C# HTML

Hypertext markup language: HTML

HTML is everywhere. For this reason, being able to process it is important. The .NET Framework has the tools necessary for basic and advanced manipulation and creation of HTML, using regular expressions, StringBuilder and strings.

HTML is the publishing language of the World Wide Web. World Wide Web Consortium

HtmlTextWriter

There are many ways of handling HTML in the C# programming language. In this introductory program, we use the HtmlTextWriter type, which is an abstract data type for generating HTML markup.

HtmlTextWriter

Next:In this example we see that a span tag is opened and closed by the HtmlTextWriter.

Program that writes HTML: C#

using System;
using System.IO;
using System.Web.UI;

class Program
{
    static void Main()
    {
	using (StringWriter stringWriter = new StringWriter())
	using (HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter))
	{
	    htmlWriter.RenderBeginTag(HtmlTextWriterTag.Span);
	    htmlWriter.Write("Perls");
	    htmlWriter.RenderEndTag();
	    Console.WriteLine(stringWriter);
	}
    }
}

Output

<span>Perls</span>

Manipulate

P tag in HTML

We show how to manipulate, generate, or remove HTML markup using the C# language. You can also encode entities in HTML. Often the simplest way to handle HTML is with regular expressions, but this sometimes causes problems.

HtmlEncode and HtmlDecodeHttpUtility.HtmlEncode MethodsParagraph HTML RegexRemove HTML TagsTitle From HTML

Validate:A lot of HTML is invalid.
You can detect invalid HTML using the C# language.
I provide an algorithm.

HTML Brackets: Validation

Scrape

The term scraping means to download web pages and then scan the text and take parts into another application. You can use a C# program to scrape HTML links from web pages. This can be used to gather information from third-party sources.

Scrape HTML

Colors

Color type

Many different named colors are available in the hypertext markup language. These can also be specified directly inside CSS files. We print out all the HTML colors using the C# language.

Color Table

Summary

C# programming language

In the real world, parsing HTML is fairly difficult because we must support badly formed markup. On the other hand, XML is easy to parse because it has strict rules for correctness.

Note:If you need to store data, using XML is often better than HTML. It is easier to handle in code.

XML

C#: File