How do I validate a html file with C#?

Question

I have a C# application that receives an html file. I want to parse and validate it. On output it will return a list of errors or that my html is valid.

Has anyone any idea how can I do this?

possible duplicate of What is the best way to parse html in C#? — Pranay Rana
– Pranay Rana, Commented Oct 4, 2010 at 9:11
The validation part of this question makes it quite distinct from questions about simply parsing HTML. — Quentin
– Quentin, Commented Oct 4, 2010 at 9:15
That's right, I'm not interested in parsing html, I'm interested in validate it for possible errors. — Jeff Norman
– Jeff Norman, Commented Oct 4, 2010 at 9:32

Quentin · Accepted Answer · 2010-10-04 09:14:53Z

11

I'd run a local instance of the W3C Markup Validation service and communicate with it via the API

answered Oct 4, 2010 at 9:14

Quentin

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1 Comment

Dave Over a year ago

I was not aware there was an API for this, nice find.

gcores · Accepted Answer · 2010-10-04 09:16:26Z

3

You can use HTML Tidy. There is a wrapper for .NET called TidyManaged

answered Oct 4, 2010 at 9:16

gcores

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2 Comments

Jeff Norman Over a year ago

TidyManaged does not give any functional dll

kettlecrab Over a year ago

Some issues were filed about this, including that the file output doesn't even work (and I confirmed it, despite it apparently being patched already). On the issues page is a link to a version by freethenation that works and requires libtidy32.dll and libtidy64.dll, so I followed gcores's link above and renamed the 32 and 64-bit versions appropriately. Took awhile to figure out, so I thought I'd post that here.

Timothy S. Van Haren · Accepted Answer · 2015-04-06 16:42:51Z

1

There is an obscure DLL in the framework version 1.0 (!) Microsoft.mshtml.dll and that is the only way in the framework to deal with DOM. If HTML is XHTML and a valid XML, then you can use XML but otherwise this is the only chance.

edited Apr 6, 2015 at 16:42

Timothy S. Van Haren

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answered Oct 4, 2010 at 9:09

Aliostad

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4 Comments

Quentin Over a year ago

I'd be amazed that that was the only way to deal with DOM.

Jeff Norman Over a year ago

hmmm, explain me how can you can validate an very elaborate html file with xml. I thought about that too, and I think it's not the best way.

Quentin Over a year ago

In what framework? Nobody mentioned a framework. (Oh, and must we resort to name calling?)

Hans Passant Over a year ago

It's not so obscure, it the PIA for Internet Explorer. Not part of the framework, it's a COM interop library. Whether IE is a good validator for HTML is, ahem, debatable.

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