MD5加密算法

 #region MD5加密
        ///<summary>
        ///给一个字符串进行MD5加密
        ///</summary>
        ///<param name="strText">待加密字符串</param>
        ///<returns>加密后的字符串</returns>
        public static string MD5Encrypt(string strText)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] result = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strText));//用到UTF8
            md5.Clear();
            string ret = "";
            for (int i = 0; i < result.Length; i++)
            {
                ret += Convert.ToString(result[i], 16).PadLeft(2, '0');//这一步非常关键
            }
            return ret.PadLeft(32, '0').ToUpper();
        }
        #endregion