using System;

using System.Text.Json;

using System.Text.Json.Serialization;

​

// Instantiate derived classes

Foo foo = new Foo { FooValue = 123 };

Bar bar = new Bar { BarValue = "Hello, Bar!" };

​

// Serialize the objects

string fooJson = JsonSerializer.Serialize<Base>(foo);

string barJson = JsonSerializer.Serialize<Base>(bar);

​

Console.WriteLine($"Serialized Foo: {fooJson}");

Console.WriteLine($"Serialized Bar: {barJson}");

​

Console.WriteLine();

​

// Deserialize the objects

Base deserializedFoo = JsonSerializer.Deserialize<Base>(fooJson);

Base deserializedBar = JsonSerializer.Deserialize<Base>(barJson);

​

Console.WriteLine($"Deserialized Foo: {deserializedFoo.GetType().Name}");

Console.WriteLine($"Deserialized Bar: {deserializedBar.GetType().Name}");

​

[JsonDerivedType(typeof(Foo), "Foo")]

[JsonDerivedType(typeof(Bar), "Bar")]

public abstract class Base;

public abstract class Base1 : Base;

​

public class Foo : Base1

{

    public int FooValue { get; set; }

}

​

public class Bar : Base1

{

    public string BarValue { get; set; }

}