ASP NET file download from server

Question

After a user clicks a button  I want a file to be downloaded  I ve tried the following which seems to work  but not without throwing an exception  ThreadAbort  which is not acceptable       System Web HttpResponse response   System Web HttpContext Current Response      response ClearContent        response Clear        response ContentType    text plain       response AddHeader  Content-Disposition    attachment  filename     fileName             response TransmitFile Server MapPath  FileDownload csv         response Flush        response End

User · Answer

protected void DescargarArchivo string strRuta  string strFile        FileInfo ObjArchivo   new System IO FileInfo strRuta       Response Clear        Response AddHeader  Content-Disposition    attachment  filename     strFile       Response AddHeader  Content-Length   ObjArchivo Length ToString         Response ContentType    application pdf       Response WriteFile ObjArchivo FullName       Response End

User · Answer

You can use an HTTP Handler   ashx  to download a file  like this   DownloadFile ashx   public class DownloadFile   IHttpHandler        public void ProcessRequest HttpContext context                   System Web HttpResponse response   System Web HttpContext Current Response          response ClearContent            response Clear            response ContentType    text plain           response AddHeader  Content-Disposition                                attachment  filename     fileName                 response TransmitFile Server MapPath  FileDownload csv             response Flush                response End               public bool IsReusable               get                       return false                      Then you can call the HTTP Handler from the button click event handler  like this   Markup    lt asp Button ID  btnDownload  runat  server  Text  Download File               OnClick  btnDownload Click   gt    Code-Behind   protected void btnDownload Click object sender  EventArgs e        Response Redirect  PathToHttpHandler DownloadFile ashx          Passing a parameter to the HTTP Handler   You can simply append a query string variable to the Response Redirect    like this   Response Redirect  PathToHttpHandler DownloadFile ashx yourVariable yourValue      Then in the actual handler code you can use the Request object in the HttpContext to grab the query string variable value  like this   System Web HttpRequest request   System Web HttpContext Current Request  string yourVariableValue   request QueryString  yourVariable        Use the yourVariableValue here   Note - it is common to pass a filename as a query string parameter to suggest to the user what the file actually is  in which case they can override that name value with Save As

User · Answer

Try this set of code to download a CSV file from the server   byte   Content  File ReadAllBytes FilePath     missing   Response ContentType    text csv   Response AddHeader  content-disposition    attachment  filename     fileName     csv    Response BufferOutput   true  Response OutputStream Write Content  0  Content Length   Response End

User · Answer

Making changes as below and redeploying on server content type as   Response ContentType    application octet-stream     This worked for me    Response Clear     Response AddHeader  Content-Disposition    attachment  filename     file Name    Response AddHeader  Content-Length   file Length ToString      Response ContentType    application octet-stream    Response WriteFile file FullName    Response End

User · Answer

Further to Karl Anderson solution  you could put your parameters into session information and then clear them after response TransmitFile Server MapPath  Session currentSessionItemName       See MSDN page HttpSessionState Add Method  String  Object  for more information on sessions

User · Answer

Simple solution for downloading a file from the server   protected void btnDownload Click object sender  EventArgs e                        string FileName    Durgesh jpg      It s a file name displayed on downloaded file on client side               System Web HttpResponse response   System Web HttpContext Current Response              response ClearContent                response Clear                response ContentType    image jpeg               response AddHeader  Content-Disposition    attachment  filename     FileName                     response TransmitFile Server MapPath    File 001 jpg                 response Flush                response End

[c#] ASP.NET file download from server

Examples related to c#

Examples related to asp.net