How to use JSON web services from Windows client
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Yes, it does as long as the client-side service interface definition is configured correctly (ie, the RequestFormat / ResponseFormat properties of the WebGet / WebInvoke attribute for the operation contracts are set to Json. Also remember that you will need to use the WebHttp or WebScriptEnabled behaviors on your client.
Note that JSon is not necessarily the most efficient given the current WCF implementation; there are certain trade-offs that you will make. There's a good overview of it on in this article .
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