MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer

It appears this has been fixed in MVC4.

You can do this, which worked well for me:

public ActionResult SomeControllerAction()
{
  var jsonResult = Json(veryLargeCollection, JsonRequestBehavior.AllowGet);
  jsonResult.MaxJsonLength = int.MaxValue;
  return jsonResult;
}

No need for a custom class. This is all that is needed:

return new JsonResult { Data = Result, MaxJsonLength = Int32.MaxValue };

where Result is that data you wish to serialize.

Unfortunately the web.config setting is ignored by the default JsonResult implementation. So I guess you will need to implement a custom json result to overcome this issue.

You could also use ContentResult as suggested here instead of subclassing JsonResult.

var serializer = new JavaScriptSerializer { MaxJsonLength = Int32.MaxValue, RecursionLimit = 100 };

return new ContentResult()
{
    Content = serializer.Serialize(data),
    ContentType = "application/json",
};