C# 后台 POST GET 使用的API

 /// <summary>
        /// 使用Get方法获取字符串结果（没有加入Cookie）
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string HttpGet(string url, Encoding encoding = null)
        {
            WebClient wc = new WebClient();
            wc.Encoding = encoding ?? Encoding.UTF8;
            //if (encoding != null)
            //{
            //    wc.Encoding = encoding;
            //}
            return wc.DownloadString(url);
        }
        
        //body是要传递的参数,格式"roleId=1&uid=2"
        //post的cotentType填写:
        //"application/x-www-form-urlencoded"
        //soap填写:"text/xml; charset=utf-8"
        public static string PostHttp(string url, string body, string contentType)
        {
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);

            httpWebRequest.ContentType = contentType;
            httpWebRequest.Method = "POST";
            httpWebRequest.Timeout = 20000;

            byte[] btBodys = Encoding.UTF8.GetBytes(body);
            httpWebRequest.ContentLength = btBodys.Length;
            httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

            HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
            string responseContent = streamReader.ReadToEnd();

            httpWebResponse.Close();
            streamReader.Close();
            httpWebRequest.Abort();
            httpWebResponse.Close();

            return responseContent;
        }