I need send a file from server to browser (web client)

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But while download file, the program continue execution.

C#

//Create a WebRequest to get the file
            FileWebRequest fileReq = (FileWebRequest)FileWebRequest.Create(this.CaminhoCompleto);

            //Create a response for this request
            FileWebResponse fileResp = (FileWebResponse)fileReq.GetResponse();

            if (fileReq.ContentLength > 0)
                fileResp.ContentLength = fileReq.ContentLength;

            //Get the Stream returned from the response
            stream = fileResp.GetResponseStream();


            // prepare the response to the client. resp is the client Response
            HttpResponse resp = HttpContext.Current.Response;

            

            //ERRO!!!
            teste(stream, resp, fileResp);


            string nomeArq = fileResp.ResponseUri.Segments[(fileResp.ResponseUri.Segments.Length) - 1];

            //Indicate the type of data being sent
            resp.ContentType = "application/octet-stream";

            //Name the file 
            resp.AddHeader("Content-Disposition", "attachment; filename=\"" + nomeArq + "\"");
            resp.AddHeader("Content-Length", fileResp.ContentLength.ToString());

            //await stream.CopyToAsync(resp.OutputStream);

Posted 6-Jun-14 4:21am

Yitzhak Stone

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ZurdoDev 6-Jun-14 10:54am

Call a webservice from JavaScript (jquery .ajax) and do it that way.

Prasad Khandekar 6-Jun-14 11:42am

Hello Yitzhak,

From your web client use Window.Open(DOWNLOAD_URL, "_blank"). Where DOWNLOAD_URL is the URL for page which servers the content (the page in which the above mentioned code resides).

Regards,

Yitzhak Stone 6-Jun-14 13:04pm

Unfortunately this does not give way, because the files need permission to be downloaded, so it can not be by URL.

Prasad Khandekar 9-Jun-14 2:05am

Well the download page is going to perform that check isn't it. The user must be first authenticating to the website.

Regards,

Yitzhak Stone 9-Jun-14 6:59am

Once you have the URL, the entire audience will access it, logged or not logged into the site.

Prasad Khandekar 10-Jun-14 8:13am

URL will be a fixed url say download.aspx. It will receive a parameter say file_id which will allow server side code to locate the associated file with it. The download.aspx will always perform checks like whether the user is authenticated and optionally whether the user has access to the requested file. The download.aspx will then read the file contents and stream it back with Content-Disposition header. This will allow the browser to present the save as file dialog.

Regards,

Rob Philpott 9-Jun-14 4:56am

Please give an example of the format of url you are using. Why are you using FileWebRequest rather than HttpWebRequest?

Yitzhak Stone 9-Jun-14 6:58am

D:\files\file.doc (the file is on a file server).

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Dusara Maulik · Answer 1 · 2014-06-09T02:33:00

Review my code below:

protected void btnDowmLoad_Click(object sender, EventArgs e)
{
    try
    {
        string strURL=txtFileName.Text;
        WebClient req=new WebClient();
        HttpResponse response = HttpContext.Current.Response;
        response.Clear();
        response.ClearContent();
        response.ClearHeaders();
        response.Buffer= true;
        response.AddHeader("Content-Disposition","attachment;filename=\"" + Server.MapPath(strURL) + "\"");
        byte[] data=req.DownloadData(Server.MapPath(strURL));
        response.BinaryWrite(data);
        response.End();
    }
    catch(Exception ex)
    {
     }
}