我们正在尝试了解此错误发生的情况，这只是用户与网站断开连接吗？
System.Web.HttpException An error occurred while communicating with the remote host. The error code is 0x800703E3.
System.Runtime.InteropServices.COMException The I/O operation has been aborted because of either a thread exit or an application request.
(Exception from HRESULT: 0x800703E3) StackTrace:
at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
at System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush()
at System.Web.HttpResponse.Flush(Boolean finalFlush)
at System.Web.HttpWriter.WriteFromStream(Byte[] data, Int32 offset, Int32 size)
at System.Web.Mvc.FileStreamResult.WriteFile(HttpResponseBase response)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1c <InvokeActionResultWithFilters>b__19()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
at System.Web.Mvc.Controller.ExecuteCore()
at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext)
at System.Web.Mvc.MvcHandler.<>c__DisplayClass6.<>c__DisplayClassb.<BeginProcessRequest>b__5()
at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()
at System.Web.Mvc.MvcHandler.<>c__DisplayClasse.<EndProcessRequest>b__d()
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
是的，当与用户的连接丢失时会出现此错误。他们可能已关闭浏览器或已断开连接（或请求失败或被取消 https://stackoverflow.com/a/5564892/54804).
类似问题的答案 https://stackoverflow.com/a/1556133/54804建议检查Response.IsClientConnected http://msdn.microsoft.com/en-us/library/system.web.httpresponse.isclientconnected.aspx在调用 Flush() 之前
You 甚至可能不需要显式调用 Flush() https://stackoverflow.com/a/6118977/54804
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