Downloading Multiple Files as a Zip File Using GridView[Answered] RSS

• • Reply
  Edward Sheri...

  Member

  27 Points

  40 Posts

  Downloading Multiple Files as a Zip File Using GridView

  Feb 11, 2021 10:06 PM|Edward Sheriff Curtis|LINK

  Hello there,

  This is my table on MySQL database.

  +----+----------------------------------+---------------------------------+----------------------------------+---------------------------------+
  | ID | xls                              | img                             | ppt                              | pdf                             |
  +----+----------------------------------+---------------------------------+----------------------------------+---------------------------------+
  |  1 | c:\inetpub\wwwroot\xls\test.xlsx | c:\inetpub\wwwroot\img\test.jpg | c:\inetpub\wwwroot\ppt\test.pptx | c:\inetpub\wwwroot\pdf\test.pdf |
  +----+----------------------------------+---------------------------------+----------------------------------+---------------------------------+
  

  I need publish the values of this table on gridview using asp net and c#

  Would it be possible to provide a single download button in the gridview and download a single zip file that joins the individual four files of row number one of the table?

  Thanks in advance for any help.

• • Reply
  yij sun

  Contributor

  3730 Points

  1431 Posts

  Re: Downloading Multiple Files as a Zip File Using GridView

  Feb 12, 2021 06:56 AM|yij sun|LINK

  Hi Edward Sheriff Curtis,

  As far as I think,you could install SharpZipLib . More details,you could refer to below this:

   <asp:GridView ID="griddownload" runat="server" AutoGenerateColumns="false" AlternatingRowStyle-BackColor="#99ccff" HeaderStyle-BackColor="#000099" HeaderStyle-ForeColor="White">
                  <Columns>
                      <asp:TemplateField HeaderText="check the check box to download the files">
                          <ItemTemplate>
                              <asp:CheckBox ID="chkselect" runat="server" />
                          </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="File Name">
                          <ItemTemplate>
                              <asp:Label ID="lblFileName" runat="server" Text='<%# Eval("FileName") %>' />
                              <asp:Label ID="lblFilePath" Visible="false" runat="server" Text='<%# Eval("FilePath") %>' />
                          </ItemTemplate>
                      </asp:TemplateField>
                  </Columns>
              </asp:GridView>
          </div>
          <asp:Button runat="server" ID="button1" OnClick="button1_Click" />

  Code-behind:

   private void bindgrid()
          {
              var files = Directory.GetFiles(Server.MapPath("~/Zipped File"));
  
              griddownload.DataSource = from f in files
                                        select new
                                        {
                                            FileName = Path.GetFileName(f),
                                            FilePath = f
                                        };
              griddownload.DataBind();
          }
          protected void Page_Load(object sender, EventArgs e)
          {
              if (!Page.IsPostBack)
              {
                  bindgrid();
              }
          }
  
          protected void button1_Click(object sender, EventArgs e)
          {
              byte[] buffer = new byte[6144];
              var filedownload = Server.MapPath(@"tempfolder/" + Guid.NewGuid().ToString() + ".zip");
  
              var zipOutputStream = new ZipOutputStream(File.Create(filedownload));
              var filePath = String.Empty;
              var fileName = String.Empty;
              var readBytes = 0;
  
              foreach (GridViewRow row in griddownload.Rows)
              {
                  var isChecked = (row.FindControl("cboxselect") as CheckBox).Checked;
                  if (!isChecked) continue;
                  fileName = (row.FindControl("lblfname") as Label).Text;
                  filePath = (row.FindControl("lblpath") as Label).Text;
                  var addzipfile = new ZipEntry(fileName);
  
                  zipOutputStream.PutNextEntry(addzipfile);
  
                  using (var fs = File.OpenRead(filePath))
                  {
                      do
                      {
                          readBytes = fs.Read(buffer, 0, buffer.Length);
                          zipOutputStream.Write(buffer, 0, readBytes);
  
                      } while (readBytes > 0);
                  }
              }
  
              if (zipOutputStream.Length == 0)
              {
                  lblMessage.Text = "First check minimum one check box then download!!!";
                  return;
              }
  
              zipOutputStream.Finish();
              zipOutputStream.Close();
              Response.ContentType = "application/x-zip-compressed";
              Response.AppendHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip");
              Response.WriteFile(filedownload);
              Response.Flush();
              Response.Close();
              if (File.Exists(filedownload))
         }

  More details,you could refer to below article:

  https://www.c-sharpcorner.com/UploadFile/66489a/download-multiple-file-through-grid-view-in-a-single-zipped/

  Best regards,

  Yijing Sun

  .NET forums are moving to a new home on Microsoft Q&A, we encourage you to go to Microsoft Q&A for .NET for posting new questions and get involved today.