C# http协议Post方式调用WebService

        /// <summary>
        /// Post方法
        /// </summary>
        /// <param name="url">webService的URL</param>
        /// <param name="method">调用的方法</param>
        /// <param name="reqBodys">参数组合</param>
        /// <returns></returns>
        public static string WebServiceHttpPost(string URL, string Method, List<ReqBody> ReqBodys)
        {
            string param = string.Empty;
            switch (ReqBodys.Count)
            {
                case 0:
                    break;
                case 1:
                    param = HttpUtility.UrlEncode(ReqBodys[0].Key) + "=" + HttpUtility.UrlEncode(ReqBodys[0].Value);
                    break;
                default:
                    param = HttpUtility.UrlEncode(ReqBodys[0].Key) + "=" + HttpUtility.UrlEncode(ReqBodys[0].Value);
                    for (int i = 1; i < ReqBodys.Count; i++)
                    {
                        param += "&" + HttpUtility.UrlEncode(ReqBodys[i].Key) + "=" + HttpUtility.UrlEncode(ReqBodys[i].Value);
                    }
                    break;
            }
            byte[] byteArray = Encoding.UTF8.GetBytes(param);

            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(URL + "/" + Method);
            webRequest.Method = "POST";
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.ContentLength = byteArray.Length;
            webRequest.GetRequestStream().Write(byteArray, 0, byteArray.Length);       //把参数数据写入请求数据的Stream对象

            HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();      //获得响应

            #region 这种方式读取到的是一个返回的结果字符串 
            using(XmlTextReader reader = new XmlTextReader(webResponse.GetResponseStream()))  //获取响应流
            {
                reader.MoveToContent();
                return reader.ReadInnerXml();
            }
            #endregion

            #region 这种方式读取到的是一个Xml格式的字符串
            //using(StreamReader sr = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8));
            //{
            //    return sr.ReadToEnd();
            //}
            #endregion
        }