.Net 拼接字符串的优化

在.net中拼接字符串,一般用+=和StringBuilder的Append方法实现

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            long l1, l2;
            string str = "";
            l1 = DateTime.Now.Ticks;
            for (int i = 0; i < 10000; i++)
            {
                str += "sssss";
            }
            l2 = DateTime.Now.Ticks;
            Console.Write("---------------------------------------------------------\n");
            Console.Write("+=运算\n");
            Console.Write("\n消耗时间(纳秒):" + (l2 - l1));
            //Console.Write(str+"\n");
            StringBuilder sb = new StringBuilder();
            l1 = DateTime.Now.Ticks;
            for (int i = 0; i < 10000; i++)
            {
                sb.Append("sssss");
            }
            l2 = DateTime.Now.Ticks;
            Console.Write("\n---------------------------------------------------------\n");
            Console.Write("StringBuilder运算\n");
            Console.Write("\n消耗时间(纳秒):" + (l2 - l1));
            //Console.Write(sb.ToString());
            Console.ReadKey();
        }
    }
}

一般为了方便,使用+=方法居多.其实+=的效率是很低的.执行结果如下图: