在 MVC 中上传大文件遇到错误

Question

我有一个最大为 2GB 的 .txt 文件，我想将该文件从客户端上传到服务器中的文件夹，在上传该文件时出现错误，这是页面上的内容：

An operation was attempted on a nonexistent network connection. (Exception from HRESULT: 0x800704CD) 
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.Runtime.InteropServices.COMException: An operation was attempted on a nonexistent network connection. (Exception from HRESULT: 0x800704CD)

Source Error: 


 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 



[COMException (0x800704cd): An operation was attempted on a nonexistent network connection. (Exception from HRESULT: 0x800704CD)]

[HttpException (0x80004005): An error occurred while communicating with the remote host. The error code is 0x800704CD.]
   System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect) +3399867
   System.Web.Hosting.IIS7WorkerRequest.ReadEntityCoreSync(Byte[] buffer, Int32 offset, Int32 size) +9621484
   System.Web.Hosting.IIS7WorkerRequest.ReadEntityBody(Byte[] buffer, Int32 size) +24
   System.Web.HttpRequest.GetEntireRawContent() +315
   System.Web.HttpRequest.GetMultipartContent() +63
   System.Web.HttpRequest.FillInFormCollection() +160
   System.Web.HttpRequest.EnsureForm() +69
   System.Web.HttpRequest.get_Form() +13
   System.Web.HttpRequestWrapper.get_Form() +14
   System.Web.Mvc.HttpRequestExtensions.GetHttpMethodOverride(HttpRequestBase request) +121
   System.Web.Mvc.AcceptVerbsAttribute.IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) +37
   System.Web.Mvc.HttpGetAttribute.IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) +39
   System.Web.Mvc.ActionMethodSelectorBase.IsValidMethodSelector(ReadOnlyCollection`1 attributes, ControllerContext controllerContext, MethodInfo method) +54
   System.Web.Mvc.ActionMethodSelectorBase.RunSelectionFilters(ControllerContext controllerContext, List`1 methodInfos) +132
   System.Web.Mvc.ActionMethodSelectorBase.FindActionMethods(ControllerContext controllerContext, String actionName) +142
   System.Web.Mvc.ActionMethodSelectorBase.FindActionMethod(ControllerContext controllerContext, String actionName) +104
   System.Web.Mvc.Async.ReflectedAsyncControllerDescriptor.FindAction(ControllerContext controllerContext, String actionName) +54
   System.Web.Mvc.ControllerActionInvoker.FindAction(ControllerContext controllerContext, ControllerDescriptor controllerDescriptor, String actionName) +16
   System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +114
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +25
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +468
   System.Web.Mvc.Controller.<BeginExecute>b__14(AsyncCallback asyncCallback, Object callbackState, Controller controller) +18
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +20
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +374
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +16
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__3(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +384
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +103
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

这是一些代码：

    public ActionResult UploadFile_Post(FormCollection dt, string btn, HttpPostedFileBase uploadFile, FileUpload dataFile)
    {
      string nameFile, getExtension = "";
      nameFile = System.IO.Path.GetFileNameWithoutExtension(uploadFile.FileName.ToString().Trim()) + "_" + usernm.Trim() + "_" + DateTime.Now.ToString("yyyyMMdd_HHmmss").Trim();
      getExtension = System.IO.Path.GetExtension(uploadFile.FileName.ToString().Trim());

      string FilePath = Server.MapPath("~\\Upload\\" + nameFile + ".txt");
      string pathFile = Server.MapPath("~\\Upload\\");

      if (System.IO.File.Exists(FilePath))
      {
           System.IO.File.Delete(FilePath);                            
      }
      uploadFile.SaveAs(FilePath);//i think failed at this process
   }

在 Web.config 文件中，我已经设置了 maxRequestLength、executionTimeout 和 maxAllowedContentLength 的配置。 也许我的代码是错误的，你们能给我更好的方法来上传这样的文件吗？ 谢谢你， 对不起我的英语不好。

Answer 1

<system.web>
    <httpRuntime executionTimeout="3600" maxRequestLength="102400" 
     appRequestQueueLimit="100" requestLengthDiskThreshold="10024000"/>
</system.web>

executionTimeout : 指定请求在被 ASP.NET 自动关闭之前允许执行的最大秒数。

maxRequestLength : 指定输入流缓冲阈值的限制，单位为 KB

appRequestQueueLimit ：指定 ASP.NET 为应用程序排队的最大请求数。

requestLengthDiskThreshold：指定输入流缓冲阈值的限制，以字节为单位。此值不应超过 maxRequestLength 属性。

更改这些设置，看看会发生什么。知道您正在使用的 IIS 版本也很好。 https://msdn.microsoft.com/en-us/library/e1f13641%28v=vs.100%29.aspx

Answer 2

您永远不应该允许将这么大的文件上传到网络服务器，因为它会占用所有内存并使您的网络服务器崩溃。请记住，当您将文件上传到 Web 服务器时，所有数据都会在尝试写入数据库或文件系统时存储在内存中。对于较大的文件，您需要通过文件流或通过 FTP 上传文件。如果你用谷歌搜索 Jon Galloway，他可能会为你提供一些关于上传大文件的其他方法的答案。