static void Main(string[] args)

         {

             #region 爬虫测试

             {

                 //此处为将要解析的URL,可设置为参数变量(我这里把URL写死了)

                 string html = HttpHelper.DownloadHtml(@"http://wyxa.googlefilm.com.cn/wenzhang/info_386854_w821759016~i5.html", Encoding.UTF8);

                 HtmlDocument doc = new HtmlDocument();

                 //由于本人要解析的网址,HTMl标签是动态生成的,所以不能将XPath表达式一次性写出,只能先解析出来非动态标签,再一步一步解析动态生成的标签.

                 doc.LoadHtml(html);//加载html(此时要解析的标签是非动态生成的,很好获取)

                 string pageNumberPath = @"//table[2]";

                 HtmlNode pageNumberNode = doc.DocumentNode.SelectSingleNode(pageNumberPath);

                 //拿到以上获取的非动态标签之后,再解析里边的动态生成的标签,所以要再次LoadHtml一下

                 doc.LoadHtml(pageNumberNode.InnerHtml);

                 pageNumberPath = "//div[@id='div_text']";

                 pageNumberNode = doc.DocumentNode.SelectSingleNode(pageNumberPath);

                 //同理,解析动态标签,再次LoadHtml

                 doc.LoadHtml(pageNumberNode.InnerHtml);

                 pageNumberPath = "//img";

                 HtmlNodeCollection pageNumberNodes = doc.DocumentNode.SelectNodes(pageNumberPath);

                 //获取到需要的img标签集合后,遍历,获取src地址

                 foreach (var item in pageNumberNodes)

                 {

                     if (item.Attributes["data-src"] != null)

                     {

                         var imgSrc = item.Attributes["data-src"].Value;

                         //控制台打印src地址

                         Console.WriteLine(imgSrc);

                         //通过解析出来的src地址下载图片

                         DownloadPhotoFromUrl(imgSrc);

                     }

                 }

             }

 }

public static string DownloadHtml(string url,Encoding encoding)

{

　　HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(url);

　　myReq.Timeout = ;

　　HttpWebResponse httpWResp = (HttpWebResponse)myReq.GetResponse();

　　Stream myStream = httpWResp.GetResponseStream();

　　if (myStream != null)

　　{

　　　　StreamReader sr = new StreamReader(myStream, encoding);

　　　　return sr.ReadToEnd();

　　}

　　return "";

}

 　　　　  /// <summary>

         /// 从图片地址下载图片到本地磁盘

         /// </summary>

         /// <param name="Url">图片网址</param>

         /// <returns></returns>

         public static void DownloadPhotoFromUrl(string Url)

         {

             HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(Url);

             HttpWebResponse webresponse = (HttpWebResponse)webrequest.GetResponse();

             if (webresponse.StatusCode == HttpStatusCode.OK)

             {

                 System.Drawing.Image image = System.Drawing.Image.FromStream(webresponse.GetResponseStream());

                 //保存在本地文件夹

                 image.Save(@"D:\\images\"+DateTime.Now.ToString("yyyyMMddHHmmssff")+".jpg");

                 //释放资源

                 image.Dispose();

             }

         }