Error when sending JSON string via ajaxRequest() method

[Rob]

I have the following JavaScript code that creates a really simple JSON object...

var data = {'MyID':1,'MyItem':'This is the first item'};
var JSONdata = JSON.stringify(data);
$find('<%= RadAjaxManager1.ClientID %>').ajaxRequest(JSONdata);

This generates the following JSON string after running the object through the stringify method...

{"MyID":1,"MyItem":"This is the first item"}

This is valid JSON according to JSONLint.com.

Calling the .ajaxRequest() method results in Sys.WebForms.PageRequestManagerServerErrorException - "Specified cast is not valid"

It's not even getting to my RadAjaxManager1_AjaxRequest() event handler where I have a breakpoint set to inspect the value of e.argument.

What's wrong here?

I'm using version 2010.3.1317.35 of the Telerik controls.

Rob  

[Rob]

Using Web Development Helper the callstack for this error is as follows:

at http://localhost:3391/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ContentPlaceHolder1_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d3.5.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a553a4a13-b3a5-4e6b-a152-b131051f1788%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2010.3.1317.35%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3ad7b88a55-4248-43ee-a9ed-d9058fd97467%3a16e4e7cd%3a7165f74%3aed16cbdc [6]
    JScript anonymous function

[Rob]

Further debug information - the error is occurring in code emitted into one of the Telerik.Web.UI.WebResource.axd's...

Error.create Telerik.Web.UI.WebResource.axd:6

Sys.WebForms.PageRequestManager._createPageRequestManagerServerError Telerik.Web.UI.WebResource.axd:15
Sys.WebForms.PageRequestManager._parseDelta Telerik.Web.UI.WebResource.axd:15
Sys.WebForms.PageRequestManager._onFormSubmitCompleted Telerik.Web.UI.WebResource.axd:15
(anonymous function) Telerik.Web.UI.WebResource.axd:6
(anonymous function) Telerik.Web.UI.WebResource.axd:6
Sys.Net.WebRequest.completed Telerik.Web.UI.WebResource.axd:6
_onReadyStateChange

The array of JSON objects that I was sending as the RadAjaxManager's ajaxRequest() argument was originally 34 elements in length. To eliminate the problem being down to the length of the array I restricted it to two items, however the problem still occurs.

Please take a look at this for me - I'm running out of ways to isolate the problem.

Many thanks,
Rob

[Pavlina]

Hi Rob,

Can you download latest version of RadControls for ASP.NET AJAX and verify that the same error still persists?

Kind regards,
Pavlina
the Telerik team