Challenges with Serialization of Polymorphic Objects in JSON.NET - Missing Subtype Properties
This might be a silly question, but I'm encountering issues when trying to serialize a polymorphic collection of objects using JSON.NET in C#. Specifically, I have a base class `Animal` and two derived classes `Dog` and `Cat`. When I serialize a list of `Animal` objects, the properties of the derived classes seem to be omitted from the serialized output. Here's a simplified version of my classes: ```csharp public class Animal { public string Name { get; set; } } public class Dog : Animal { public bool IsBarking { get; set; } } public class Cat : Animal { public bool IsPurring { get; set; } } ``` When I attempt to serialize a list like this: ```csharp var animals = new List<Animal> { new Dog { Name = "Rex", IsBarking = true }, new Cat { Name = "Whiskers", IsPurring = true } }; var json = JsonConvert.SerializeObject(animals); ``` The resulting JSON output only includes the `Name` property: ```json [ { "Name": "Rex" }, { "Name": "Whiskers" } ] ``` I've tried using the `TypeNameHandling` setting to include type information during serialization: ```csharp var settings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All }; var json = JsonConvert.SerializeObject(animals, settings); ``` But I still only get the base class properties in the serialized JSON. I also verified that the derived class properties are indeed set before serialization. Could this be an issue with how I'm defining or registering the types? Any suggestions on how to resolve this? I'm using JSON.NET version 12.0.3. I'm coming from a different tech stack and learning C#. Thanks for any help you can provide!