Download PDF file from a Directory Listing

Question

I have used a Gridview Control to display the contents of a directory in asp.net webforms.

The contents are filtered to display only PDF files.

I also have a Button inside a TemplateField. On the click of the button the user should be able to download and save the PDF file.

The columns displayed in the Gridview are File Name, Modified Date and Size.

How can I program the Button click to download and save the PDF file?

Answer 1

I have a function that performs a file download.

public static void DownloadFile(string FilePath, System.Web.HttpResponse response)
{
    System.IO.FileInfo file = new System.IO.FileInfo(FilePath);
    if ((file.Exists))
    {
        response.Clear();
        response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
        response.AddHeader("Content-Length", file.Length.ToString());
        response.ContentType = "application/octet-stream";
        response.WriteFile(file.FullName);
        response.End();
        response.Close();
        file = null;
    }
}

The FilePath parameter is the physical path, so if you have the virtual path (e.g. ~/Folder/file.pdf) might need to use the Server.MapPath(...) function to call the function.

Answer 2

In your Button click event, write the following code.

protected void Button1_Click(object sender, EventArgs e) 
{ 
    Response.ContentType = "Application/pdf"; 
    Response.AppendHeader("Content-Disposition", "attachment; filename=Your_Pdf_File.pdf"); 
    Response.TransmitFile(Server.MapPath("~/Files/Your_Pdf_File.pdf"));
    Response.End(); 
}