HTTP Error 415 - WCF Load on Demand

[Eyal]

Hi,
I have a RadTreeView in which I want to load the child nodes on demand (as it says in the Demo) using a WCF service I published to my Sharepoint Site.
The service works fine when I initialize the tree on runtime (I get the root's children when the page loads) however, when I open a node I get "The server method 'GetChildNodes' failed", using Fiddler I checked the source of the error and saw this:

"HTTP/1.1 415 Cannot process the message because the content type 'application/json; charset=utf-8' was not the expected type 'text/xml charset=utf-8'."

What am I doing wrong here?

Thanks!

[Helen]

Hi Eyal,

Probably you will find helpful some of the following links:

http://meronymy.blogspot.com/2011/05/fixing-wcf-json-applicationjson-not.html
http://social.msdn.microsoft.com/forums/en-US/wcf/thread/ca11b6f5-dc86-49c4-9ade-e4ea3b5f7d4d
http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/2a64a217-6b75-41df-bf05-98e077635047/

Greetings,
Helen
the Telerik team

[Eyal]

Hi Helen,
First of all thanks for your reply,
After using the attribute WebInvoke telling the OperationContact to expect JSON I was able to get data To and Back from my WCF service(!!), The problem now is that I get a JS exception regarding the JSON that was sent back:

"Sys.Net.WebServiceFaildException: The server method 'GetChildNodes' returned invalid data. The 'd' property is missing from the JSON wrapper."

Using fiddler again I compared the response I get from my own WCF service and the one in the demo and I can see that the 'd' property is indeed missing (*Duh*), How than can I wrap my response JSON with the 'd' property?

Thanks!

[Helen]

Hello Eyal,

Take a look at the following forum post:
http://forums.asp.net/t/1492772.aspx/1
See the last reply.

Regards,
Helen
the Telerik team

[Eyal]

Hi again Helen.

I've read the posts and understand that perhaps I need to Serialize the JSON myself, However in that case the implementation of the Service will not be as it is in your Demo. i.e. the server method will return a string and not RadTreeNodeData[].
Is this even recommended? Am I the only one who encountered this issue?

Thanks again for helping me out!

Eyal

[Helen]

Hello Eyal,

Please review the following kb article:
http://www.telerik.com/community/forums/aspnet-ajax/treeview/wcf-support-for-treeview-load-on-demand.aspx

Regards,
Helen
the Telerik team