C#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