gistfile1.txt

public sealed class CustomRange : IEnumerable<int>,IEnumerator<int>
{
	private int cur;
	private readonly int max;
	public CustomRange(int start, int count)
	{
		cur = start - 1;
		max = start + count;
	}
	
	public IEnumerator<int> GetEnumerator()
	{
		return this;
	}
	
	public bool MoveNext()
	{
		if (cur < max)
		{
			return false;
		}
		cur++;
		return true;
	}
	
	public void Reset()
	{
		throw new NotImplementedException();
	}
	
	object IEnumerator.Current
	{
		get
		{
			return Current;
		}
	}
	
	public int Current
	{
		get
		{
			return cur;
		}
	}
	
	IEnumerator IEnumerable.GetEnumerator()
	{
		return GetEnumerator();
	}
	
	public void Dispose()
	{
		
	}
}



internal static class Program
{

	private static void Main(string[] args)
	{
		var range = new  CustomRange(0, 100000);
		var range2 = Enumerable.Range(0, 100000);
		Bench(
	() =>
	{
		int i = 0;
		while (i != 100000)
		{
			var y = i;
			i++;
		}
	}, 10);
				Bench(
			() =>
			{
				foreach (var item in range2)
				{
					var y = item;
				}
			}, 10);
		Bench(
			() =>
			{
				foreach (var item in range)
				{
					var y = item;
				}
			}, 10);




	}
	private static Stopwatch sw = new Stopwatch();
	private static TimeSpan Bench(Action act, int iter)
	{
		
		for (int i = 0; i < 3; i++)
		{
			act();
		}
		GC.Collect();
		Action b =
			() =>
			{
				for (int i = 0; i < iter; i++)
				{
					act();
				}
			};
		b();
		var thread = new Thread(new ThreadStart(b));
		sw.Restart();
		thread.Start();
		thread.Join();
		sw.Stop();
		Console.WriteLine(sw.Elapsed);
		return sw.Elapsed;
	}
}