使用自定义绑定时，WCF REST服务未传递POST请求主体流

Question

Following up from the solution to the previous question I asked here . It seems I now have a problem where if I use a custom binding in my .NET4 web service, then my methods that implement the web service WebInvoke contracts are no longer getting called when they contain the argument of the request body Stream.

So here's code that runs the webservice as found from the the link above:

webserviceHost = new WebServiceHost(typeof(Service1), new Uri("http://localhost:8080));
webserviceHost.AddServiceEndpoint(typeof(IService), getBinding(), "webservice").Behaviors.Add(new WebHttpBehavior());
webserviceHost.Description.Behaviors.Add(new ServiceMetadataBehavior { HttpGetEnabled = true });
webserviceHost.Open();

Here's the WebInvoke service contract defined:

[WebInvoke(UriTemplate = "import_data?param={value}", Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
WebResult importOrder(string value, Stream httpRequestPostBody);

And here's the method implementing the above contract:

public WebResult importOrder(String value, Stream httpRequestPostBody)
{
    doSomething(value, httpRequestPostBody);
}

So if I try making a HTTP request through Fiddler to the webservice endpoint contract it will return a connection reset HTTP error response. If I remove the Stream httpRequestPostBody argument then it will run the method, but I have no way to get access to the raw JSON data in the request body (I can get the body but its in an XML form). So I can only gather that I'm missing something in my custom binding to ensure that the body stream of the request can be passed. Anybody got any clues?

Answer 1

So the only answer I've been able to come up with is to remove the stream from the contract and then use .NET's DataContractJsonSerializer to convert the HTTP request body message from XML back to JSON. As shown below

Contract:

[WebInvoke(UriTemplate = "import_data?param={value}", Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
WebResult importOrder(string value);

Implementation:

public WebResult importOrder(String value){
    MyObject myObject = (MyObject)new DataContractJsonSerializer(typeof(MyObject)).ReadObject(OperationContext.Current.RequestContext.RequestMessage.GetReaderAtBodyContents());

    doSomething(value, myObject);
}

This solution is not ideal since the message is being converted from RAW to JSON to XML to MyObject, and additionally does not allow me to easily use a better 3rd party JSON parser and control how my objects are being initialised from the incoming data. If anyone has got a better solution I'm all ears.