String、StringBuilder类连接字符串操作的时间差异
最新文章:Virson's Blog
刚刚看到园子里面写了一篇关于Java的《StringBuilder、StringBuffer、String类之间的关系》的文章,自己也想试试看C#的String和StringBuilder类之间的差异,于是有了这篇文章:
CSharp代码:
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using System.Diagnostics; 7 8 namespace TestCharactor 9 { 10 class TestChar 11 { 12 private static int times = 50000; //循环次数 13 private static Stopwatch sw = new Stopwatch(); 14 15 static void Main(string[] args) 16 { 17 string tmpS = "adcdefg"; 18 StringBuilder tmpSb = new StringBuilder("abcdefg"); 19 sw.Start(); 20 Test(tmpS); 21 sw.Stop(); 22 Console.WriteLine("使用+操作符连接字符串共花费时间:{0}毫秒", sw.ElapsedMilliseconds); 23 sw.Restart(); 24 Test(tmpSb); 25 sw.Stop(); 26 Console.WriteLine("使用StringBuilder类连接字符串共花费时间:{0}毫秒", sw.ElapsedMilliseconds); 27 Console.ReadKey(); 28 } 29 30 public TestChar() 31 { 32 33 } 34 35 public static void Test(String s) 36 { 37 //sw.Start(); 38 for (int i = 0; i < times; ++i ) 39 { 40 s += "Virson Ma"; 41 } 42 //sw.Stop(); 43 //Console.WriteLine("使用+操作符连接字符串共花费时间:{0}毫秒", sw.ElapsedMilliseconds); 44 } 45 46 public static void Test(StringBuilder sb) 47 { 48 //sw.Restart(); 49 for (int i = 0; i < times; ++i ) 50 { 51 sb.Append("Virson Ma"); 52 } 53 //sw.Stop(); 54 //Console.WriteLine("使用StringBuilder类连接字符串共花费时间:{0}毫秒", sw.ElapsedMilliseconds); 55 } 56 } 57 }
测试结果可以看出使用StringBuilder的Append方法比String的“+”操作要节省很多时间!
Result: