How to use HTML Agility pack

Question

How do I use the HTML Agility Pack   My XHTML document is not completely valid  That s why I wanted to use it  How do I use it in my project  My project is in C

User · Answer

I don t know if this will be of any help to you  but I have written a couple of articles which introduce the basics    HtmlAgilityPack Article Series Introduction To The HtmlAgilityPack Library  Easily extracting links from a snippet of html with HtmlAgilityPack   The next article is 95  complete  I just have to write up explanations of the last few parts of the code I have written  If you are interested then I will try to remember to post here when I publish it

User · Answer

First  install the HTMLAgilityPack nuget package into your project   Then  as an example   HtmlAgilityPack HtmlDocument htmlDoc   new HtmlAgilityPack HtmlDocument        There are various options  set as needed htmlDoc OptionFixNestedTags true      filePath is a path to a file containing the html htmlDoc Load filePath       Use   htmlDoc LoadHtml xmlString    to load from a string  was htmlDoc LoadXML xmlString      ParseErrors is an ArrayList containing any errors from the Load statement if  htmlDoc ParseErrors    null  amp  amp  htmlDoc ParseErrors Count    gt  0           Handle any parse errors as required    else        if  htmlDoc DocumentNode    null                HtmlAgilityPack HtmlNode bodyNode   htmlDoc DocumentNode SelectSingleNode    body             if  bodyNode    null                           Do something with bodyNode                      NB   This code is an example only and not necessarily the best only approach   Do not use it blindly in your own application    The HtmlDocument Load   method also accepts a stream which is very useful in integrating with other stream oriented classes in the  NET framework   While HtmlEntity DeEntitize   is another useful method for processing html entities correctly    thanks Matthew   HtmlDocument and HtmlNode  are the classes you ll use most   Similar to an XML parser  it provides the selectSingleNode and selectNodes methods that accept XPath expressions   Pay attention to the HtmlDocument Option        boolean properties   These control how the Load and LoadXML methods will process your HTML XHTML   There is also a compiled help file called HtmlAgilityPack chm that has a complete reference for each of the objects   This is normally in the base folder of the solution

User · Answer

Main HTMLAgilityPack related code is as follows  using System  using System Net  using System Web  using System Web Services  using System Web Script Services  using System Text RegularExpressions  using HtmlAgilityPack   namespace GetMetaData            lt summary gt          Summary description for MetaDataWebService          lt  summary gt       WebService Namespace    http   tempuri org          WebServiceBinding ConformsTo   WsiProfiles BasicProfile1 1        System ComponentModel ToolboxItem false          To allow this Web Service to be called from script  using ASP NET AJAX  uncomment the following line       System Web Script Services ScriptService      public class MetaDataWebService  System Web Services WebService                WebMethod           ScriptMethod UseHttpGet   false           public MetaData GetMetaData string url                        MetaData objMetaData   new MetaData                   Get Title             WebClient client   new WebClient                string sourceUrl   client DownloadString url                objMetaData PageTitle   Regex Match sourceUrl                   lt title b   gt     gt  s    lt Title gt   s S      lt  title  gt    RegexOptions IgnoreCase  Groups  Title   Value                 Method to get Meta Tags             objMetaData MetaDescription   GetMetaDescription url               return objMetaData                     private string GetMetaDescription string url                        string description   string Empty                 Get Meta Tags             var webGet   new HtmlWeb                var document   webGet Load url               var metaTags   document DocumentNode SelectNodes    meta                 if  metaTags    null                                foreach var tag in metaTags                                        if  tag Attributes  name      null  amp  amp  tag Attributes  content      null  amp  amp  tag Attributes  name   Value ToLower       description                                                 description   tag Attributes  content   Value                                                                     else                               description   string Empty                            return description

User · Answer

Getting Started - HTML Agility Pack     From File var doc   new HtmlDocument    doc Load filePath       From String var doc   new HtmlDocument    doc LoadHtml html       From Web var url    http   html-agility-pack net    var web   new HtmlWeb    var doc   web Load url

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public string HtmlAgi string url  string key                 var Webget   new HtmlWeb            var doc   Webget Load url           HtmlNode ourNode   doc DocumentNode SelectSingleNode string Format    meta  name   0      key             if  ourNode    null                              return ourNode GetAttributeValue  content                           else                       return  not fount

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HtmlAgilityPack uses XPath syntax  and though many argues that it is poorly documented  I had no trouble using it with help from this XPath documentation  https   www w3schools com xml xpath syntax asp  To parse   lt h2 gt     lt a href    gt Jack lt  a gt   lt  h2 gt   lt ul gt     lt li class  tel  gt       lt a href    gt 81 75 53 60 lt  a gt     lt  li gt   lt  ul gt   lt h2 gt     lt a href    gt Roy lt  a gt   lt  h2 gt   lt ul gt     lt li class  tel  gt       lt a href    gt 44 52 16 87 lt  a gt     lt  li gt   lt  ul gt    I did this   string url    http   website com   var Webget   new HtmlWeb    var doc   Webget Load url   foreach  HtmlNode node in doc DocumentNode SelectNodes    h2  a        names Add node ChildNodes 0  InnerHtml     foreach  HtmlNode node in doc DocumentNode SelectNodes    li  class  tel    a        phones Add node ChildNodes 0  InnerHtml

User · Answer

try this  string htmlBody   ParseHmlBody dtViewDetails Rows 0   Body   ToString      private string ParseHmlBody string html                        string body   string Empty              try                               var htmlDoc   new HtmlDocument                    htmlDoc LoadHtml html                   var htmlBody   htmlDoc DocumentNode SelectSingleNode    body                    body   htmlBody OuterHtml                            catch  Exception ex                                 dalPendingOrders LogMessage  Error in ParseHmlBody    ex Message                             return body

[c#] How to use HTML Agility pack

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