using System;

using System.Text.Json;

​

public class Program

{

    public static void Main()

    {

        var otherClass = new OtherClass{Id = 6, Name = "Test"};

        Console.WriteLine("Without generics:");

        WriteWithoutGenerics(otherClass);

        Console.WriteLine("With generics:");

        WriteWithGenerics(otherClass);

    }

​

    public static void WriteWithoutGenerics(BaseClass item)

    {

        var jsonString = JsonSerializer.Serialize(item);

        Console.WriteLine(jsonString);

    }

​

    public static void WriteWithGenerics<T>(T item)

        where T : BaseClass

    {

        var jsonString = JsonSerializer.Serialize(item);

        Console.WriteLine(jsonString);

    }

}

​

public class BaseClass

{

    public int Id

    {

        get;

        set;

    }

}

​

public class OtherClass : BaseClass

{

    public string Name

    {

        get;

        set;

    }

}