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public string SendDataByPost(string param, string Url)
       {
           try
           {
               HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
               byte[] bs = Encoding.UTF8.GetBytes(param);
               request.Method = "Post";
               request.ContentType = "application/x-www-form-urlencoded;charset=utf8";
               request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0";
               request.Accept = "application/json, text/javascript, */*; q=0.01";
               request.ContentType = "application/x-www-form-urlencoded";
               request.ContentLength = bs.Length;
               Stream newSteam = request.GetRequestStream();
               newSteam.Write(bs, 0, bs.Length);
               newSteam.Close();
               HttpWebResponse response = (HttpWebResponse)request.GetResponse();
               Stream myResponseStream = response.GetResponseStream();
               StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
               string retString = myStreamReader.ReadToEnd();
               myStreamReader.Close();
               myResponseStream.Close();
 
               return retString;
           }
           catch (Exception ex)
           {
               return ex.ToString();
           }
 
       }

　　

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        public string MD5(string str)
        {
            //微软md5方法参考return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "md5");
            byte[] b = Encoding.UTF8.GetBytes(str);
            b = new MD5CryptoServiceProvider().ComputeHash(b);
            string ret = "";
            for (int i = 0; i < b.Length; i++)
                ret += b[i].ToString("x").PadLeft(2, '0');
            return ret;
        }
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