Returning JSON from a JsonResult method in MVC controller

Question

I am trying to populate a ComboBox (Telerik RAD COmboBox) in a test ASP.NET MVC3 app.

I have defined the ComboBox on my ASPX page and in the controller I have define

Answer 1

If the resultset string is already JSON (and not wrapped in any XML), then you'd want to return a ContentResult with exactly that string as the content:

public ContentResult GetCALMdata()
{
    CALMwsP.wsCALMSoapClient wsC = new CALMwsP.wsCALMSoapClient("wsCALMSoap");
    string resultset = wsC.GetRefTables("P_1", "P_2", "P_3", "P_4");

    return Content(resultset, "application/json");
}

You don't want to use JsonResult or the Json() helper in this case, because that's going to end up re-serializing your JSON.

Answer 2

If using ASP.NET MVC 2 or higher:

return Json(resultset, JsonRequestBehavior.AllowGet);

Answer 3

if I correctly understood you should use the Json() method

return Json(resultset);

Answer 4

The individual Json Method:

return Json(resultset);

It needs the System.Web.Http DLL and the namespace is System.Web.Http.Results.

---

Or Website wide put this line in the WebApiConfig.cs

config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));

Answer 5

In MVC 5 and possibly below you can do something like this:

            var dict = new Dictionary<string, string>
            {
                { "name", "Foobar" },
                { "url", "admin@foobar.com" }
            };

            var json = new JsonResult()
            {
                Data = dict
            };