WhereFirst vs First vs foreach

LinqVSForeach.cs

using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics; 
using System.Threading; 

namespace ConsoleApplication
{
	class Program{
		private const int internalIterations = 1000;
		private const int externalIterations = 100;
		private const int dataSize = 1000;//100000;
		private const int search = dataSize - 1;

		private static readonly long[] resultsFirst = new long[externalIterations*2];
		private static readonly long[] resultsWhereFirst = new long[externalIterations*2];
		private static readonly long[] resultsForeach = new long[externalIterations*2];
		private static readonly int[] data = Enumerable.Range(0, dataSize).ToArray();

		static void Main(string[] args)
		{
			Stopwatch sw = new Stopwatch();
			for (int i = 0; i < externalIterations; i++)
			{
				Console.WriteLine("Iteration {0} of {1}", i+1, externalIterations);
				sw.Restart();
				First();
				sw.Stop();
				resultsFirst[i*2] = sw.ElapsedTicks;
				Console.WriteLine("     First : {0}", sw.ElapsedTicks);

				sw.Restart();
				WhereFirst();
				sw.Stop();
				resultsWhereFirst[i*2] = sw.ElapsedTicks;
				Console.WriteLine("WhereFirst : {0}", sw.ElapsedTicks);

				sw.Restart();
				Foreach();
				sw.Stop();
				resultsForeach[i*2] = sw.ElapsedTicks;
				Console.WriteLine("   Foreach : {0}", sw.ElapsedTicks);

				sw.Restart();
				Foreach();
				sw.Stop();
				resultsForeach[i*2+1] = sw.ElapsedTicks;
				Console.WriteLine("   Foreach : {0}", sw.ElapsedTicks);

				sw.Restart();
				WhereFirst();
				sw.Stop();
				resultsWhereFirst[(i*2)+1] = sw.ElapsedTicks;
				Console.WriteLine("WhereFirst : {0}", sw.ElapsedTicks);

				sw.Restart();
				First();
				sw.Stop();
				resultsFirst[(i*2)+1] = sw.ElapsedTicks;
				Console.WriteLine("     First : {0}", sw.ElapsedTicks);
			}

			Console.WriteLine("Done!");
			Console.WriteLine("Averages:");
			Console.WriteLine("     First Average: {0:0.00}", resultsFirst.Average());
			Console.WriteLine("WhereFirst Average: {0:0.00}", resultsWhereFirst.Average());
			Console.WriteLine("   Foreach Average: {0:0.00}", resultsForeach.Average());

		}
		private static void WhereFirst()
		{
			for (int i = 0; i < internalIterations; i++)
			{
				int item = data.Where(d => d == search).First();
			}
		}
		private static void First()
		{
			for (int i = 0; i < internalIterations; i++)
			{
				int item = data.First(d => d == search);
			}
		}
		private static void Foreach()
		{
			for (int i = 0; i < internalIterations; i++)
				foreach (var d in data )
				{
					int item = d;
					// ver 2
					if(item == (internalIterations -1 ))
						break;
				}
		}
	}

}

foreachの中で何もしてなかったのがコンパイル時に削除される可能性を指摘頂いたのでif文を追加したv2をup.