System.Net.WebException错误处理有关问题

System.Net.WebException异常处理问题
用户代码未处理 System.Reflection.TargetInvocationException
  Message=操作过程中出现异常，结果无效。有关异常的详细信息，请查看 InnerException。
  StackTrace:
       位于 System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
       位于 Silverlight.DBOperationService.ISSelectCompletedEventArgs.get_Result()
       位于 Silverlight.Events.ReportEvents.sys_ISSelect(Object sender, ISSelectCompletedEventArgs e)
       位于 Silverlight.DBOperationService.DBOperationClient.OnISSelectCompleted(Object state)
  InnerException: System.ServiceModel.CommunicationException
       Message=远程服务器返回了错误: NotFound。
       StackTrace:
            位于 System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
            位于 System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
            位于 System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
            位于 System.ServiceModel.ClientBase`1.ChannelBase`1.EndInvoke(String methodName, Object[] args, IAsyncResult result)
            位于 Silverlight.DBOperationService.DBOperationClient.DBOperationClientChannel.EndISSelect(IAsyncResult result)
            位于 Silverlight.DBOperationService.DBOperationClient.Silverlight.DBOperationService.IDBOperation.EndISSelect(IAsyncResult result)
            位于 Silverlight.DBOperationService.DBOperationClient.OnEndISSelect(IAsyncResult result)
            位于 System.ServiceModel.ClientBase`1.OnAsyncCallCompleted(IAsyncResult result)
       InnerException: System.Net.WebException
            Message=远程服务器返回了错误: NotFound。
            StackTrace:
                 位于 System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
                 位于 System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
                 位于 System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult result)
            InnerException: System.Net.WebException
                 Message=远程服务器返回了错误: NotFound。
                 StackTrace:
                      位于 System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
                      位于 System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
                      位于 System.Net.Browser.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)
                 InnerException: 

[解决办法]
反射的错误，还是仔细查查是不是类型不对
[解决办法]

引用:

反射的错误，还是仔细查查是不是类型不对

+1
[解决办法]
遇到此问题 多半是 this.Dispatcher.BeginInvoke((Action)delegate(){}) 大括号中的代码出了异常 如里面访问的数组单元被外部线程清空等 但是vs又捕捉不到

主程序会崩溃 

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