byte转为string 乱码
byte[] result1 = Encoding.Default.GetBytes(username + city + time);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] output1 = md5.ComputeHash(result1);
byte[] result2 = Encoding.Default.GetBytes(output1.ToString() + key);
byte[] output2 = md5.ComputeHash(result2);
byte[] result3 = Encoding.Default.GetBytes(output2.ToString() + ip);
byte[] output3 = md5.ComputeHash(result3);
string rule1 = Encoding.Default.GetString(output3);
得到的rule1是乱码,我就是MD5加密,然后得到加密后的字符串