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    <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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    1. POHow to set Json.Net as the default serializer for WCF REST service
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    1. USOleg
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    1. COOleg, many thanks, it works like a charm by returning Stream type, it stops Microsft serializer. I am aware of DataContractSerializerOperationBehavior, but it takes me to inheret my own Serializer from XmlObjectSerializer which is not an easy task. Your proposal is much simpler and straight forward, Thank you once more.
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      1. USHossam
    2. COHow does that handle deserializing the incoming City object?
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      1. USChristopher Stott
    3. CO@Christopher Stott: See for example http://msdn.microsoft.com/en-us/library/ms734675.aspx starting with "Reading Messages".
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