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copied!<p>The usage of Extending Encoders and Serializers (see <a href="http://msdn.microsoft.com/en-us/library/ms733092.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/ms733092.aspx</a>) or other methods of Extending WCF like usage of <code>DataContractSerializerOperationBehavior</code> is very interesting, but for your special problem there are easier solution ways.</p> <p>If you already use <code>Message</code> type to return the results an use WCF4 you can do something like following:</p> <pre><code>public Message UpdateCity(string code, City city) { MyResponseDataClass message = CreateMyResponse(); // use JSON.NET to serialize the response data string myResponseBody = JsonConvert.Serialize(message); return WebOperationContext.Current.CreateTextResponse (myResponseBody, "application/json; charset=utf-8", Encoding.UTF8); } </code></pre> <p>In case of errors (like <code>HttpStatusCode.Unauthorized</code> or <code>HttpStatusCode.Conflict</code>) or in other situations when you need to set a HTTP status code (like <code>HttpStatusCode.Created</code>) you can continue to use <code>WebOperationContext.Current.OutgoingResponse.StatusCode</code>.</p> <p>As an alternative you can also return a <code>Stream</code> (see <a href="http://blogs.msdn.com/b/carlosfigueira/archive/2008/04/17/wcf-raw-programming-model-web.aspx" rel="noreferrer">http://blogs.msdn.com/b/carlosfigueira/archive/2008/04/17/wcf-raw-programming-model-web.aspx</a> and <a href="http://msdn.microsoft.com/en-us/library/ms732038.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/ms732038.aspx</a>) instead of <code>Message</code> to return any data without additional default processing by Microsoft JSON serializer. In case of WCF4 you can use <code>CreateStreamResponse</code> (see <a href="http://msdn.microsoft.com/en-us/library/dd782273.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/dd782273.aspx</a>) instead of <code>CreateTextResponse</code>. Don't forget to set stream position to 0 after writing in the stream if you will use this technique to produce the response.</p>

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