What if you encounter a problem when consume your WCF service ? How to Diagnostic it ?

The Answer is the Log Tracing the WCF .

My service is:

[OperationContract(Name="Add")]

[WebInvoke(UriTemplate = "test/", Method = "POST",

          ResponseFormat=WebMessageFormat.Json,

          RequestFormat=WebMessageFormat.Json )]

public int Add(Number n1)

{

    res = Convert.ToInt32(n1.Number1) + Convert.ToInt32(n1.Number2);

    return res;

}

　　

Data are..

[Serializable]

    public class Number

    {

        public int Number1 { get; set; }

        public int Number2 { get; set; }

    }

　　

When I call from fiddler its return ‘HTTP/1.1 400 Bad Request’

My fiddler request header is:

User-Agent: Fiddler

Host: localhost:4217

Content-Type: application/json; charset=utf-8

 

And request body is:

{"Number1":"7","Number2":"7"}

 

And response header is:

HTTP/1.1 400 Bad Request

Server: ASP.NET Development Server/10.0.0.0

Date: Sun, 14 Aug 2011 18:10:21 GMT

X-AspNet-Version: 4.0.30319

Content-Length: 5450

Cache-Control: private

Content-Type: text/html

Connection: Close

 

 

The way you'll find out the issue with your code is to enable tracing on the server, and it will have an exception explaining the problem. I wrote a simple test with your code, and it had a similar error (400), and the traces had the following error:

The data contract type 'WcfForums.StackOverflow_7058942+Number' cannot be

deserialized because the required data members '<Number1>k__BackingField,

<Number2>k__BackingField' were not found.

 

See Also

http://msdn.microsoft.com/en-us/library/ms733025.aspx