyboardInputProvider.OnRootChanged(Visual oldRoot, Visual newRoot)
at System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)
at System.Windows.Interop.HwndSource.set_RootVisual(Visual value)
at System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)
at System.Windows.Window.CreateSourceWindowImpl()
at System.Windows.Window.SafeCreateWindow()
at System.Windows.Window.ShowHelper(Object booleanBox)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
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