Question

我希望StackOverflow上的某个人可以帮我解决以下问题：

我有一个WP7.1项目，我使用VS2012打开。另外，我启用了Common Language Runtime Exceptions。通过这样做，我想捕获并修复代码中可能存在的大多数错误。

在模拟器中运行项目时，我遇到以下例外情况：

System.Reflection.TargetInvocationException occurred
  Message=TargetInvocationException
  StackTrace:
       at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark)
       at System.Reflection.RuntimePropertyInfo.InternalGetValue(PropertyInfo thisProperty, Object obj, Object[] index, StackCrawlMark& stackMark)
       at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
       at System.Windows.CLRPropertyListener.get_Value()
       at System.Windows.PropertyAccessPathStep.ConnectToPropertyInSource(Boolean isSourceCollectionViewCurrentItem)
       at System.Windows.PropertyAccessPathStep.ConnectToProperty()
       at System.Windows.PropertyAccessPathStep.ReConnect(Object newSource)
       at System.Windows.PropertyPathListener.ReConnect(Object source)
       at System.Windows.Data.BindingExpression.SourceAcquired()
       at System.Windows.Data.BindingExpression.TargetLoaded(Object o, RoutedEventArgs e)
       at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
       at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
  InnerException: System.InvalidOperationException
       Message=InvalidOperationException
       StackTrace:
            at System.Windows.Duration.get_TimeSpan()
            at System.Reflection.RuntimeMethodInfo.InternalInvoke(RuntimeMethodInfo rtmi, Object obj, BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess, StackCrawlMark& stackMark)
            at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark)
            at System.Reflection.RuntimePropertyInfo.InternalGetValue(PropertyInfo thisProperty, Object obj, Object[] index, StackCrawlMark& stackMark)
            at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
            at System.Windows.CLRPropertyListener.get_Value()
            at System.Windows.PropertyAccessPathStep.ConnectToPropertyInSource(Boolean isSourceCollectionViewCurrentItem)
            at System.Windows.PropertyAccessPathStep.ConnectToProperty()
            at System.Windows.PropertyAccessPathStep.ReConnect(Object newSource)
            at System.Windows.PropertyPathListener.ReConnect(Object source)
            at System.Windows.Data.BindingExpression.SourceAcquired()
            at System.Windows.Data.BindingExpression.TargetLoaded(Object o, RoutedEventArgs e)
            at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
            at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

和

System.InvalidOperationException occurred
  Message=InvalidOperationException
  StackTrace:
       at System.Windows.Duration.get_TimeSpan()
       at System.Reflection.RuntimeMethodInfo.InternalInvoke(RuntimeMethodInfo rtmi, Object obj, BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess, StackCrawlMark& stackMark)
       at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark)
       at System.Reflection.RuntimePropertyInfo.InternalGetValue(PropertyInfo thisProperty, Object obj, Object[] index, StackCrawlMark& stackMark)
       at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
       at System.Windows.CLRPropertyListener.get_Value()
       at System.Windows.PropertyAccessPathStep.ConnectToPropertyInSource(Boolean isSourceCollectionViewCurrentItem)
       at System.Windows.PropertyAccessPathStep.ConnectToProperty()
       at System.Windows.PropertyAccessPathStep.ReConnect(Object newSource)
       at System.Windows.PropertyPathListener.ReConnect(Object source)
       at System.Windows.Data.BindingExpression.SourceAcquired()
       at System.Windows.Data.BindingExpression.TargetLoaded(Object o, RoutedEventArgs e)
       at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
       at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
       at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex,
 String eventName)

显然两个例外都是相互关联的，因为它们是一个接一个地抛出并包含相同的内部异常。

在抛出这些异常的页面上，我使用WPToolkit和一些自定义控件。 Just LoopingSelector使用Duration结构。但我认为LoopingSelector的代码没有错。

有人可以指出寻找错误的方向吗？ XAML绑定？铸造？

Answer 1

似乎我能够找到解决这个问题的方法。

在某些情况下， SSME.NaturalDuration.TimeSpan 可以为null。对于这些情况， NaturalDuration 属性具有标志 HasTimeSpan ，当无法检索TimeSpan值时，该标志返回false。

所以，我将绑定逻辑移到了代码后面。我在设置绑定之前总是检查 SSME.NaturalDuration.HasTimeSpan 。

公共语言运行时异常捕获

1 个答案: