C#post方法

post方法

/// <summary>
        /// post请求方法
        /// </summary>
        /// <param name="url"></param>
        /// <param name="str"></param>
        /// <returns></returns>
        private static string Post(string url, string str)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";

            byte[] data = Encoding.UTF8.GetBytes(str);  // 把字符串转换为字节

            req.ContentLength = data.Length;  // 请求长度

            using (Stream reqStream = req.GetRequestStream())  // 获取
            {
                reqStream.Write(data, 0, data.Length);  // 向当前流中写入字节
                reqStream.Close();                      // 关闭当前流
            }

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); //响应结果
            Stream stream = resp.GetResponseStream();
            // 获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }
    }