ASP.NET add a httphandler to edit downloaded file name

Question

I have in my project a page DownloadDocument.aspx and it's codebhind is DownloadDocument.aspx.cs

In my DownloadDocument.aspx i have an anchor which take a dynamic link like this:

<a id="downloadLink" runat="server"  style="margin:5px" 
href="<%# CONTENT_DIRECTORY_ROOT + document.Path %>">Download current file</a>

I want to add a httphandler to control the file name downloaded, How can i do it? Thanks in advance.

score 16 · Accepted Answer · answered Sep 09 '12 at 16:20

How about using a generic handler (.ashx) for this?

You need to add loading specific information, like filename, contenttyp and the content itself. The sample should give you a good headstart.

public class GetDownload : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        if (!string.IsNullOrEmpty(context.Request.QueryString["IDDownload"]))
        {
                context.Response.AddHeader("content-disposition", "attachment; filename=mydownload.zip");
                context.Response.ContentType = "application/octet-stream";
                byte[] rawBytes = // Insert loading file with IDDownload to byte array
                context.Response.OutputStream.Write(rawBytes, 0, rawBytes.Length);
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

The generic handler is called from a URL, like this:

<a href="/GetDownload.ashx?IDDownload=1337">click here to download</a>

Mayank Pathak · Answer 2 · 2012-09-07T13:24:35.680

3

it depends on type of file you are trying to download...because every request is gone through HTTPHandler's ProcessRequest. and it's checks each and every request one by one.. You need to add any HTTPHandler to your project and need to add something like this in your web.config.

 <httpHandlers>
  <add path="*.jpg,*.jpeg,*.bmp,*.tif,*.tiff" verb="*" type="NameofYourHandler" />
</httpHandlers>

This will check your request for every Image type.. mentioned in path attribute

Edit :

<add verb="*" path="*DownloadDocument.aspx " type="NameofYourHandler"/>

edited Sep 07 '12 at 13:24

answered Sep 07 '12 at 13:13

Mayank Pathak

3,621
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i want it to support any file extention – Vervatovskis Sep 07 '12 at 13:15
see edit section...this will register your handler for your download page, for every request regardless of file types.. – Mayank Pathak Sep 07 '12 at 13:25
excuse Mayank, in the type i just put the handler name or the full path of the handler (i am new in .NET environment) – Vervatovskis Sep 07 '12 at 13:47
i still can't do it :( is there a link for a full example project? – Vervatovskis Sep 07 '12 at 13:54
For more info read these links http://msdn.microsoft.com/en-us/library/46c5ddfy(v=vs.71).aspx, http://msdn.microsoft.com/en-us/library/46c5ddfy(v=vs.100).aspx – Mayank Pathak Sep 07 '12 at 14:02
In fact i don't now where to start... i haven't understand the concept [link](https://twitter.com/vervatovskis) – Vervatovskis Sep 07 '12 at 14:25

score 0 · Answer 3 · answered Sep 07 '12 at 13:16

0

You can try with this code

<httpHandlers>
  <add 
   verb="POST"  
   path="*.jpg,*.jpeg,*.bmp,*.tif,*.tiff" 
   type="YourHandler" />
</httpHandlers>

answered Sep 07 '12 at 13:16

Aghilas Yakoub

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ASP.NET add a httphandler to edit downloaded file name

3 Answers3

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