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.cnblogs.com/qingci/archive/2011/11/25/2263124.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

<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。

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

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

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