How to serialize class type but not the namespace to a Json string using DataContractJsonSerializer

Question

I\'m trying to serialize a class hierarchy to a Json string using DataContractJsonSerializer, in a WCF service. the default behaviour for serializing a derived clas

Answer 1

Some times ago i decided this problem. I use DataContractJsonSerializer You will have __type in json, if your method for serialization have Base class parameter, but you give it subClass as parameter. More details:

[DataContract]
[KnownType(typeof(B))]
public abstract class A
{
    [DataMember]
    public String S { get; set; }
}

[DataContract]
public class B : A
{
    [DataMember]
    public Int32 Age { get; set; }
}

public static String ToJson(this T value)
{
    var serializer = new DataContractJsonSerializer(typeof(T));
    using (var stream = new MemoryStream())
    {
        serializer.WriteObject(stream, value);
        return Encoding.UTF8.GetString(stream.ToArray());
    }
}

You have two methods for test:

public static void ReadTypeDerived(A type)
{
    Console.WriteLine(ToJson(type));
}

and

public static void ReadType(T type)
{
    Console.WriteLine(ToJson(type));
}

In first test you wiil have

"{\"__type\":\"B:#ConsoleApplication1\",\"S\":\"Vv\",\"Age\":10}"

In second:

"{\"S\":\"Vv\",\"Age\":10}"