c# - How to use HTMLAgilityPack to extract HTML data -


i learning write web crawler , found great examples me started since new this, have few questions in regards coding method.

the search result example can found here: search result

when @ html source result can see following:

<hr><center><h3>license information *</h3></center><hr>                                                                        <p>                                                                                                                                   <center> 06/03/2014 </center> <br>                                                                                      <b>name : </b> williams ajaya l                     <br>                                                                       <b>address : </b> new york            ny                                          <br>                                         <b>profession : </b> athletic trainer                          <br>                                                            <b>license no: </b> 001475 <br>                                                                                                <b>date of licensure : </b> 01/12/07      <br>                                                                                                                                                                                                                 <b>additional qualification : </b>     &nbsp; not applicable in profession                       <br>                     <b> <a href="http://www.op.nysed.gov/help.htm#status"> status :</a></b> registered                                        <br> <b>registered through last day of : </b> 08/15      <br>

how can use htmlagilitypack scrap data site?

i trying implement example shown below, not sure make edit working crawl page:

private void btncrawl_click(object sender, eventargs e)         {             foreach (shdocvw.internetexplorer ie in shellwindows)             {                 filename = path.getfilenamewithoutextension( ie.fullname ).tolower();                  if ( filename.equals( "iexplore" ) )                 txturl.text = "now crawling: " + ie.locationurl.tostring();             }             string url = ie.locationurl.tostring();             string xmlns = "{http://www.w3.org/1999/xhtml}";             crawler cl = new crawler(url);             xdocument xdoc = cl.getxdocument();             var res = item in xdoc.descendants(xmlns + "div")                       item.attribute("class") != null && item.attribute("class").value == "folder-news"                       && item.element(xmlns + "a") != null                       //select item;                       select new                       {                           link = item.element(xmlns + "a").attribute("href").value,                           image = item.element(xmlns + "a").element(xmlns + "img").attribute("src").value,                           title = item.elements(xmlns + "p").elementat(0).element(xmlns + "a").value,                           desc = item.elements(xmlns + "p").elementat(1).value                       };             foreach (var node in res)             {                 messagebox.show(node.tostring());                 tb.text = node + "\n";             }             //console.readkey();                            }

the crawler helper class:

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.xml.linq;  namespace crawlerweb {     public class crawler     {          public string url         {             get;             set;         }         public crawler() { }         public crawler(string url)         {             this.url = url;         }         public xdocument getxdocument()         {             htmlagilitypack.htmlweb doc1 = new htmlagilitypack.htmlweb();             doc1.useragent = "mozilla/4.0 (conpatible; msie 7.0; windows nt 5.1)";             htmlagilitypack.htmldocument doc2 = doc1.load(url);             doc2.optionoutputasxml = true;             doc2.optionautocloseonend = true;             doc2.optiondefaultstreamencoding = system.text.encoding.utf8;             xdocument xdoc = xdocument.parse(doc2.documentnode.selectsinglenode("html").outerhtml);             return xdoc;         }     } }

tb multiline textbox... display following:

name williams ajaya l

address new york ny

profession athletic trainer

license no 001475

date of licensure 1/12/07

additional qualification not applicable in profession

status registered

registered through last day of 08/15

i second argument added array because next step write sql database...

i able url ie has search result how can code in script?

this little snippet should started:

htmldocument doc = new htmldocument(); webclient client = new webclient(); string html = client.downloadstring("http://www.nysed.gov/coms/op001/opsc2a?profcd=67&plicno=001475&namechk=wil"); doc.loadhtml(html);  htmlnodecollection nodes = doc.documentnode.selectnodes("//div");

you use webclient class download html file , load html htmldocument object. need use xpath query dom tree , search nodes. in above example "nodes" include div elements in document.

here's quick reference xpath syntax: http://msdn.microsoft.com/en-us/library/ms256086(v=vs.110).aspx


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