使用HttpWebRequest POST数据到服务器上

HTTP协议中，向服务器传递参数的几个位置是： HTTP Header / GET的字符串 / POST中间的Body

下面的示例代码演示如何简单的POST数据到服务器.

// 发送请求

string requestBody = string.Format("{0}={1}&{2}={3}&{4}={5}&{6}={7}&{8}={9}"

, HttpUtility.UrlEncode("version_id", Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode(m_VersionNo, Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode("merchant_id", Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode(m_MerchantID, Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode("verifystring", Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode(hashStr.ToString().ToLower(), Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode("order_date", Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode(m_OrderDate, Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode("order_id", Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode(m_OrderID, Encoding.GetEncoding("GB2312"))

, HttpUtility.UrlEncode("retmode", Encoding.GetEncoding("GB2312"))

, string.Empty

);

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(m_GatewayURL);

request.Method = "POST";

request.KeepAlive = false;

request.ContentType = "application/x-www-form-urlencoded";

byte[] aryBuf = Encoding.GetEncoding("GB2312").GetBytes(requestBody);

request.ContentLength = aryBuf.Length;

using(Stream writer = request.GetRequestStream())

string ret = string.Empty;

using (WebResponse response = request.GetResponse())