HttpWebRequest獲取網頁內容

    /// <summary>
    /// 獲取請求結果
    /// </summary>
    /// <param name="requestUrl">請求地址</param>
    /// <param name="timeout">超時時間(秒)</param>
    /// <param name="requestXML">請求xml內容</param>
    /// <param name="isPost">是否post提交</param>
    /// <param name="encoding">編碼格式 例如:utf-8</param>
    /// <param name="msg">拋出的錯誤信息</param>
    /// <returns>返回請求結果</returns>
    public static string HttpPostWebRequest(string requestUrl, int timeout, string requestXML, bool isPost, string encoding, out string msg)
    {
        msg = string.Empty;
        string result = string.Empty;
        try
        {
            byte[] bytes =Encoding.GetEncoding(encoding).GetBytes(requestXML);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUrl);
            request.ContentType = "application/x-www-form-urlencoded";
            request.Referer = requestUrl;
            request.Method = isPost ? "POST" : "GET";
            request.ContentLength = bytes.Length;
            request.Timeout = timeout * 1000;
            using (Stream requestStream = request.GetRequestStream())
            {
                requestStream.Write(bytes, 0, bytes.Length);
                requestStream.Close();
            }
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream responseStream = response.GetResponseStream();
            if (responseStream != null)
            {
                StreamReader reader = new StreamReader(responseStream, System.Text.Encoding.GetEncoding(encoding));
                result = reader.ReadToEnd();
                reader.Close();
                responseStream.Close();
                request.Abort();
                response.Close();
                return result.Trim();
            }
        }
        catch (Exception ex)
        {
            msg = ex.Message + ex.StackTrace;
        }

        return result;
    }