using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        IEnumerable<Test> list = new List<Test>()

        {

            new Test { A = "A1", B = "B1"},

            new Test { A = "A2", B = "B2"}

        };

        var jsonContent = System.Text.Json.JsonSerializer.Serialize(list);

        Console.WriteLine($"1. JSON: {jsonContent}");

​

        var list1a = System.Text.Json.JsonSerializer.Deserialize<IEnumerable<Test>>(jsonContent);

​

        Console.WriteLine($"1. Count: {list1a!.ToList().Count}, Name: {list1a.GetType().FullName}");

​

​

        ICollection<Test> list2 = new List<Test>()

        {

            new Test { A = "A1", B = "B1"},

            new Test { A = "A2", B = "B2"}

        };

        var jsonContent2 = System.Text.Json.JsonSerializer.Serialize(list2);

        Console.WriteLine($"2. JSON: {jsonContent2}");

​

        var list2a = System.Text.Json.JsonSerializer.Deserialize<ICollection<Test>>(jsonContent2);

​

        Console.WriteLine($"2. Count: {list2a!.ToList().Count}, Name: {list2a.GetType().FullName}");

    }

​

};

​

    public class Test

    {

        public string A { get; init; }

        public string B { get; init; }

    }