闲得发慌篇_字符串直接赋值与替换性能对比

using System;
using System.Diagnostics;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            var str1 = "转到编辑界面";
            var num = 0;
            while (num < 5)
            {
                test1(str1);
                test2(str1);
                num += 1;  
　　　　　　　　  System.Console.WriteLine("=====================");
            }
        }

        private static void test1(string str1)
        {
            var num = 0; var str = str1;
            var sw = new Stopwatch();
            sw.Start();
            while (num < 100000)
            {
                if (str == str1)
                    str = str.Replace("编辑", "预览");
                else
                    str = str.Replace("预览", "编辑");
                num += 1;
            }
            sw.Stop();
            System.Console.WriteLine(sw.ElapsedMilliseconds);
        }

        private static void test2(string str1)
        {
            var num = 0; var str = "";
            var sw = new Stopwatch();
            sw.Start();
            while (num < 100000)
            {
                str = str == str1 ? "转到预览界面" : "转到编辑界面";
                num += 1;
            }
            sw.Stop();
            System.Console.WriteLine(sw.ElapsedMilliseconds);
        }
    }
}