如何设置Json.Net为默认的序列化的WCF REST服务 [英] How to set Json.Net as the default serializer for WCF REST service

问题描述

是否可以覆盖默认WCF DataContractSerializer的行为时，序列化/反序列化实体，并使用JSON.NET呢？

Is it possible to override the default WCF DataContractSerializer behaviour when Serialize/DeSerialize entities and use JSON.NET instead?

我有以下服务合同用于处理城市实体。对于设计的原因，市实体有IsReference = TRUE，因此默认的DataContractSerializer引发错误。

I have the following service contract for handling the City entity. For design reasons the City entity has IsReference=true, and therefore the default DataContractSerializer raise errors.

有关获取的方法我可以处理JsonConvert.DeserializeObject的情况，但与PUT，POST，DELETE方法的DataContractSerializer花费precedence和失败抱怨的IsReference实体不能被序列化。

For the "GET" methods I can handle the situation with JsonConvert.DeserializeObject, but with "PUT,POST,DELETE" methods DataContractSerializer takes precedence and fails complaining for the IsReference entities cannot be serialized.

我觉得这<一个href="http://www.pluralsight-training.net/community/blogs/aaron/archive/2006/04/21/22284.aspx">Post实施IOperationBehavior，并提供自己的序列化，但我不知道该怎么Json.NET与此相集成。我认为应该有更简单的方法来此。

I have find this Post to implement IOperationBehavior and provide my own Serializer but I do not know how to integrate Json.NET with this. and I believe there should be more straight forward approach for this.

我想AP preciate任何帮助或指导有关这种情况下，或建议其他办法。

I’d appreciate any help or guidance regarding this scenario, or advice to other approaches.

[ServiceContract]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class CityService
{
    [Description("Get all Cities")]  
    [WebGet(UriTemplate = "")]
    public Message Cities()
    {

    }

    [Description("Allows the details of a single City to be updated.")]
    [WebInvoke(UriTemplate = "{code}", Method = "PUT")]
    public Message UpdateCity(string code, City city)
    {
    }
}

感谢

霍山

推荐答案

的扩展恩codeRS和串行器（见<一的使用href="http://msdn.microsoft.com/en-us/library/ms733092.aspx">http://msdn.microsoft.com/en-us/library/ms733092.aspx)或扩展WCF喜欢使用的 DataContractSerializerOperationBehavior 其他的方法是很有趣的，但为您的特殊问题，有更容易的解决方案的方式。

The usage of Extending Encoders and Serializers (see http://msdn.microsoft.com/en-us/library/ms733092.aspx) or other methods of Extending WCF like usage of DataContractSerializerOperationBehavior is very interesting, but for your special problem there are easier solution ways.

如果您已经使用消息键入返回结果的使用WCF4你可以这样做如下：

If you already use Message type to return the results an use WCF4 you can do something like following:

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);
}

在发生错误（如的HTTPStatus code.Unauthorized 或的HTTPStatus code.Conflict 的），或在其他情况下，当你需要设置一个HTTP状态code（如的HTTPStatus code.Created ），您可以继续使用 WebOperationContext.Current.OutgoingResponse.Status code 。

In case of errors (like HttpStatusCode.Unauthorized or HttpStatusCode.Conflict) or in other situations when you need to set a HTTP status code (like HttpStatusCode.Created) you can continue to use WebOperationContext.Current.OutgoingResponse.StatusCode.

另一种方法，你也可以返回流（见<一href="http://blogs.msdn.com/b/carlosfigueira/archive/2008/04/17/wcf-raw-programming-model-web.aspx">http://blogs.msdn.com/b/carlosfigueira/archive/2008/04/17/wcf-raw-programming-model-web.aspx和<一href="http://msdn.microsoft.com/en-us/library/ms732038.aspx">http://msdn.microsoft.com/en-us/library/ms732038.aspx)而不是消息返回任何数据，而无需通过微软的JSON序列额外的默认处理。如果WCF4，你可以使用 CreateStreamResponse （见<一href="http://msdn.microsoft.com/en-us/library/dd782273.aspx">http://msdn.microsoft.com/en-us/library/dd782273.aspx)而不是 CreateTextResponse 。不要忘了写在流中，如果你会使用这种技术生产的响应后设置流位置为0。

As an alternative you can also return a Stream (see http://blogs.msdn.com/b/carlosfigueira/archive/2008/04/17/wcf-raw-programming-model-web.aspx and http://msdn.microsoft.com/en-us/library/ms732038.aspx) instead of Message to return any data without additional default processing by Microsoft JSON serializer. In case of WCF4 you can use CreateStreamResponse (see http://msdn.microsoft.com/en-us/library/dd782273.aspx) instead of CreateTextResponse. Don't forget to set stream position to 0 after writing in the stream if you will use this technique to produce the response.

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