System.Text.Encoding.UTF8.GetBytes问题！

Question

string str= System.BitConverter.ToString( System.Text.Encoding.UTF8.GetBytes("你好"));str得到的是"E4-BD-A0-E5-A5-BD"请问怎么通过"E4BDA0E5A5BD"字符串反向得出“你好”

Answer 1

            string s = "E4BDA0E5A5BD";
            byte[] bs = new byte[s.Length / 2];
            int j = 0;
            for (int i = 0; i < s.Length; i+=2)
            {
                string str = s.Substring(i, 2);
                bs[j] = (byte)int.Parse(str, System.Globalization.NumberStyles.HexNumber);
                j++;
            }
            s = Encoding.UTF8.GetString(bs);

Answer 2

bs[j] = Convert.ToByte(str, 16);这个也可以，看上去更简单些

Answer 3

用哈希值，system.security.cryptography.HMACSHAI