using System;

using System.Diagnostics;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string texto = "Ninguem ninguem, todos";

        Stopwatch stp = new Stopwatch();

​

        stp.Start();

        string resultado = texto.Substring(0, texto.IndexOf(',')); // 0.383s

        stp.Stop();

        Console.WriteLine("IndexOf ElapsedMilliseconds: {0}", stp.ElapsedMilliseconds);

        Console.WriteLine("IndexOf ElapsedTicks: {0}", stp.ElapsedTicks);

        Console.WriteLine("------------------------------");

        stp.Restart();

        resultado = texto.Split(',')[0]; // 1.400s

        stp.Stop();

        Console.WriteLine("Split ElapsedMilliseconds: {0}", stp.ElapsedMilliseconds);

        Console.WriteLine("Split ElapsedTicks: {0}", stp.ElapsedTicks);

        Console.WriteLine("------------------------------");

        stp.Restart();

        resultado = new string(texto.TakeWhile(c => c != ',').ToArray()); //5.204s

        stp.Stop();

        Console.WriteLine("TakeWhile 1 ElapsedMilliseconds: {0}", stp.ElapsedMilliseconds);

        Console.WriteLine("TakeWhile 1 ElapsedTicks: {0}", stp.ElapsedTicks);

        Console.WriteLine("------------------------------");

        stp.Restart();

        resultado = string.Concat(texto.TakeWhile(c => c != ',')); // 6.746s

        stp.Stop();

        Console.WriteLine("TakeWhile 2 ElapsedMilliseconds: {0}", stp.ElapsedMilliseconds);

        Console.WriteLine("TakeWhile 2 ElapsedTicks: {0}", stp.ElapsedTicks);

        Console.WriteLine("------------------------------");

        stp.Restart();

        resultado = Regex.Split(texto, ",")[0]; // 8.595s

        stp.Stop();

        Console.WriteLine("Regex ElapsedMilliseconds: {0}", stp.ElapsedMilliseconds);

        Console.WriteLine("Regex ElapsedTicks: {0}", stp.ElapsedTicks);

        Console.WriteLine("------------------------------");

​

    }

}