What am I missing here? It seems from all that I read and watched, exposing JSON from a WCF Data Service should be as easy as adding the '[JSONPSupportBehavior]' directive in front of the Service Class. Problem is VS2010 doesn't recognize 'JSONPSupportBehavior'. Is there a reference I am missing? Seemed like, from alll the articles, it was supportted outta the box.
TIA
S.
WCF Data Services supports JSON out of the box, no need to add attributes or anything. In order to receive a response in JSON format clients use standard HTTP content type negotiation. Specifically, they need to include "application/json" in the "accept" header of the request. There are examples in this section of the OData protocol documentation: http://www.odata.org/developers/protocols/operations#RetrievingfeedsEntriesandservicedocument
(those examples show the raw HTTP requests. different client HTTP APIs have different mechanisms to specify request headers)
The [JSONPSupportBehavior] attribute is an example of an extension that allows clients to use a URL query string option ($format=json) in addition to content-type negotiation, and also adds support for "JSONP" ($callback=[function-name]). These are useful in situations where you don't control the headers, such as when doing cross-domain access through script tags.
If you want to use the JSONPSupportBehavior you can obtain it here: http://code.msdn.microsoft.com/DataServicesJSONP