How to Parse CSS in C# Using System.Web.UI.WebControls.Style or Roslyn?

Parsing CSS in C#

In order to manipulate or process CSS within a C# application, you'll need to parse it into an in-memory object format.

Method 1: Using System.Web.UI.WebControls.Style

The System.Web.UI.WebControls.Style class can be used to parse CSS stylesheets. It provides methods for loading, parsing, and managing CSS rules and properties. Here's an example:

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

// Load the CSS file
var style = new Style();
style.Load(new StringReader(File.ReadAllText("stylesheet.css")));

// Access CSS rules and properties
Console.WriteLine(style.GetPropertyValue("font-family"));

Method 2: Using Roslyn

Roslyn is a compiler framework that can be used for code analysis and manipulation. It includes a CSS parser that can be accessed through the Microsoft.CodeAnalysis.CSS namespace. Here's an example:

using Microsoft.CodeAnalysis.CSS;

// Parse the CSS file
var cssTree = CSSSyntaxTree.ParseText(File.ReadAllText("stylesheet.css"));

// Access CSS rules and properties
var rules = cssTree.Root.Rules;

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