How to implement a file download in ASP.NET AJAX

Question

I would like to use standard ASP.NET file download response, like in other Stack Overflow question.

Response.ContentType = \"application/octet-stream\";
Respo         


        

Answer 1

You can try making a handler for this work.It is more secure if you can modify well. For this work,you need to encrypt file path in your page where you put a link for the file.

Your link to file 
//{0} -> Encrypted file path
//target = _blank force browser to download file in another window

There are lots of encryption techniques in here

In your Handler page, you need to decrypt the file path into original one so you can read it with System.IO libraries.

context.Response.ContentType = ""; //-->MimeType for your file's extension

You can specify your MimeType by Registry unless your mime-type is static as images.

string mimeType = Registry.GetValue(string.Format(@"HKEY_CLASSES_ROOT\.{0}",
                  Path.GetExtension(decryptedfilePath)), "Content Type", null).ToString();

//Then everything is ready for download

byte[] buffer = File.ReadAllBytes(decryptedfilePath);
context.Response.OutputStream.Write(buffer, 0 , buffer.Length);
context.Response.Flush();

Good Luck.