WPF passwordbox resolution for program exception exit when mouse entry

Recently in the development of a program used in the PasswordBox control, but in the program to others, when the mouse into the control when the program exits unexpectedly, checked the Windows log, the error is shown as follows:

Application: Wpfpasswordtest2.exeframework Version: v4.0.30319 Description: The application terminated the process through a System.Environment.FailFast (string message) request. Message: Unrecoverable system error. Stack: in System.Environment.FailFast (System.String) in MS. Internal.Invariant.FailFast (System.String, System.String) in MS. Internal.Invariant.Assert (Boolean) in System.Windows.Media.FontFamily.get_FirstFontFamily () in System.Windows.Media.FontFamily.get_LineSpacing () in System.Windows.Documents.TextSelection.CalculateCaretRectangle (System.Windows.Documents.ITextSelection, System.Windows.Documents.ITextPointer) in System.Windows.Documents.TextSelection.UpdateCaretStateWorker ( System.Object) in System.Windows.Documents.TextSelection.UpdateCaretState ( System.Windows.Documents.CaretScrollMethod) in System.Windows.Documents.TextSelection.EnsureCaret (Boolean, Boolean , System.Windows.Documents.CaretScrollMethod) in System.Windows.Documents.TextSelection.System.Windows.Documents.ITextSelection.UpdateCaretAndHighlight () in System.Windows.Documents.TextEditor.OnGotKEyboardfocus (System.Object, System.Windows.Input.KeyboardFocusChangedEventArgs) in System.Windows.Controls.PasswordBox.OnGotKeyboardFocus (System.Windows.Input.KeyboardFocusChangedEventArgs) in System.Windows.UIElement.OnGotKeyboardFocusThunk (System.Object, System.Windows.Input.KeyboardFocusChangedEventArgs) in System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler (System.Delegate, System.Object) in System.Windows.RoutedEventArgs.InvokeHandler (System.Delegate, System.Object) in System.Windows.RoutedEventHandlerInfo.InvokeHandler (System.Object, System.Windows.RoutedEventArgs) in System.Windows.EventRoute.InvokeHandlersImpl (System.Object, System.Windows.RoutedEventArgs, Boolean) in System.Windows.UIElement.RaiseEventImpl (System.Windows.DependencyObject, System.Windows.RoutedEventArgs) in System.Windows.UIElement.RaiseTrustedEvent (System.Windows.RoutedEventArgs) in System.Windows.UIElement.RaiseEvent (System.Windows.RoutedEventArgs, Boolean) in System.Windows.Input.Inputmanager.processstagingarea () in System.Windows.Input.InputManager.ProcessInput ( System.Windows.Input.InputEventArgs) in System.Windows.Input.KeyboardDevice.ChangeFocus ( System.Windows.DependencyObject, Int32) in System.Windows.Input.KeyboardDevice.TryChangeFocus ( System.Windows.DependencyObject, System.Windows.Input.IKeyboardInputProvider, Boolean, Boolean, Boolean) in System.Windows.Input.KeyboardDevice.Focus (System.Windows.DependencyObject, Boolean, Boolean, Boolean) in System.Windows.Input.KeyboardDevice.Focus (System.Windows.IInputElement) in System.Windows.UIElement.Focus () in System.Windows.Documents.TextEditorMouse.MoveFocusToUiScope (System.Windows.Documents.TextEditor) in System.Windows.Documents.TextEditorMouse.OnMouseDown (System.Object, System.Windows.Input.MouseButtonEventArgs) in System.Windows.Controls.PasswordBox.OnMouseDown (System.Windows.Input.MouseButtonEventArgs) in System.Windows.UIElement.OnMouseDownThunk (System.Object, System.Windows.Input.MouseButtonEveNtargs) in System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler (System.Delegate, System.Object) in System.Windows.RoutedEventArgs.InvokeHandler (System.Delegate, System.Object) in System.Windows.RoutedEventHandlerInfo.InvokeHandler (System.Object, System.Windows.RoutedEventArgs) in System.Windows.EventRoute.InvokeHandlersImpl (System.Object, System.Windows.RoutedEventArgs, Boolean) in System.Windows.UIElement.RaiseEventImpl (System.Windows.DependencyObject, System.Windows.RoutedEventArgs) in System.Windows.UIElement.RaiseTrustedEvent (System.Windows.RoutedEventArgs) in System.Windows.UIElement.RaiseEvent (System.Windows.RoutedEventArgs, Boolean) in System.Windows.Input.InputManager.ProcessStagingArea () in System.Windows.Input.InputManager.ProcessInput (System.Windows.Input.InputEventArgs) in System.Windows.Input.InputProviderSite.ReportInput (System.Windows.Input.InputReport) in System.Windows.Interop.HwndMouseInputProvider.ReportInput (INTPTR, System.Windows.Input.InputMode, Int32, System.Windows.Input.RawMouseActions, Int32, Int32, Int32) in System.Windows.Interop.HwndMouseInputProvider.FilterMessage (IntPtr, MS. Internal.Interop.WindowMessage, IntPtr, IntPtr, Boolean ByRef) in System.Windows.Interop.HwndSource.InputFilterMessage (IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef) in MS. Win32.HwndWrapper.WndProc (IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef) in MS. Win32.HwndSubclass.DispatcherCallbackOperation (System.Object) in System.Windows.Threading.ExceptionWrapper.InternalRealCall (System.Delegate, System.Object, Int32) in MS. Internal.Threading.ExceptionFilterHelper.TryCatchWhen (System.Object, System.Delegate, System.Object, Int32, System.Delegate) in System.Windows.Threading.Dispatcher.LegacyInvokeImpl ( System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32) in MS. Win32.HwndSubclass.SubclassWndProc (IntPtr, Int32, IntPtr, IntPtr) in MS. Win32.unsafenativ

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After the verification, is due to the system font, the specific solution is as follows:

1. Copy all files under C:\Windows\Fonts in a computer that is running the PasswordBox control properly

2. Copy the copied files to C:\Windows\Fonts, prompt to install, select all overwrite the installation.

3. Rerun the program and find that the problem has been resolved.

WPF passwordbox resolution for program exception exit when mouse entry