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Download link

Hi,

The following code displays a download link in a datagridView control and it's working. How can modify the code to remove the hyperlink if no file is available?

 protected void grdProjects_RowCommand (object sender, GridViewCommandEventArgs e)
   {
       string name = e.CommandArgument.ToString ();
       string fullFilePath = Server.MapPath (name);
          System.IO.FileInfo fileInfo = new System.IO.FileInfo (fullFilePath);
          this.Response.Clear ();
          this.Response.AddHeader ("Content-Disposition", "attachment; filename=" + fileInfo.Name);
          this.Response.AddHeader ("Content-Length", fileInfo.Length.ToString ());
          this.Response.ContentType = "application/octet-stream";
          //this.Response.TransmitFile(fileInfo.FullName);
          this.Response.BinaryWrite (File.ReadAllBytes (fileInfo.FullName));
          this.Response.End ();
   }

html
       <Columns>
          <asp:TemplateField HeaderText="Misc-Doc">
              <ItemTemplate>
                  <asp:LinkButton ID="btnItemName6" runat="server" Text='View' CommandArgument='<%# Eval("md") %>'
                     Font-Underline="false" ForeColor="black" CssClass="linkbutton" CommandName="OpenFile" />
              </ItemTemplate>
          </asp:TemplateField>

Please help.

ayha
0
ayha1999
Asked:
ayha1999
1 Solution
 
dj_alikCommented:
protected void grdProjects_RowCommand (object sender, GridViewCommandEventArgs e)
   {
...................... 

if(!File.Exists(fullFilePath ))
{
int rowIndex = ((e.CommandSource as LinkButton).NamingContainer as GridViewRow).RowIndex;
                for (int i = 0; i < grdProjects.Rows.Count; i++)
                {
                        if (i != rowIndex)
                                (grdProjects.Rows[i].FindControl("LinkButtonStop") as LinkButton).Enabled = false;
                }
}
}

Open in new window

0
 
Luis PérezSoftware Architect in .NetCommented:
Try this:

       string name = e.CommandArgument.ToString ();
       string fullFilePath = Server.MapPath (name);
        if(System.IO.File.Exists(fullFilePath)) {
              System.IO.FileInfo fileInfo = new System.IO.FileInfo (fullFilePath);
              this.Response.Clear ();
              this.Response.AddHeader ("Content-Disposition", "attachment; filename=" + fileInfo.Name);
              this.Response.AddHeader ("Content-Length", fileInfo.Length.ToString ());
              this.Response.ContentType = "application/octet-stream";
              //this.Response.TransmitFile(fileInfo.FullName);
              this.Response.BinaryWrite (File.ReadAllBytes (fileInfo.FullName));
              this.Response.End ();
        }

Hope that helps.
0
 
Mihai StancescuSoftware Engineer Commented:
Hi,

Try adding the visible property for the link button like this:

Visible='<%# Eval("<file_Filed_from_DB>").ToString() != "" %>' if you return an empty string from the query when there is no file present to download.


Regards,
Mishu
0
 
Monica PSoftware DeveloperCommented:
code to remove the hyperlink if no file is available

grdProjects_RowCommand


before assigning the filelocation

check the file exist in the current location  ,if exits assign hyperlink else
use FINDCONTROL and make that hyperlink control readyonly or visible as none

If File.Exists("C:\MyDocs\MyFile.txt") = False Then
   MsgBox("Field does not exist!", MsgBoxStyle.Critical, "File Not Found")
   Application.Exit()
End If

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http://www.brangle.com/wordpress/2009/08/check-if-file-exists-wit-vb-net/
0
 
ayha1999Author Commented:
Thanks
0

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