数组复制性能测试

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using EmisData;
using Newtonsoft.Json;

namespace CLibrary.ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            int len = 50000000;
            int[] newArray = new int[len];
            Stopwatch sw = new Stopwatch();
            int[] allArray = new int[len];
            for (int i = 0; i < len; i++)
            {
                allArray[i] = i;
            }

            sw.Start();
            Thread.Sleep(1000);
            Array.Copy(allArray, newArray, len);
            sw.Stop();
            Console.WriteLine("Array.Copy 执行时间（毫秒）"+ sw.ElapsedMilliseconds);

            Array.Clear(newArray, 0, len);
            sw.Restart();
            Thread.Sleep(1000);
            newArray = (int[])allArray.Clone();
            sw.Stop();
            Console.WriteLine("Array.Clone 执行时间（毫秒）" + sw.ElapsedMilliseconds);

            Array.Clear(newArray, 0, len);
            sw.Restart();
            Thread.Sleep(1000);
            Buffer.BlockCopy(allArray, 0, newArray, 0, len);
            sw.Stop();
            Console.WriteLine("Buffer.BlockCopy 执行时间（毫秒）" + sw.ElapsedMilliseconds);

            Console.ReadKey();
        }

       

    }

}

测试结果：

 可见：Buffer.BlockCopy 表现最佳