How to pass data to JsonResult in ASP.NET MVC?

Question

this must be a newbie question.

I have this method in a controller:

public JsonResult GetUpdates(string lastChatMessage)
{
   var json = Json(new {lastModeratorAction = -1});
   return json;
}

I am calling it with $.ajax or $.getJSON from Javascript. The method gets called but there is an exception somewhere. If I use $.ajax I define an "error" callback and it tells me that the status of the XmlHttpRequest is "error". The error message is "undefined".

If I return "null" from the above method it works fine. Probably there is an exception during JSON serialization. Any hints?

tvanfosson · Accepted Answer · 2010-06-19 19:24:52Z

3

If you are using a GET to send the request, you need to indicate that it's acceptable to return a JsonResult.

 return Json( new { lastModeratorAction = -1 }, JsonRequestBehavior.AllowGet );

answered Jun 19, 2010 at 19:24

tvanfosson

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2 Comments

Sparhawk Over a year ago

Wow, thanks a lot! I've seen many examples but none featured the AllowGet thing. Now it works like a charm.

tvanfosson Over a year ago

@sparhawk - this was added in MVC2 due to the possibility for hijacking a json response to a GET request by overriding the object prototype's __defineSetter__ method. See Phil Haack's article: haacked.com/archive/2009/06/25/json-hijacking.aspx

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