private void TestInptr()

        {

            unsafe

            {

                byte a = 100;

                byte* p = &a;

                p = &a;

                Console.WriteLine("修改前a=" + *p);

                a = 200;//修改后再输出

                Console.WriteLine("修改后a=" + *p);

                (*p)++;//通过指针修改a

                Console.WriteLine("Value:" + *p);

            }

        }

修改前a=100

修改后a=200

Value:201

        private unsafe void TestInptr2(byte[] bufferB)

        {

            Stopwatch sw = new Stopwatch();

            sw.Start();

            fixed (byte* p = bufferB)//指向托管变量的指针需要放在fixed里面，bufferB存放在堆中

            {

                for (int i = 0; i < bufferB.Length; i++)

                {

                    *(p + i) = 200;

                }

            }

            sw.Stop();

            Console.WriteLine(sw.ElapsedMilliseconds);

        }