C# json DeserializeObject inheritance

Question

I have a Parent class and a Child class, the json string is containing properties of Child class but when I do a DeserializeObject I can't get those properties because Child became a Parent.

For example :

class Data {
    public List<Parent> Parents;
}

class Parent {
    public string Foo;
}

class Child : Parent {
    public string Bar;
}

var data = new Data { Parents = new List<Parent> { new Child{Bar = "a"} } };
Console.WriteLine(data.Parents.Count); // <= it prints 1
Console.WriteLine(data.Parents.OfType<Child>().Count()); // <= it prints 1

var dataJson = JsonConvert.SerializeObject(data);
data = JsonConvert.DeserializeObject<Data>(dataJson);

Console.WriteLine(data.Parents.Count); // <= it prints 1
Console.WriteLine(data.Parents.OfType<Child>().Count()); // <= it prints 0 instead of 1

What can I do about that ? Newtonsoft.Json can manage to do what I want ?

I4V · Accepted Answer · 2013-08-21 13:20:56Z

5

Use JsonSerializerSettings' TypeNameHandling

var settings = new JsonSerializerSettings() { TypeNameHandling = TypeNameHandling.All };

var dataJson = JsonConvert.SerializeObject(data, settings);
data = JsonConvert.DeserializeObject<Data>(dataJson, settings);

answered Aug 21, 2013 at 13:20

I4V

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