Download Multiple files as zip

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i am trying to download multiple files as ZIP in asp.net

the code is following

C#

var downloadFileName = string.Format(projectno, DateTime.Now.ToString("yyyy-MM-dd-HH_mm_ss"));
                Response.ContentType = "application/zip";
                Response.AddHeader("Content-Disposition", "filename=" + downloadFileName );
                using (var zip = new ZipFile())
                {
                    var readMeMessage = string.Format("Your ZIP file {0} contains the following files:{1}{1}", downloadFileName, Environment.NewLine);
                    foreach (GridViewRow gvr in grdUploads.Rows)
                    if (((CheckBox)gvr.Cells[6].FindControl("dwnldCheck")).Checked == true)
                        {
                            string filename = Server.MapPath("../" + ((Label)gvr.Cells[3].FindControl("lblTitle")).Text);
                            readMeMessage += string.Concat("\t* ", filename, Environment.NewLine);
                            zip.AddFile(filename, projectno);

                        }
                    zip.AddEntry("README.txt", readMeMessage, Encoding.ASCII);
                    zip.Save(Response.OutputStream);
                }

everything is working fine,but its saving as unknown format,not as rar file

please help

Posted 17-May-11 23:03pm

kishore Rajendran

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^That's **Aragon** · Answer 1 · 2011-05-17T23:20:00

You need to add extension in your code after downloadFileName at 3rd line.

C#

var downloadFileName = string.Format(projectno, DateTime.Now.ToString("yyyy-MM-dd-HH_mm_ss"));
        Response.ContentType = "application/zip";
        Response.AddHeader("Content-Disposition", "filename=" + downloadFileName + ".zip");
        using (var zip = new ZipFile())
        {
            var readMeMessage = string.Format("Your ZIP file {0} contains the following files:{1}{1}", downloadFileName, Environment.NewLine);
            foreach (GridViewRow gvr in grdUploads.Rows)
                if (((CheckBox)gvr.Cells[6].FindControl("dwnldCheck")).Checked == true)
                {
                    string filename = Server.MapPath("../" + ((Label)gvr.Cells[3].FindControl("lblTitle")).Text);
                    readMeMessage += string.Concat("\t* ", filename, Environment.NewLine);
                    zip.AddFile(filename, projectno);

                }
            zip.AddEntry("README.txt", readMeMessage, Encoding.ASCII);
            zip.Save(Response.OutputStream);
        }

amit_jain_online · Answer 2 · 2012-04-09T08:35:00

You can do it as mentioned below

<pre lang="c#">ZipFile multipleFilesAsZipFile = new ZipFile();
        Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedZipFile.zip");
        Response.ContentType = "application/zip";
        foreach (ListItem fileName in checkBoxList.Items)
        {
            if (fileName.Selected)
            {
                string filePath = Server.MapPath("~/www.CsharpAspNetArticles.com/" + fileName.Value);
                multipleFilesAsZipFile.AddFile(filePath,string.Empty);
            }
        }
        multipleFilesAsZipFile.Save(Response.OutputStream);

Refer Download Multiple Files As Zip File In Asp.Net for more info

Wayne Gaylard · Answer 3 · 2011-05-17T23:20:00

I fail to see where you are adding the extension .zip to the downloadFileName . One thing I noticed is that you use a lot of var keyword, instead of declaring strong type variables. As far as I am concerned his is bad practice, and should really be avoided, if downloadFileName is a string declare it as such.

Download Multiple files as zip

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