How to inetrnet conection disconnet then pause file upload

Question

Dear Sir, we upload more than gb file in folder, when upload file then internet disconnet some milisecond then restart the uploading. how to use wait for connection and resume uploading. it mens connection disconnect then pause uploading and connection estaiblish then resume uploading in MVC. thanks in advance.

Suvendu Shekhar Giri · Answer

Here is a solution I had found in MSDN but not able to get the correct link now. Create a class called "Downloader.cs" with the following content: using System; using System.IO; using System.Text; using System.Web; namespace CSASPNETResumeDownload { public class Downloader { public static void DownloadFile(HttpContext httpContext, string filePath) { if (!IsFileExists(filePath)) { httpContext.Response.StatusCode = 404; return ; } FileInfo fileInfo = new FileInfo(filePath); if (fileInfo.Length > Int32.MaxValue) { httpContext.Response.StatusCode = 413; return ; } // Get the response header information by the http request. HttpResponseHeader responseHeader = GetResponseHeader(httpContext.Request, fileInfo); if (responseHeader == null ) { return ; } FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); try { SendDownloadFile(httpContext.Response, responseHeader, fileStream); } catch (HttpException ex) { httpContext.Response.StatusCode = ex.GetHttpCode(); } finally { fileStream.Close(); } } /// /// Check whether the file exists. /// /// /// private static bool IsFileExists( string filePath) { bool fileExists = false ; if (! string .IsNullOrEmpty(filePath)) { if (File.Exists(filePath)) { fileExists = true ; } } return fileExists; } /// /// Get the response header by the http request. /// /// /// /// private static HttpResponseHeader GetResponseHeader(HttpRequest httpRequest, FileInfo fileInfo) { if (httpRequest == null ) { return null ; } if (fileInfo == null ) { return null ; } long startPosition = 0; string contentRange = "" ; string fileName = fileInfo.Name; long fileLength = fileInfo.Length; string lastUpdateTimeStr = fileInfo.LastWriteTimeUtc.ToString(); string eTag = HttpUtility.UrlEncode(fileName, Encoding.UTF8) + " " + lastUpdateTimeStr; string contentDisposition = "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8).Replace( "+" , "%20" ); if (httpRequest.Headers[ "Range" ] != null ) { string [] range = httpRequest.Headers[ "Range" ].Split( new char [] { '=' , '-' }); startPosition = Convert.ToInt64(range[1]); if (startPosition = fileLength) { return null ; } } if (httpRequest.Headers[ "If-Range" ] != null ) { if (httpRequest.Headers[ "If-Range" ].Replace( "\"" , "" ) != eTag) { startPosition = 0; } } string contentLength = (fileLength - startPosition).ToString(); if (startPosition > 0) { contentRange = string .Format( " bytes {0}-{1}/{2}" , startPosition, fileLength - 1, fileLength); } HttpResponseHeader responseHeader = new HttpResponseHeader(); responseHeader.AcceptRanges = "bytes" ; responseHeader.Connection = "Keep-Alive" ; responseHeader.ContentDisposition = contentDisposition; responseHeader.ContentEncoding = Encoding.UTF8; responseHeader.ContentLength = contentLength; responseHeader.ContentRange = contentRange; responseHeader.ContentType = "application/octet-stream" ; responseHeader.Etag = eTag; responseHeader.LastModified = lastUpdateTimeStr; return responseHeader; } /// /// Send the download file to the client. /// /// /// /// private static void SendDownloadFile(HttpResponse httpResponse, HttpResponseHeader responseHeader, Stream fileStream) { if (httpResponse == null || responseHeader == null ) { return ; } if (! string .IsNullOrEmpty(responseHeader.ContentRange)) { httpResponse.StatusCode = 206; // Set the start position of the reading files. string [] range = responseHeader.ContentRange.Split( new char [] { ' ' , '=' , '-' }); fileStream.Position = Convert.ToInt64(range[2]); } httpResponse.Clear(); httpResponse.Buffer = false ; httpResponse.AppendHeader( "Accept-Ranges" , responseHeader.AcceptRanges); httpResponse.AppendHeader( "Connection" , responseHeader.Connection); httpResponse.AppendHeader( "Content-Disposition" , responseHeader.ContentDisposition); httpResponse.ContentEncoding = responseHeader.ContentEncoding; httpResponse.AppendHeader( "Content-Length" , responseHeader.ContentLength); if (! string .IsNullOrEmpty(responseHeader.ContentRange)) { httpResponse.AppendHeader( "Content-Range" , responseHeader.ContentRange); } httpResponse.ContentType = responseHeader.ContentType; httpResponse.AppendHeader( "Etag" , "\"" + responseHeader.Etag + "\"" ); httpResponse.AppendHeader( "Last-Modified" , responseHeader.LastModified); Byte[] buffer = new Byte[10240]; long fileLength = Convert.ToInt64(responseHeader.ContentLength); // Send file to client. while (fileLength > 0) { if (httpResponse.IsClientConnected) { int length = fileStream.Read(buffer, 0, 10240); httpResponse.OutputStream.Write(buffer, 0, length); httpResponse.Flush(); fileLength = fileLength - length; } else { fileLength = -1; } } } } /// /// Respresent the HttpResponse header information. /// class HttpResponseHeader { public string AcceptRanges { get ; set ;} public string Connection { get ; set ; } public string ContentDisposition { get ; set ; } public Encoding ContentEncoding { get ; set ; } public string ContentLength { get ; set ; } public string ContentRange { get ; set ; } public string ContentType { get ; set ; } public string Etag { get ; set ; } public string LastModified { get ; set ; } } } and then replace following content in "DownloadHttpHandler.ashx.cs file using System; using System.Configuration; using System.Web; namespace CSASPNETResumeDownload { public class DownloadHttpHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { string filePath = ConfigurationManager.AppSettings[ "FilePath" ]; Downloader.DownloadFile(context, filePath); } public bool IsReusable { get { return false ; } } } } See if it still works, else let me know.