Markdig for C# (.NET): Complete Guide

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Markdig is a high-performance, fully managed Markdown parser for the .NET platform, written in C#. It provides developers with a powerful and flexible tool for converting Markdown text to HTML, XAML, and other formats. Unlike many other libraries, Markdig is designed with a focus on performance, extensibility, and strict compliance with CommonMark specifications. This makes it an ideal choice for building content management systems, blogs, documentation sites, chat applications, and any other projects that require Markdown processing.

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Why is this library needed? In modern web development, Markdown has become the de facto standard for writing documentation, articles, and messages. However, to display it in a browser, it must be converted to HTML. Markdig solves this task quickly and efficiently. Additionally, it supports many extensions such as tables, footnotes, strikethrough text, auto-links, emojis (via additional packages), and much more that goes beyond basic CommonMark. You can easily customize the processing pipeline by enabling only the extensions you need, allowing you to control both functionality and performance.

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Markdig is also known for its reliability. It is actively used in major projects such as the static site generator Statiq, the documentation platform DocFX, and many others. Thanks to its modular architecture, you can not only use built-in extensions but also create your own, opening up virtually limitless customization possibilities. In this article, we will cover installation, main methods, provide practical examples, and give tips for effective use of Markdig.

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Installation

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Installing Markdig in a .NET project is done via the NuGet package manager. You can use the Package Manager Console, the Visual Studio interface, or the .NET CLI. All three methods are shown below.

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Via .NET CLI (recommended):

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dotnet add package Markdig

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Via Package Manager Console:

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Install-Package Markdig

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Via Visual Studio interface:
\nOpen "Manage NuGet Packages" (right-click on project -> Manage NuGet Packages), search for "Markdig" and click "Install".

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After installation, a reference to the Markdig.dll assembly will be added to your project, and you can start using the library.

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Quick Start

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Let's start with the simplest example: converting a Markdown string to HTML.

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using Markdig;\n\nstring markdownContent = "# Hello, world!\\n\\nThis is **bold** text and *italic*.";\nstring htmlContent = Markdown.ToHtml(markdownContent);\n\nConsole.WriteLine(htmlContent);\n// Output:\n// <h1>Hello, world!</h1>\n// <p>This is <strong>bold</strong> text and <em>italic</em>.</p>\n

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As you can see, it's very simple. The static method Markdown.ToHtml() does all the work for you. However, this is just the tip of the iceberg. Next, we will explore more advanced features.

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Main Methods and Classes

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For more fine-grained control over Markdown processing, Markdig provides a set of classes and methods. Let's look at 8 key ones.

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1. Markdown.ToHtml(string markdown)

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Signature: public static string ToHtml(string markdown)

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What it does: Converts a Markdown string to an HTML string using the default pipeline with standard CommonMark extensions.

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string html = Markdown.ToHtml("**Hello** *World*");\nConsole.WriteLine(html); // <p>