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I'm trying to create in asp.net 2.0 a web service to download a file (pop up window with Open or Save the file), in this way:

$.ajax({ type: "POST", url: "webservice.asmx/download", data: "{}", contentType: "application/json; charset=utf-8", success: function (res) { console.log("donwloaded"); } });

And in "webservice.asmx"

[WebMethod()] public byte[] DownloadFile(string FName) { System.IO.FileStream fs1 = null; fs1 = System.IO.File.Open(FName, FileMode.Open, FileAccess.Read); byte[] b1 = new byte[fs1.Length]; fs1.Read(b1, 0, (int)fs1.Length); fs1.Close(); return b1; } [WebMethod] public void download() { string filename = "test.txt"; string path = "C:\\test.txt"; byte[] ls1 = DownloadFile(path); HttpResponse response = Context.Response; response.Clear(); response.BufferOutput = true; response.ContentType = "application/octet-stream"; response.ContentEncoding = Encoding.UTF8; response.AppendHeader("content-disposition", "attachment; filename=" + filename); response.BinaryWrite(ls1); response.Flush(); response.Close(); }

In this way I see the contents of the file (I can't to download the file whith a popup window).

Where I wrong? Is it possible to do this?

thanks in advance

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  • You would have to open a new window and invoke this ajax part in that new window. Commented Sep 20, 2013 at 15:48
  • 1
    I think the content type is different for a file in order to appear as a downloadable. Commented Sep 20, 2013 at 15:54
  • Sorry, but I don't understand what you mean. Actually the ajax call is in click event on aspx page....(for "popup window" I mean the default confirm window of the browser) Commented Sep 20, 2013 at 15:57
  • Oh ok .. I think then popu part is working for you. For the above part , I was telling to open a blank URL with the above JS pasted but you can ignore that. Quite interesting , haven't tried AJAX requests for file downloading , not sure if An AJAX response can come in different contenttype Commented Sep 20, 2013 at 16:02
  • I think the answer in to this question might help stackoverflow.com/questions/16670209/… Commented Sep 20, 2013 at 16:05

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that is not a good way , to make file download thru popup window , just open a new pop and make the url of that window to point to your file or webservice url . 

window.open("fileurl" )
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a good way to do it is simply redirect the browser to the "webservice.asmx/download" instead of calling that via ajax. i.e.

window.location.href = 'webservice.asmx/download';

when browser will detect you returning octet-stream, it will ask to download the file but will not clear/eraze the page you were on.

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but can i send a json object to server in this way?
you can serialize json object then urlencode it , but it is wrong approach and not recommended
no and I didn't notice you want the download to start as a result of a POST... not a great idea I think - no download resume

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