C# 实现Get/Post请求

        /// <summary>
        /// Get请求
        /// </summary>
        /// <param name="url">请求url</param>
        /// <returns></returns>
        public static string Get(string url)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            if (req == null || req.GetResponse() == null)
                return string.Empty;

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            if (resp == null)
                return string.Empty;

            using (Stream stream = resp.GetResponseStream())
            {
                //获取内容
                using (StreamReader reader = new StreamReader(stream))
                {
                    return reader.ReadToEnd();
                }
            }
        }

        /// <summary>
        /// Post请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <returns></returns>
        private static string Post(string url, object postData)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            if (req == null)
                return string.Empty;

            req.Method = "POST";
            req.ContentType = "application/json";
            req.Timeout = 15000;

            byte[] data = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(postData));
            //注意：无需手动指定长度 (否则可能会报流未处理完就关闭的异常，因为ContentLength时候会比真实post数据长度大)
            //req.ContentLength = data.Length; 
            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
            }

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            if (resp == null)
                return string.Empty;

            using (Stream stream = resp.GetResponseStream())
            {
                using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                {
                    return reader.ReadToEnd();
                }
            }
        }