using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] test = { 7, 2, 4, 6, 0, 1, 6, 9, 8 };

​

        var comparer = new Comparer();

        var _ = test.OrderBy(i => i, comparer).First();

    }

}

​

class Comparer : IComparer<int>

{

    public int Compare(int x, int y)

    {

        Console.WriteLine($"Comparing {x} with {y}");

        return x.CompareTo(y);

    }

}

​