using System;

using System.Globalization;

using System.Threading;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var json = @"{""Test"": [ 1, 2, 3 ]}";

        var foo = JsonConvert.DeserializeObject<Foo>(json);

        Console.WriteLine(foo.Test.First());

    }

}

​

public class Foo

{

    public ICollection<int> Test = new List<int>();

​

    public Foo(ICollection<int> test)

    {

        Test = test;

    }

}