How to download multiple files and create zip file from those files in ASP.NET C#

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Hi,
I want to download multiple files from Application folder and create zip file.
For that i have used checklist to show list of files that folder have .So can download only selected files and create zip for same.
following code i have tried..

What I have tried:

Code in page load to create checkboxlist as follows

if (!IsPostBack)
            {
                //DirectoryInfo dir = new DirectoryInfo(Server.MapPath(@"D:/PDFFiles/"));
                DirectoryInfo dir = new DirectoryInfo(@"D:/PDFFiles/");

                FileInfo[] files = dir.GetFiles();

                foreach (FileInfo file in files)
                {
                    string fileName = Path.GetFileName(file.ToString());
                    ListItem item = new ListItem(fileName);
                    cblFiles.Items.Add(item);
                }
                Response.Write("<script LANGUAGE='JavaScript' >alert('" + files.Length + " Files found')</script>");
            }

code on download button click

protected void Button1_Click(object sender, EventArgs e)
        {
            if (cblFiles.SelectedItem == null)
            {
                // No options selected!
                Response.Write("<script LANGUAGE='JavaScript' >alert('You must select one or more files to download.')</script>");
                //base.DisplayAlert("You must select one or more files to download.");
                return;
            }
           
            var downloadFileName = string.Format("YourDownload-{0}.zip", DateTime.Now.ToString("yyyy-MM-dd-HH_mm_ss"));
            Response.ContentType = "application/zip";
            Response.AddHeader("Content-Disposition", "filename=" + downloadFileName);
     

        // Zip the contents of the selected files
        using (ZipFile zip = new ZipFile())
        {
            // Add the password protection, if specified
            if (!string.IsNullOrEmpty(txtZIPPassword.Text))
            {
                zip.Password = txtZIPPassword.Text;
                zip.Encryption = EncryptionAlgorithm.WinZipAes128;
            }      
            var readMeMessage = string.Format("Your ZIP file {0} contains the following files:{1}{1}", downloadFileName, Environment.NewLine);


            // Add the checked files to the ZIP
            foreach (ListItem li in cblFiles.Items)
                if (li.Selected)
                {
                    // Record the file that was included in readMeMessage
                    readMeMessage += string.Concat("\t* ", li.Text, Environment.NewLine);

                    // Now add the file to the ZIP (use a value of "" as the second parameter to put the files in the "root" folder)
                    zip.AddFile(li.Value, "Your Files");
                }
          
                    // Add the README.txt file to the ZIP
            zip.AddEntry("README.txt", readMeMessage, Encoding.ASCII);


            // Send the contents of the ZIP back to the output stream
            //zip.Save(downloadFileName);
            zip.Save(Response.OutputStream);
            Response.Close();
        }
        }

but not working for me when i click on dowload button click it shows exception like
FileNotFoundException at

C:\\Program Files\\Common Files\\Microsoft Shared\\DevServer\\10.0\\BLWRM0032016-17.pdf":null}

Please give mi solution
thanks

Posted 4-Apr-17 19:19pm

SujataJK

Updated 16-Apr-18 11:06am

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Karthik_Mahalingam · Answer 1 · 2017-04-04T20:16:00

Solution 1

You are not adding the File path to the ListItem and trying to get the path from Value property,

try adding the path to the checkbox list Item's Value prperty

foreach (FileInfo file in files)
                {
                    string fileName = Path.GetFileName(file.ToString());
                    ListItem item = new ListItem(fileName,file.FullName); // set the path in value property 
                    cblFiles.Items.Add(item);
                }

Since the path is not specified, it will look into the machine default location and of-course the file is not present over there, which results in FileNotFoundException

Posted 4-Apr-17 20:16pm

Karthik_Mahalingam

Updated 4-Apr-17 20:19pm

v2

Comments

SujataJK 5-Apr-17 3:03am

Thanks @Karthik
but iterate foreach like this
DirectoryInfo dir = new DirectoryInfo(@"D:/PDFFiles/");

FileInfo[] files = dir.GetFiles();

foreach (FileInfo file in files)
{
string fileName = Path.GetFileName(file.ToString());
ListItem item = new ListItem(fileName);
cblFiles.Items.Add(item);
}

Here files is FileInfo[] type array ND I have added directory files to files .So i have path na

Karthik_Mahalingam 5-Apr-17 3:09am

it will have only the file name, not the full path.

SujataJK 5-Apr-17 4:23am

yes yes u are correct.I will check your above solution

Karthik_Mahalingam 5-Apr-17 4:26am

ok fine.

SujataJK 5-Apr-17 4:38am

i tried but not working for me
when print file.FullName in looks like
D:SujataWebApplicationZipFileDemoZipFileDemoDownloadLibraryPBLWRM0000116-17.pdf
instead of
D:\Sujata\WebApplication\ZipFileDemo\ZipFileDemo\DownloadLibrary\PBLWRM0000116-17.pdf

Karthik_Mahalingam 5-Apr-17 4:39am

how come ?
can u post a screenshot?

SujataJK 5-Apr-17 4:51am

i just use
response.write("alert('"+file.FullName+"')")

Karthik_Mahalingam 5-Apr-17 4:52am

keep a break point and check

SujataJK 7-Apr-17 2:24am

hey i solve my issue just little change in above code i.e
List<listitem> files = new List<listitem>();
f (!this.IsPostBack)
{
string[] filePaths = Directory.GetFiles(Server.MapPath("~/Files/"));

foreach (string filePath in filePaths)
{
files.Add(new ListItem(Path.GetFileName(filePath), filePath));
}
}

it works for me

Karthik_Mahalingam 7-Apr-17 2:26am

cool, if works please close this post.

Lay_Kay · Answer 2 · 2018-04-16T11:07:00

Hi Karthik!

Does NOT work for me. I am getting this DataBinding error message when I tried your code. Can you please help? See my code, below.

DataBinding: 'System.Web.UI.WebControls.ListItem' does not contain a property with the name....

protected void Page_Load(object sender, EventArgs e) 
{

  if (!IsPostBack)
  {

    string[] filePaths = Directory.GetFiles(Server.MapPath("../Files/"));
    List<listitem> files = new List<listitem>(); 


    foreach (string filePath in filePaths)
    {
        files.Add(new ListItem(Path.GetFileName(filePath), filePath));
        // string fileName = Path.GetFileName(files.ToString());

     }

      FileGrid.DataSource = files;
      FileGrid.DataBind(); // this line is giving me the problem.
  }

}