c# - 如何避免 XamlParseException 关闭整个应用程序

Question

我的应用程序是多窗口的。如果发生 XamlParseException，整个应用程序将关闭。

我最多想做的是关闭“负责”此错误的窗口。

你知道实现这一目标的方法吗？

异常示例:

System.Windows.Markup.XamlParseException: Provide value on 'System.Windows.Markup.StaticResourceHolder' threw an exception. ---> System.Exception: Cannot find resource named 'PasteCommandRef'. Resource names are case sensitive.   at System.Windows.StaticResourceExtension.ProvideValueInternal(IServiceProvider serviceProvider, Boolean allowDeferredReference)   at System.Windows.StaticResourceExtension.ProvideValue(IServiceProvider serviceProvider)   at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CallProvideValue(MarkupExtension me, IServiceProvider serviceProvider)   --- End of inner exception stack trace ---   at System.Windows.Markup.XamlReader.RewrapException(Exception e, Uri baseUri)   at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlReader templateReader, XamlObjectWriter currentWriter)   at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlObjectWriter objectWriter)   at System.Windows.FrameworkTemplate.LoadOptimizedTemplateContent(DependencyObject container, IComponentConnector componentConnector, IStyleConnector styleConnector, List`1 affectedChildren, UncommonField`1 templatedNonFeChildrenField)   at System.Windows.FrameworkTemplate.LoadContent(DependencyObject container, List`1 affectedChildren)   at System.Windows.StyleHelper.ApplyTemplateContent(UncommonField`1 dataField, DependencyObject container, FrameworkElementFactory templateRoot, Int32 lastChildIndex, HybridDictionary childIndexFromChildID, FrameworkTemplate frameworkTemplate)   at System.Windows.FrameworkTemplate.ApplyTemplateContent(UncommonField`1 templateDataField, FrameworkElement container)   at System.Windows.FrameworkElement.ApplyTemplate()   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at System.Windows.Controls.Primitives.UniformGrid.MeasureOverride(Size constraint)   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)   at System.Windows.Controls.ItemsPresenter.MeasureOverride(Size constraint)   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at System.Windows.Controls.Border.MeasureOverride(Size constraint)   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at System.Windows.Controls.Control.MeasureOverride(Size constraint)   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)   at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)   at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)   at System.Windows.Controls.Grid.MeasureOverride(Size constraint)   at System.Windows.FrameworkElement.MeasureCore(Size availableSize)   at System.Windows.UIElement.Measure(Size availableSize)   at System.Windows.ContextLayoutManager.UpdateLayout()   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

Answer 1

在您的示例中，应用程序崩溃是因为它找不到您通过 StaticResource 标记扩展静态引用的资源。您是在告诉 WPF，当您寻找该资源时，该资源最好存在。所以它当然会有问题。

要修复您的特定示例(避免找不到资源时出现异常)，您可以更改为使用 DynamicResource 标记扩展。这将告诉 WPF 在查找资源时该资源可能存在，并且 WPF 在为这个示例抛出异常时会更加轻松。

一般来说，您应该始终为 WPF 应用程序提供根级异常处理程序，正如 Wesley 使用 App_HandledExcpetion 方法指出的那样。

但只是盲目地接受 XAMLParseException 会导致您的应用程序出现更多问题，这些问题将难以调试，因为异常会被接受。