Deserialize json based on fields in .Net (C#)

Question

I\'m writing an app that gets a Json list of objects like this:

[
   {
       \"ObjectType\": \"apple\",
       \"ObjectSize\": 35,
       \"ObjectC         


        

Answer 1

You can use a CustomCreationConverter. This lets you hook into the deserialization process.

public abstract class Base
{
    public string Type { get; set; }
}

class Foo : Base
{
    public string FooProperty { get; set; }
}

class Bar : Base
{
    public string BarProperty { get; set; }
}

class CustomSerializableConverter : CustomCreationConverter
{
    public override Base Create(Type objectType)
    {
        throw new NotImplementedException();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        var jObject = JObject.Load(reader);

        var type = (string)jObject.Property("Type");
        Base target;
        switch (type)
        {
            case "Foo":
                target = new Foo();
                break;
            case "Bar":
                target = new Bar();
                break;
            default:
                throw new InvalidOperationException();
        }
        serializer.Populate(jObject.CreateReader(), target);
        return target;
    }
}

class Program
{
    static void Main(string[] args)
    {
        var json = "[{Type:\"Foo\",FooProperty:\"A\"},{Type:\"Bar\",BarProperty:\"B\"}]";
        List bases = JsonConvert.DeserializeObject>(json, new CustomSerializableConverter());
    }
}