Create HTML Files in C#

Create an HTML Document with a .NET API

Aspose.HTML for .NET creates a new HTMLDocument with an HTML document tree that an application can populate through the DOM API. Create elements, set their text and attributes, append them to the document, and call Save() to write the finished HTML file.

Create and Save an HTML File in C#

The following example creates a document, sets its title, adds a heading, paragraph, and link to the <body>, and saves the result as created.html.

using Aspose.Html;

using HTMLDocument document = new HTMLDocument();

document.Title = "Product overview";

// Create the visible page elements
HTMLHeadingElement heading =
    (HTMLHeadingElement)document.CreateElement("h1");
heading.TextContent = "Product overview";

HTMLParagraphElement paragraph =
    (HTMLParagraphElement)document.CreateElement("p");
paragraph.TextContent = "Explore the product documentation and examples.";

HTMLAnchorElement link =
    (HTMLAnchorElement)document.CreateElement("a");
link.Href = "https://docs.aspose.com/html/net/";
link.TextContent = "Read the documentation";

// Add the elements in document order
document.Body.AppendChild(heading);
document.Body.AppendChild(paragraph);
document.Body.AppendChild(link);

// Save the completed HTML document
document.Save("created.html");

Steps to Create an HTML File in C#

1. Instantiate HTMLDocument without a source to create a new document.
2. Set document-level data such as the page Title.
3. Create the required nodes with CreateElement() , then set their text, properties, and attributes.
4. Attach the elements to Body or another parent with AppendChild() .
5. Write the completed document with Save() .

HTML Document Creation Capabilities

• Start with a document tree. A new HTMLDocument provides the document structure, including Head and Body, so code can add content to the correct location.
• Create typed HTML elements. CreateElement() produces DOM nodes that can be cast to classes such as HTMLHeadingElement, HTMLParagraphElement, and HTMLAnchorElement when element-specific properties are useful.
• Add text or markup deliberately. Use TextContent for plain text. Use DOM methods or InnerHTML only when the application intentionally supplies markup, and validate markup received from untrusted sources.
• Set attributes and relationships. Configure links, classes, IDs, resource addresses, metadata, and other element data before attaching each node to the document tree.
• Save or continue processing. Save the document as HTML, modify it further with DOM queries, or pass it to a conversion workflow when the required result is PDF, DOCX, XPS, or an image.

HTML Creation Documentation and API Reference

Read Create or Load HTML Documents for examples of creating an empty document, building one from markup, and choosing a base URL. The Edit HTML Document guide explains how to create, insert, replace, and remove DOM nodes. If the application already has a file, URL, string, or stream as its source, use the Load HTML in C# workflow instead.

Get Started with Aspose.HTML for .NET API

Install Aspose.HTML for .NET from NuGet with the .NET CLI:

dotnet add package Aspose.HTML

You can also use the NuGet Package Manager UI or run Install-Package Aspose.HTML in the Package Manager Console. See the installation guide for setup details, or request a temporary license to evaluate the API without evaluation limitations.

HTML Document Creation FAQ

1. Can I convert a newly created HTMLDocument without saving it first?

Yes. Pass the in-memory document to the appropriate Converter.ConvertHTML() overload with the required save options and output path or stream. Saving an intermediate HTML file is not required.

2. Does a new HTMLDocument include <html>, <head>, and <body> elements?

Yes. The parameterless constructor creates the basic HTML document structure. Add metadata and document-level resources to Head, and append visible page content to Body.

3. Does CreateElement() automatically add the new element to the document?

No. CreateElement() creates a detached node. Call AppendChild(), InsertBefore(), or another DOM insertion method to place that node under Head, Body, or an existing element.

4. Should I create a new document when the complete HTML markup already exists in a string?

Use an HTMLDocument constructor that accepts the markup and a base URL. The base URL resolves relative links and resources, while the constructor parses the supplied markup into the DOM.

5. Can the generated HTML reference CSS, images, scripts, and fonts?

Yes. Create the corresponding HTML elements and set their resource URLs or attributes. Make sure relative references are valid for the location where the HTML file and its related resources will be deployed.