无聊做了如题的一个算法的优劣性能比较，由于很多人都只关心结果，那么我先贴出结果如下：

由于我的测试数据量比较小，只能得出Array.Copy()和Buffer.BlockCopy()方法性能要好于Contact()，这个不用比较也能想到，如果想知道前两个谁的性能更好，

有兴趣的可以修改源码中的测试数据量就可以了。

测试源码如下：

static int len1 = 1470;        static int len2 = 906;        static byte[] bytes0 = new byte[len1];        static byte[] bytes1 = new byte[len2];        static void Main(string[] args)        {            // Uses the second Core or Processor for the Test            Process.GetCurrentProcess().ProcessorAffinity = new IntPtr(1);            Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.High;            // Prevents "Normal" Threads             Thread.CurrentThread.Priority = ThreadPriority.Highest;            Stopwatch sw = new Stopwatch();            byte[] resultBytes = null;            InitBytes();            //test            sw.Reset();            sw.Start();            while (sw.ElapsedMilliseconds < 1200)  // A Warmup of 1000-1500 mS                                                    // stabilizes the CPU cache and pipeline.            {                resultBytes = Contact(bytes0, bytes1);       // Warmup            }            sw.Stop();            for (int i = 0; i < 10; i++)            {                sw.Reset();                sw.Start();                resultBytes = Contact(bytes0, bytes1);                sw.Stop();                Console.WriteLine("Contact Ticks: {0} Time: {1} ms", sw.ElapsedTicks, sw.ElapsedMilliseconds);            }            sw.Reset();            sw.Start();            while (sw.ElapsedMilliseconds < 1200)  // A Warmup of 1000-1500 mS                                                    // stabilizes the CPU cache and pipeline.            {                resultBytes = BufferCopy(bytes0, bytes1);       // Warmup            }            sw.Stop();            for (int i = 0; i < 10; i++)            {                sw.Reset();                sw.Start();                resultBytes = BufferCopy(bytes0, bytes1);                sw.Stop();                Console.WriteLine("BufferCopy Ticks: {0} Time: {1} ms", sw.ElapsedTicks, sw.ElapsedMilliseconds);            }            sw.Reset();            sw.Start();            while (sw.ElapsedMilliseconds < 1200)  // A Warmup of 1000-1500 mS                                                    // stabilizes the CPU cache and pipeline.            {                resultBytes = ArrayCopy(bytes0, bytes1);       // Warmup            }            sw.Stop();            for (int i = 0; i < 10; i++)            {                sw.Reset();                sw.Start();                resultBytes = ArrayCopy(bytes0, bytes1);                sw.Stop();                Console.WriteLine("ArrayCopy Ticks: {0} Time: {1} ms ", sw.ElapsedTicks, sw.ElapsedMilliseconds);            }            Console.ReadKey();        }        static void InitBytes()        {            for(int i=0;i