C# Guid.NewGuid获得随机数

static int GetRandomNumber(int min, int max)
        {
            int rtn = 0;

            Random r = new Random();

            byte[] buffer = Guid.NewGuid().ToByteArray();
            int iSeed = BitConverter.ToInt32(buffer, 0);
            r = new Random(iSeed);

            rtn = r.Next(min, max + 1);

            return rtn;
        }