Can Puppeteer-Sharp run in headless mode?

Yes, Puppeteer-Sharp, which is a .NET port of the Node.js library Puppeteer, can indeed run in headless mode. Running a browser in headless mode means that the browser is running without a graphical user interface, which is particularly useful for automated tasks, such as web scraping or automated testing, where you do not need to visually see the web pages being manipulated.

By default, Puppeteer-Sharp runs the browser in headless mode. However, you can specify whether to run in headless or headful (non-headless) mode using the Headless property in the LaunchOptions class when you launch the browser.

Here is an example of how to run Puppeteer-Sharp in headless mode:

using System;
using System.Threading.Tasks;
using PuppeteerSharp;

class Program
{
    public static async Task Main(string[] args)
    {
        await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
        var options = new LaunchOptions
        {
            Headless = true // This line is actually optional as headless is the default
        };

        using (var browser = await Puppeteer.LaunchAsync(options))
        using (var page = await browser.NewPageAsync())
        {
            await page.GoToAsync("http://example.com");
            var content = await page.GetContentAsync();
            Console.WriteLine(content);
            // You can perform other automation tasks here
        }
    }
}

In this example, the LaunchOptions object is configured with Headless = true to explicitly state that the browser should run in headless mode. However, since headless mode is the default, you could omit this line, and Puppeteer-Sharp would still run the browser headlessly.

To run Puppeteer-Sharp in headful mode (i.e., with a GUI), you would set Headless = false:

var options = new LaunchOptions
{
    Headless = false
};

Remember that when running in headless mode, certain browser features that depend on a graphical environment may not work as expected. However, for most web automation and scraping tasks, headless mode offers a lightweight and faster alternative to headful mode.