C# 字节数组(byte[])拼接的性能对比测试

将C#中的三种字节数组拼接方式的性能做了一个对比测试，DEMO程序代码如下：

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Byte数组拼接测试
{class Program{static int RunCount = 10000;static void Main(string[] args){ArrayCopyTest();BlockCopyTest();ListTest();Console.ReadKey();}static void ListTest(){List<byte> byteSource = new List<byte>();byteSource.Add(11);Stopwatch sw = new Stopwatch();sw.Start();for (int i = 0; i < RunCount; i++){byte[] newData = new byte[10] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };byteSource.AddRange(newData);}byte[] data = byteSource.ToArray();sw.Stop();Console.WriteLine("ListTest " + sw.ElapsedMilliseconds + " 毫秒,数组长度：" + data.Length);}static void ArrayCopyTest(){byte[] byteSource = new byte[1] { 11 };Stopwatch sw = new Stopwatch();sw.Start();for (int i = 0; i < RunCount; i++){byte[] newData = new byte[10] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };byte[] tmp = new byte[byteSource.Length + newData.Length];Array.Copy(byteSource, tmp, byteSource.Length);Array.Copy(newData, 0, tmp, byteSource.Length, newData.Length);byteSource = tmp;}sw.Stop();Console.WriteLine("ArrayCopyTest " + sw.ElapsedMilliseconds + " 毫秒,数组长度：" + byteSource.Length);}static void BlockCopyTest(){byte[] byteSource = new byte[1] { 11 };Stopwatch sw = new Stopwatch();sw.Start();for (int i = 0; i < RunCount; i++){byte[] newData = new byte[10] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };byte[] tmp = new byte[byteSource.Length + newData.Length];System.Buffer.BlockCopy(byteSource, 0, tmp, 0, byteSource.Length);System.Buffer.BlockCopy(newData, 0, tmp, byteSource.Length, newData.Length);byteSource = tmp;}sw.Stop();Console.WriteLine("BlockCopyTest " + sw.ElapsedMilliseconds + " 毫秒,数组长度：" + byteSource.Length);}}}

测试结果：