CODEWITHSUNDEEP
c#.netasp.net
Cas Sakal
Cas Sakal

Reputation: 213

Validating HTML Tags in a String in C#

Assume that we have the following HTML strings.

string A = " <table width=325><tr><td width=325>test</td></tr></table>"
string B = " <<table width=325><tr><td width=325>test</td></table>"

How can we validate A or B in C# according to HTML specifications?

A should return true whereas B should return false.

Upvotes: 6

Views: 17748

Answers (3)

sikender
sikender

Reputation: 5921

For this specific case you can use HTML Agility Pack to assert if the HTML is well formed or if you have tags not opened.

var htmlDoc = new HtmlDocument();

htmlDoc.LoadHtml(
    "WAVEFORM</u> YES, <u>NEGATIVE AUSCULTATION OF EPIGASTRUM</u> YES,");

foreach (var error in htmlDoc.ParseErrors)
{
    // Prints: TagNotOpened
    Console.WriteLine(error.Code);
    // Prints: Start tag <u> was not found
    Console.WriteLine(error.Reason); 
}

Checking a HTML string for unopened tags

Upvotes: 15

rohit89
rohit89

Reputation: 5773

http://web.archive.org/web/20110820163031/http://markbeaton.com/SoftwareInfo.aspx?ID=81a0ecd0-c41c-48da-8a39-f10c8aa3f931

Github link: https://github.com/markbeaton/TidyManaged

This guy has written a .NET wrapper for HTMLTidy. I haven't used it but it may be what you are looking for.

Upvotes: 0

thekip
thekip

Reputation: 3768

One point to start with is checking if it's valid XML.

by the way, I think both your examples are incorrect as you've left out the </tr> from both.

Upvotes: 1

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