c# winfrom 下载网页源代码

第一种：

/// <summary>
/// 下载网页源代码
/// </summary>
/// <param name="Url">网页路径</param>
/// <returns></returns>
private string DownloadCode(string Url)
{
try
{
WebClient webClient = new WebClient();
Byte[] pageData = webClient.DownloadData(Url);
return Encoding.GetEncoding("utf-8").GetString(pageData);
}
catch (Exception ec)
{
throw new Exception(ec.Message.ToString());
}

第二种：

        /// <summary>
        /// 请求地址，返回html代码
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="timeOut">设置请求的超时时间，1000=1秒</param>
        /// <returns></returns>
        public static string HttpGet(string url,int timeOut)
        {
            try
            {
                ServicePointManager.SecurityProtocol = (SecurityProtocolType)192 | (SecurityProtocolType)768 | (SecurityProtocolType)3072;
                string html;
                HttpWebRequest Web_Request = (HttpWebRequest)WebRequest.Create(url);

                Web_Request.AllowAutoRedirect = false;
                //设置请求超时时间
                Web_Request.Timeout = timeOut;
                //请求方式GET,POST
                Web_Request.Method = "GET";
                //请求的身份
                Web_Request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36";
                //添加请求头信息
                Web_Request.Headers.Add("Accept-Encoding", "gzip, deflate");
                Web_Request.ContentType = "application/x-www-form-urlencoded";
                //Web_Request.Credentials = CredentialCache.DefaultCredentials;

                //设置代理属性WebProxy-------------------------------------------------
                //WebProxy proxy = new WebProxy("111.13.7.120", 80);
                //在发起HTTP请求前将proxy赋值给HttpWebRequest的Proxy属性
                //Web_Request.Proxy = proxy;

                HttpWebResponse Web_Response = (HttpWebResponse)Web_Request.GetResponse();

                if (Web_Response.ContentEncoding.ToLower() == "gzip")  // 如果使用了GZip则先解压
                {
                    using (Stream Stream_Receive = Web_Response.GetResponseStream())
                    {
                        using (var Zip_Stream = new GZipStream(Stream_Receive, CompressionMode.Decompress))
                        {
                            using (StreamReader Stream_Reader = new StreamReader(Zip_Stream, Encoding.Default))
                            {
                                html = Stream_Reader.ReadToEnd();
                            }
                        }
                    }
                }
                else
                {
                    using (Stream Stream_Receive = Web_Response.GetResponseStream())
                    {
                        using (StreamReader Stream_Reader = new StreamReader(Stream_Receive, Encoding.Default))
                        {
                            html = Stream_Reader.ReadToEnd();
                        }
                    }
                }

                return html;
            }
            catch (Exception)
            {
                return "error";
            }

        }