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Asked: 2026-05-11T09:57:29+00:00

I’m trying to use jQuery and JSON with a C# Web Service that I

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I’m trying to use jQuery and JSON with a C# Web Service that I wrote. No matter what, the following code will only output in XML.

Webservice Code

[WebMethod] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] public string HelloWorld() {     return 'Hello World!'; }

I also have these attributes assigned to the class

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [ScriptService]

jQuery Code

$.ajax({     type: 'POST',     contentType: 'application/json; charset=utf-8',     url: 'ScheduleComputerDS.asmx/HelloWorld',     data: '{}',     dataType: 'jsonp',     success: function(data) {         alert(data);     } });

The ASMX page always returns as content type ‘text/xml’. Anything I’m missing?

EDITS: In response to a couple answers:

If I have the datatype as just ‘json’ the content is still XML and jQuery also will not call my callback function. If I add the ‘&callback=?’ to the url, IIS throws a HTTP 500 error.

My class does inherit from ‘System.Web.Services.WebService’.

From doing some research on your guys answers, it looks like I do need to mess with WCF. Unfortunately the JSON that is returned is more designed for MS Ajax and is a lot of useless bloat for my use. I may look into an open source library like Jayrock or something similar.

Thanks for all your help!

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1 Answer

  1. As far as I know, the ScriptService attribute just allows the service to automatically create a JavaScript proxy (by appending /js to the endpoint address – ScheduleComputerDS.asmx/js in your case). It does not allow you to call the operations on the service the way you’re trying to do.

    You could instead use a RESTful WCF service (which requires .NET 3.5) which you can access by sending a properly shaped URI via an HTTP GET.

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