Parse Html data in wIndows phone 7

In my previous article, I introduced gb2312 Decoding for windows phone 7,

Http://www.cnblogs.com/qingci/archive/2011/11/25/2263124.html

This article describes how to parse Html data in windows phone 7 to obtain the desired data.

Here, I will first introduce a class library HtmlAgilityPack (this tool was used to decode in the previous article). The dll file of the class library will be provided along with the demo

Here, I use Sina news as an example to parse data

 

Let's take a look at Sina news on the webpage

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

Then let's take a look at his source file,

The structure of news content is found to be

The result looks like this:

Most tags on web pages have no ID attribute, but fortunately HtmlAgilityPack supports XPath

Then you need to find the matching node through XPATH language

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

Zh

Case download:

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

Most also have the ID attribute, which is more suitable for us to parse.

Next we start to parse

First: Reference the HtmlAgilityPack.dll file

Second: Use the WebClient or WebRequest class to download the HTML page and process it into a string.

 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! I am more complicated. In short, we just download the html data.

Post a simple download method

WebClient webClenet = new WebClient ();

          webClenet.Encoding = new HtmlAgilityPack.Gb2312Encoding (); // Add this sentence to set the encoding

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

          webClenet.DownloadStringCompleted + = new DownloadStringCompletedEventHandler (webClenet_DownloadStringCompleted);

Now handle e.Result of callback function

string _result = e._DownloadString;

            HtmlDocument _doc = new HtmlDocument (); // Instantiate HtmlAgilityPack.HtmlDocument object
            _doc.LoadHtml (_result); // Load HTML

            HtmlNode _htmlNode01 = _doc.GetElementbyId ("artibodyTitle"); // Div for news title
            string _title = _htmlNode01.InnerText;

            HtmlNode _htmlNode02 = _doc.GetElementbyId ("artibody"); // Get content 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 Sina tags
            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 release time
            HtmlNode _htmlNodo04 = _doc.GetElementbyId ("pub_date");
            string _pub_date = _htmlNodo04.InnerText;
            #endregion


            #region Source site information
            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;

The result looks like this:

Most tags on web pages have no ID attribute, but fortunately HtmlAgilityPack supports XPath

Then you need to find the matching node through XPATH language

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

 

Case download:

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