System.Net.CookieContainer.GetCookies C# (CSharp) Method

        public CookieCollection GetCookies(Uri uri) {
            if (uri == null) {
                throw new ArgumentNullException("uri");
            }
            return InternalGetCookies(uri);
        }

        /// <summary>
        /// 使用Get方法获取字符串结果（加入Cookie）
        /// </summary>
        /// <param name="url"></param>
        /// <param name="cookieContainer"></param>
        /// <param name="encoding"></param>
        /// <returns></returns>
        public static string HttpGet(string url, CookieContainer cookieContainer = null, Encoding encoding = null, int timeOut = App.AppRequestTimeOut)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Timeout = timeOut;

            if (cookieContainer != null)
            {
                request.CookieContainer = cookieContainer;
            }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            if (cookieContainer != null)
            {
                response.Cookies = cookieContainer.GetCookies(response.ResponseUri);
            }

            using (Stream responseStream = response.GetResponseStream())
            {
                using (StreamReader myStreamReader = new StreamReader(responseStream, encoding ?? Encoding.GetEncoding("utf-8")))
                {
                    string retString = myStreamReader.ReadToEnd();
                    return retString;
                }
            }
        }