Rank, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public static class Program
    {
        public static void Main(string[] args)
        {
            string[] myNames = new string[]
            { "Bob", "Mark", "John", "Jim", "Lisa", "Dave" };

var query = myNames.Rank(s => s.Length, (s, r) => new { s, r });

foreach (var x in query)
            {
              Console.WriteLine("{0} {1}", x.r, x.s);
            }
        }
    
        public static IEnumerable<U> Rank<T, TKey, U>
        (
          this IEnumerable<T> source,
          Func<T, TKey> keySelector,
          Func<T, int, U> selector
        )
        {
            if (!source.Any())
            {
                yield break;
            }

int itemCount = 0;
            T[] ordered = source.OrderBy(keySelector).ToArray();
            TKey previous = keySelector(ordered[0]);
            int rank = 1;
            foreach (T t in ordered)
            {
                itemCount += 1;
                TKey current = keySelector(t);
                if (!current.Equals(previous))
                {
                    rank = itemCount;
                }
                yield return selector(t, rank);
                previous = current;
            }
        }    
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,12 sec, cpu time: 0,14 sec, average memory usage: 15 Mb, average nr of threads: 3, absolute service time: 0,34 sec