在C#中做MD5加密

我看到了两种方法

public string DoEncrypt(string strContent)
        {
            byte[] bytes = Encoding.Unicode.GetBytes(strContent.ToCharArray());
            byte[] buffer2 = new MD5CryptoServiceProvider().ComputeHash(bytes);
            StringBuilder builder = new StringBuilder(buffer2.Length);
            foreach (byte num in buffer2)
            {
                builder.Append(Convert.ToString(num, 0x10));
            }
            return builder.ToString().ToUpper();
        }

或

public static string getMD5(string str, int code)
    {

        if (code == 16) //16位加密
        {
            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);
        }

        else if (code == 32) //32位加密
        {
            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
        }
        return "0";
    }

总之，就是一个字符串进来，转成字节数组，加密后变成另一个字节数组，再还原成一个字符串