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

?

<divclass="blkContainerSblk">

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

                <divclass="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 -->

 

                <divclass="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。

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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

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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

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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