C # Array.Copy () método Buffer.BlockCopy () Eficiencia Comparación

categorías de prueba:

public class CopySpeedTest
{
	//3M空间
    private byte[] Bytes = new byte[3 * 1024 * 1024];
    private int Len { get; set; }

    public CopySpeedTest()
    {
        //使用一个图片文件的流
        using (var fs = new FileStream(@"D:\temp\pic.jpg", FileMode.Open)) 
        {
           Len = fs.Read(Bytes, 0, (int)fs.Length);
        }
    }

    public void ArrayCopy()
    {
        byte[] arr = new byte[Len + 100];
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
        //循环50000次
        for (int i = 0; i < 50000; i++)
        {
        	//复制，设置偏移为30
            Array.Copy(Bytes, 0, arr, 30, Len);
        }
        stopwatch.Stop();
        Console.WriteLine($"ArryCopy:{stopwatch.ElapsedMilliseconds}");
    }

    public void BlockBuffer()
    {
        byte[] arr = new byte[Len + 100];
        Stopwatch stopwatch = new Stopwatch();
        //循环50000次
        stopwatch.Start();
        for (int i = 0; i < 50000; i++)
        {
       		//复制，设置偏移为30
            Buffer.BlockCopy(Bytes, 0, arr, 30, Len);
        }
        stopwatch.Stop();
        Console.WriteLine($"BlockBuffer:{stopwatch.ElapsedMilliseconds}");
    }
}

El programa principal:

static void Main(string[] args)
{
    int cnt = 1;
    while (true)
    {
        Console.WriteLine($"+++++++++++第{cnt++}次+++++++++++");
        CopySpeedTest test = new CopySpeedTest();
        List<Task> tasks = new List<Task>();

		//并行计算
        tasks.Add(Task.Run(() => { test.BlockBuffer(); }));
        tasks.Add(Task.Run(() => { test.ArrayCopy(); }));
        Task.WaitAll(tasks.ToArray());
        
        Console.WriteLine();
        Console.ReadKey();
    }
}   

Los resultados son como sigue,仅供参考