C# MD5 加密

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/// <summary>       /// 32位MD5加密       /// </summary>       /// <param name="str"></param>       /// <returns></returns>       public static string MD5(string str)       {           try           {               var md5Csp = new MD5CryptoServiceProvider();               byte[] md5Source = Encoding.UTF8.GetBytes(str);               byte[] md5Out = md5Csp.ComputeHash(md5Source);               string pwd = "";               for (int i = 0; i < md5Out.Length; i++)               {                   pwd += md5Out[i].ToString("x2");               }               return pwd;           }           catch (Exception ex)           {               WriteLog.WriteErrorInfo(ex);           }           return "";       }