数组复制性能测试
1 using System; 2 using System.Collections; 3 using System.Collections.Generic; 4 using System.Data; 5 using System.Diagnostics; 6 using System.IO; 7 using System.Linq; 8 using System.Runtime.InteropServices; 9 using System.Threading; 10 using EmisData; 11 using Newtonsoft.Json; 12 13 namespace CLibrary.ConsoleApp 14 { 15 class Program 16 { 17 static void Main(string[] args) 18 { 19 int len = 50000000; 20 int[] newArray = new int[len]; 21 Stopwatch sw = new Stopwatch(); 22 int[] allArray = new int[len]; 23 for (int i = 0; i < len; i++) 24 { 25 allArray[i] = i; 26 } 27 28 sw.Start(); 29 Thread.Sleep(1000); 30 Array.Copy(allArray, newArray, len); 31 sw.Stop(); 32 Console.WriteLine("Array.Copy 执行时间（毫秒）"+ sw.ElapsedMilliseconds); 33 34 Array.Clear(newArray, 0, len); 35 sw.Restart(); 36 Thread.Sleep(1000); 37 newArray = (int[])allArray.Clone(); 38 sw.Stop(); 39 Console.WriteLine("Array.Clone 执行时间（毫秒）" + sw.ElapsedMilliseconds); 40 41 Array.Clear(newArray, 0, len); 42 sw.Restart(); 43 Thread.Sleep(1000); 44 Buffer.BlockCopy(allArray, 0, newArray, 0, len); 45 sw.Stop(); 46 Console.WriteLine("Buffer.BlockCopy 执行时间（毫秒）" + sw.ElapsedMilliseconds); 47 48 Console.ReadKey(); 49 } 50 51 52 53 } 54 55 }
测试结果：
可见：Buffer.BlockCopy 表现最佳
