Can someone show an example of an HTTP Handler that returns JSON and supports cross domain calls. I am using jQuery's getJSON() that sends a request to an .ashx file on my web server.

I understand that I need to add ?callback=? to my url in the getJSON() url, but I'm not sure what needs to be done on the server in my ashx file?

解決方案

Figured it out. I added this function to my handler and called it:

void WriteCallback(HttpContext context, string json)

{

context.Response.Write(string.Format("{0}({1});", context.Request["callback"], json));

}

Then in the browser:

$(function () {

$.getJSON('MyHandler.ashx?callback=?', { Foo: "Bar" }, function (data) {

if (data.SomeCondition)

$('#someElement').show();

});

});

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