http方式发送和获取数据

/// <summary>
        /// 根据URL获取网页内容(get方法)
        /// </summary>
        /// <param name="Url"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        public static string GetUrltoHtml(string Url, string type)
        {
            try
            {
                System.Net.WebRequest wReq = System.Net.WebRequest.Create(Url);
                // Get the response instance.
                System.Net.WebResponse wResp = wReq.GetResponse();
                System.IO.Stream respStream = wResp.GetResponseStream();
                // Dim reader As StreamReader = New StreamReader(respStream)
                using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, Encoding.GetEncoding(type)))
                {
                    return reader.ReadToEnd();
                }
            }
            catch (System.Exception ex)
            {
                //errorMsg = ex.Message;
            }
            return "";
        }
        ///<summary>
        ///采用https协议访问网络（post方法）
        ///</summary>
        ///<param name="URL">url地址</param>
        ///<param name="strPostdata">发送的数据</param>
        ///<returns></returns>
        public string OpenReadWithHttps(string URL, string strPostdata, string strEncoding)
        {
            Encoding encoding = Encoding.Default;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.Method = "post";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/x-www-form-urlencoded";
            byte[] buffer = encoding.GetBytes(strPostdata);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding(strEncoding)))
            {
                return reader.ReadToEnd();
            }
        }