serializing/deserializing derived objects using JSON.NET without using JsonProperty?

Question

I'm using the NewtonSoft JSON.NET library for serializing the following class where DTOBase can hold derived instances.

public class Command
{         
    public DTOBase CommandDTO  { get; set; }                
}

Per this article you need to include the JsonProperty attribute so that the derived instances get deserialized properly

public class Command
{ 

  [JsonProperty(TypeNameHandling = TypeNameHandling.All)]  
  public DTOBase CommandDTO  { get; set; }       
 }

The question is whether there is any other way besides using an attribute to get the same result? I would prefer to not be coupled to the NewtonSoft library and json serialization in particular at the class level. Is there a way to specify some settings on the Serialize/Deserialize methods of the library at all to get the same result?

Mrchief · Accepted Answer · 2014-01-13 22:09:16Z

4

The TypeNameHandling property can be set on JsonSerializerSettings when you call JsonConvert.SerializeObject(value, settings).

If you only want the name included for derived objects set TypeNameHandling to TypeNameHandling.Auto.

edited Jan 13, 2014 at 22:09

Mrchief

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answered Jun 7, 2011 at 6:50

James Newton-King

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2 Comments

Abhijeet Patel Over a year ago

Hi James, I tried this but it did not work, the serialized string does not contain the type information for the property like it does when I use the JsonProperty attribute. v var settings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All}; string serializedInstance = JsonConvert.SerializeObject(myobject,Formatting.None,settings);

Abhijeet Patel Over a year ago

Looks like I had an older version of te library. I upgraded to the latest one and the JsonSerializerSettings with TypeNameHandling.Auto works as expected.

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