wIndows phone 7 解析Html数据

wIndows phone 7 解析Html数据

 

在我的上一篇文章中我介绍了windows phone 7的gb2312解码,

http://www.2cto.com/kf/201111/112551.html

解决了下载的Html乱码问题,这一篇,我将介绍关于windows phone 7解析html数据，以便我们获得想要的数据.

 

这里,我先介绍一个类库HtmlAgilityPack,（上一篇文章也是通过这个工具来解码的）. 类库的dll文件我会随demo一起提供

 

这里,我以新浪新闻为例来解析数据

 

 

 

先看看网页版的新浪新闻

 

http://news.sina.com.cn/w/sd/2011-11-27/070023531646.shtml

 

然后我们看一下他的源文件，

 

发现新闻内容的结构是

 

view sourceprint?<div class="blkContainerSblk"> 

 

                <h1 id="artibodyTitle" pid="1" tid="1" did="23531646" fid="1666">title</h1> 

 

                <div class="artInfo"><span id="art_source"><a href="http://www.sina.com.cn">http://www.sina.com.cn</a></span>  <span id="pub_date">pub_date</span>  <span id="media_name"><a href="">media_name</a> <a href=""></a> </span></div> 

 

  

 

                <!-- 正文内容begin --> 

 

                <!-- google_ad_section_start --> 

 

  

 

                <div class="blkContainerSblkCon" id="artibody"></div> 

 

</div>

 

大部分还有ID属性,这更适合我们去解析了。

 

接下来我们开始去解析

 

第一： 引用HtmlAgilityPack.dll文件

 

第二：用WebClient或者WebRequest类来下载HTML页面然后处理成字符串。

 

view sourceprint?public  delegate void CallbackEvent(object sender, DownloadEventArgs e); 

 

       public  event CallbackEvent DownloadCallbackEvent; 

 

       public void HttpWebRequestDownloadGet(string url) 

 

       { 

 

             

 

           Thread _thread = new Thread(delegate() 

 

           { 

 

               Uri _uri = new Uri(url, UriKind.RelativeOrAbsolute); 

 

               HttpWebRequest _httpWebRequest = (HttpWebRequest)WebRequest.Create(_uri); 

 

                _httpWebRequest.Method="Get"; 

 

               

 

               _httpWebRequest.BeginGetResponse(new AsyncCallback(delegate(IAsyncResult result) 

 

               { 

 

                   HttpWebRequest _httpWebRequestCallback = (HttpWebRequest)result.AsyncState; 

 

                   HttpWebResponse _httpWebResponseCallback = (HttpWebResponse)_httpWebRequestCallback.EndGetResponse(result); 

 

                   Stream _streamCallback = _httpWebResponseCallback.GetResponseStream(); 

 

 

 

                   StreamReader _streamReader = new StreamReader(_streamCallback,new HtmlAgilityPack.Gb2312Encoding()); 

 

                   string _stringCallback = _streamReader.ReadToEnd(); 

 

                  

 

                   Deployment.Current.Dispatcher.BeginInvoke(new Action(() => 

 

                   { 

 

                       if (DownloadCallbackEvent != null) 

 

                       { 

 

                           DownloadEventArgs _downloadEventArgs = new DownloadEventArgs(); 

 

                           _downloadEventArgs._DownloadStream = _streamCallback; 

 

                           _downloadEventArgs._DownloadString = _stringCallback; 

 

                           DownloadCallbackEvent(this, _downloadEventArgs); 

 

 

 

                       } 

 

                   })); 

 

 

 

               }), _httpWebRequest); 

 

           }) ; 

 

           _thread.Start(); 

 

       } 

 

      // }

 

O(∩_∩)O! 我这个比较复杂, 总之我们下载了html的数据就行了。 

 

贴一个简单的下载方式吧

 

view sourceprint?WebClient webClenet=new WebClient();   

 

  

 

         webClenet.Encoding = new HtmlAgilityPack.Gb2312Encoding(); //加入这句设定编码   

 

  

 

         webClenet.DownloadStringAsync(new Uri("http://news.sina.com.cn/s/2011-11-25/120923524756.shtml", UriKind.RelativeOrAbsolute));        

 

  

 

         webClenet.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClenet_DownloadStringCompleted);

 

 现在处理回调函数的e.Result

 

view sourceprint?string _result = e._DownloadString; 

 

 

 

           HtmlDocument _doc = new HtmlDocument(); //实例化HtmlAgilityPack.HtmlDocument对象 

 

           _doc.LoadHtml(_result);         //载入HTML 

 

 

 

           HtmlNode _htmlNode01 = _doc.GetElementbyId("artibodyTitle");  //新闻标题的Div 

 

           string _title = _htmlNode01.InnerText; 

 

 

 

           HtmlNode _htmlNode02 = _doc.GetElementbyId("artibody");     //获取内容的div   

 

           string _content = _htmlNode02.InnerText; 

 

          // int _count= _htmlNode02.ChildNodes.Where(new Func<HtmlNode,bool>("div")); 

 

           int _divIndex = _content.IndexOf(" .blkComment"); 

 

 

 

           _content= _content.Substring(0,_divIndex); 

 

 

 

           #region　新浪标签 

 

           HtmlNode _htmlNodo03 = _doc.GetElementbyId("art_source"); 

 

           string _www = _htmlNodo03.FirstChild.InnerText; 

 

           string _wwwInt = _htmlNodo03.FirstChild.Attributes[0].Value; 

 

           #endregion 

 

           // string _source = _htmlNodo03; 

 

           //_htmlNodo03.ChildNodes 

 

 

 

           #region 发布时间 

 

           HtmlNode _htmlNodo04 = _doc.GetElementbyId("pub_date"); 

 

           string _pub_date = _htmlNodo04.InnerText; 

 

           #endregion 

 

 

 

 

 

           #region 来源网站信息 

 

           HtmlNode _htmlNodo05 = _doc.GetElementbyId("media_name"); 

 

           string _media_name = _htmlNodo05.FirstChild.InnerText; 

 

           string _modia_source = _htmlNodo05.FirstChild.Attributes[0].Value; 

 

           #endregion 

 

 

 

           Media_nameHyperlinkButton.Content = _pub_date + " " + _media_name; 

 

           Media_nameHyperlinkButton.NavigateUri = new Uri(_modia_source, UriKind.RelativeOrAbsolute); 

 

           TitleTextBlock.Text = _title; 

 

           ContentTextBlock.Text = _content;

 

 

 

结果如下图所示：

 

 

 

网页的大部分标签是没有ID属性的,不过幸运的是HtmlAgilityPack支持XPath

 

那就需要通过XPATH语言来查找匹配所需节点

 

XPath教程：http://www.w3school.com.cn/xpath/index.asp

 

 

 

案例下载：

 

http://115.com/file/dn87dl2d#

MyFramework_Test.zip

 

作者 青瓷