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, 30 Mar 2004
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A non-well-formed HTML parser for .NET


This library produces a domain tree of a given HTML document, allowing the developer to navigate and change the document in an methodical way. In addition to the basic HTML production, this library can also be used to produce XHTML documents, as it includes an HTML 4 entity encoder. Included in this release is a demonstration application in VB.NET showing how to use the library. I hope that it is all fairly self-explanatory.


This library was written to avoid having to convert a document into XML prior to reading, whilst preserving the distinct HTML qualities. This gets round some deployment issues I had with different platforms.

Using the code

The simplest way to use the code is to add it into your solution as a C# class library. There are no third-party dependencies so it is just a matter of adding the source files in. Alternatively, you can build the DLL and add it as a reference.

Points of Interest

The XHTML production is fairly basic - there is no built-in DTD checking. So far, I have had no problems in the generation, but I'm keen on getting that sorted.


  • 1.4
  • 1.3
    • Bugfix: <!DOCTYPE...> and <!...> now treated as comments
    • Bugfix: Malformed or incomplete attribute values causing infinite loop fixed
  • 1.2
    • Bugfix: <tag/> now handled properly
    • Bugfix: Parse errors of scripts
    • Bugfix: Parse errors of styles
    • HTML 4 entity encoding
    • DOM tree navigation
    • Basic node searching
    • HTML production
    • XHTML production (as per
    • Added some component model stuff & comments
    • Hid the parser
  • 1.1
    • Initial release


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About the Author

Member 987427

United Kingdom United Kingdom
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Comments and Discussions

QuestionWhitespace between text and anchor PinmemberMike11424-Oct-12 15:59 
BugBug fix for pages with different encoding PinmemberMember 846475913-Dec-11 6:40 
BugBug fix in returning multi empty spaces between words PinmemberMember 846475912-Dec-11 5:31 
BugError : Input string was not in a correct format. PinmemberMember 846475912-Dec-11 1:51 
Questionthank you PinmemberMember 84647596-Dec-11 7:09 
GeneralMy vote of 5 Pinmemberjp73125-Nov-10 1:45 
NewsWorks very good for Google! Pinmemberjp73125-Nov-10 1:45 
GeneralDoes not remove whitespaces Pinmemberevald8018-Jan-10 1:25 
GeneralGood man good Pinmemberniks0412-Jan-10 19:31 
QuestionCan I get MIL HTML parser Algorithm. PinmemberHasibul Haque26-May-09 10:21 
Generalcongratulations Pinmembervukovicg13-May-09 5:03 
GeneralSimply amazing! Pinmemberthe Asocial Ape13-May-09 4:57 
GeneralLowercased href Pinmemberexxellence12-Nov-08 2:04 
Generalfeature missing Pinmemberzeltera17-Aug-08 5:34 
GeneralRe: feature missing Pinmembersmitsc7-Oct-08 9:11 
GeneralDOCTYPE breaks the parser Pinmemberbenblo14-May-08 6:18 
QuestionIs it a bug? Pinmemberhuyhk27-Feb-08 21:57 
I parse this HTML string

<a target='_blank' class=team href=/data/league/team.php?t=610&s=413 class=team>Mariehamn</a>

And got an HTMLElement object with 8 attributes

I think the problem is from href attribute.
GeneralRe: Is it a bug? PinmemberNatural Cause26-Mar-08 23:34 
GeneralRe: Is it a bug? PinmemberNoodleNoggin981-Jul-09 11:03 
GeneralRe: Is it a bug? [modified] PinmemberMember 458246616-Jul-09 13:21 
GeneralRe: Is it a bug? PinmemberJeremy Falcon8-Jul-09 5:50 
GeneralSuggestions for new interface methods PinmemberBerend Engelbrecht26-Feb-08 10:10 
GeneralFound a bug Pinmemberstavinski14-Jan-08 11:09 
AnswerRe: Found a bug - me too, and the solution PinmemberBerend Engelbrecht25-Feb-08 22:04 
QuestionHTML marked Pinmembermaingaosuong25-Sep-07 17:19 
Generalregarding extracting tags Pinmemberrama jayapal29-Mar-07 4:49 
GeneralRe: regarding extracting tags PinmemberJames S.F. Hsieh29-Mar-07 23:09 
GeneralYou can try it. :) PinmemberJames S.F. Hsieh27-Mar-07 23:36 
Generalmisses some IMG nodes Pinmemberencapsul10-Mar-07 8:53 
QuestionStrings instead of Streams? PinmemberYuvi Panda26-Sep-06 7:15 
AnswerRe: Strings instead of Streams? PinmemberLennard Fonteijn1-Dec-06 14:16 
GeneralRe: Strings instead of Streams? PinmemberYuvi Panda1-Dec-06 15:32 
GeneralMove the project elsewhere PinmemberKCorax221-Aug-06 10:55 
QuestionCan not fix some error of HTML code . Pinmemberdinhdv200124-Jul-06 15:36 
GeneralSpaces Removed Between Tags PinmemberMichael Babb6-Jun-06 10:50 
GeneralRe: Spaces Removed Between Tags PinmemberMember 577449914-Dec-08 6:40 
Generala suggestion PinmemberXiongHarry14-Apr-06 23:09 
GeneralMinor error in parsing &lt;!DOCTYPE ..> Pinmemberjmas810916-Mar-06 4:27 
GeneralThis rocks. Pinmemberrhino-x29-Jan-06 12:43 
GeneralGood job! PinmemberBobga4-Nov-05 12:43 
Generalbug with filterindex in vb demo Pinmembermgambrell17-Oct-05 14:37 
GeneralI found some bugs. PinsussNomad Libra7-Sep-05 9:15 
GeneralAttribute with blank name and null value Pinmembervnguyen91121-Jul-05 13:25 
Generaleats special characters PinmemberSteven A. Lowe21-Mar-05 8:45 
GeneralRe: eats special characters PinmemberSteven A. Lowe21-Mar-05 10:38 
Generalmistreats SSI and server scripts PinmemberSteven A. Lowe15-Mar-05 12:21 
GeneralRe: mistreats SSI and server scripts PinmemberSteven A. Lowe17-Mar-05 6:20 
GeneralBug in DOCTYPE Pinmemberarca_21-Feb-05 9:41 
GeneralError when parsing &lt;a href=...&gt; on Pinmembermarshall-cline15-May-04 10:11 
GeneralRe: Error when parsing &lt;a href=...&gt; on PinmemberANWAARAHMADMOON13-Jun-05 1:20 

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