How to tell DataContractJsonSerializer not to include the __type property

Question

I need to add KnownType to the code below to serialize it. When I do this, the generated JSON looks like this:

JSON form of Adult with 1 child: {"age":42,"name":"John","children":[{"__type":" Child:#TestJson","age":4,"name":"Jane","fingers":10}]} 

How do I include __type in it: "Child: #TestJson"? We return hundreds of these elements for some queries and add additional text.

Full code:

 using System; using System.Collections.Generic; using System.IO; using System.Runtime.Serialization; using System.Runtime.Serialization.Json; namespace TestJson { class Program { static void Main(string[] args) { Adult parent = new Adult {name = "John", age = 42}; MemoryStream stream1 = new MemoryStream(); DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Adult)); ser.WriteObject(stream1, parent); stream1.Position = 0; StreamReader sr = new StreamReader(stream1); Console.Write("JSON form of Adult with no children: "); Console.WriteLine(sr.ReadToEnd()); Child child = new Child { name = "Jane", age = 4, fingers=10 }; stream1 = new MemoryStream(); ser = new DataContractJsonSerializer(typeof(Child)); ser.WriteObject(stream1, child); stream1.Position = 0; sr = new StreamReader(stream1); Console.Write("JSON form of Child with no parent: "); Console.WriteLine(sr.ReadToEnd()); // now connect the two parent.children.Add(child); stream1 = new MemoryStream(); ser = new DataContractJsonSerializer(typeof(Adult)); ser.WriteObject(stream1, parent); stream1.Position = 0; sr = new StreamReader(stream1); Console.Write("JSON form of Adult with 1 child: "); Console.WriteLine(sr.ReadToEnd()); } } [DataContract] [KnownType(typeof(Adult))] [KnownType(typeof(Child))] class Person { [DataMember] internal string name; [DataMember] internal int age; } [DataContract] class Adult : Person { [DataMember] internal List<Person> children = new List<Person>(); } [DataContract] class Child : Person { [DataMember] internal int fingers; } } 

Answer 1

As I said in the last question, I don’t know, but some studies make me think that the following can achieve what you want:

 var settings = new DataContractJsonSerializerSettings(); settings.EmitTypeInformation = EmitTypeInformation.Never; var serializer = new DataContractJsonSerializer(yourType, settings);