using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace StringFormatEfficiency{    class Program    {        static void Main(string[] args)        {            string format = "my {0} is {1}";            string name = "name";            string zhangyaolin = "zhangyaolin";            string my = "my ";            string iss = " is ";            DateTime  start = new DateTime();            DateTime end = new DateTime();            string aa = null;                       int maxcount = 10e6;            for (int ii = 0; ii < 10; ii++)            {                start = DateTime.Now;                for (int i = 0; i < maxcount; i++)                {                    aa = string.Format(format, name, iss);                }                end = DateTime.Now;                TimeSpan ts1 = end - start;                Console.WriteLine(ts1.Milliseconds.ToString());                //-------------------------                start = DateTime.Now;                for (int i = 0; i < maxcount; i++)                {                    aa = string.Concat(my, name, iss, zhangyaolin);                }                end = DateTime.Now;                TimeSpan ts2 = end - start;                Console.WriteLine(ts2.Milliseconds.ToString());                //--------------------------                start = DateTime.Now;                for (int i = 0; i < maxcount; i++)                {                    aa = my + name + iss + zhangyaolin;                }                end = DateTime.Now;                TimeSpan ts3 = end - start;                Console.WriteLine(ts3.Milliseconds.ToString());                Console.WriteLine("time1(format) : time2(connect) : time3(operator) =  {0} : {1} : 1", (1.0 * ts1.Milliseconds / ts3.Milliseconds).ToString(“F3”), (1.0 * ts2.Milliseconds / ts3.Milliseconds).ToString(“F3”));                Console.WriteLine();            }        }    }}