using System;

using Microsoft.FSharp.Collections;

​

public class Program

{

    public static void Main()

    {

        var key1 = new[]{"Bar", "Foo"};

        var key2 = new[]{"Bar", "Foo", "Zack"};

        var key3 = new[]{"Car", "Foo"};

​

        var fSharpMap =

            MapModule.Empty<string[], int>()

                .Add(key1, 0)

                .Add(key2, 1)

                .Add(key3, 2);

​

        Console.WriteLine($"{fSharpMap[key1]}");

        Console.WriteLine($"{fSharpMap[key2]}");

        Console.WriteLine($"{fSharpMap[key3]}");

        // Not the same objects as key1 / key2 / key3 - keys use structural comparison

        var key4 = new[]{"Bar", "Foo"};

        var key5 = new[]{"Bar", "Foo", "Zack"};

        var key6 = new[]{"Car", "Foo"};

​

        Console.WriteLine($"{fSharpMap[key4]}");

        Console.WriteLine($"{fSharpMap[key5]}");

        Console.WriteLine($"{fSharpMap[key6]}");

    }

}

​