amaitland/Program.cs

## Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CefSharp.OffScreen;
using System.Drawing;
using System.Drawing.Imaging;

namespace CefSharp.Offscreen.ScreenshotTest
{
    class Program
    {

        static Program()
        {
            var settings = new CefSettings();
            settings.WindowlessRenderingEnabled = true;

            if (!Cef.Initialize(settings))
            {
                Console.WriteLine("Failed to initialize Cef");
            }
        }

        static void Main(string[] args)
        {
            Run();

            Console.ReadKey();

            Cef.Shutdown();
        }

        static async Task Run()
        {
            Size size = new Size(100, 100);

            IEnumerable<Task> tasks = Enumerable.Range(0, 10).Select(i =>
            {
                return Task.Run(async () =>
                {
                    Console.WriteLine("Create image: " + i);

                    Bitmap image = await CreateImage("<!doctype html><html><head></head><body>" + i + "</body></html>", size);

                    Console.WriteLine("Finished image: " + i);

                    string filename = Guid.NewGuid().ToString("N") + ".png";

                    image.Save(".\\" + filename, ImageFormat.Png);
                });
            });

            await Task.WhenAll(tasks);

            Console.WriteLine("Finished processing all tasks");
        }

        static async Task<Bitmap> CreateImage(string html, Size size)
        {
            var settings = new BrowserSettings();
            settings.WindowlessFrameRate = 1;

            using (var chromium = new ChromiumWebBrowser(browserSettings: settings))
            {
                chromium.Size = size;

                var tcs = new TaskCompletionSource<bool>();

                EventHandler<LoadingStateChangedEventArgs> loadingHandler = null;
                loadingHandler = new EventHandler<LoadingStateChangedEventArgs>((object sender, LoadingStateChangedEventArgs e) =>
                {
                    if (!e.IsLoading)
                    {
                        chromium.LoadingStateChanged -= loadingHandler;

                        tcs.TrySetResult(true);
                    }
                });
                chromium.LoadingStateChanged += loadingHandler;

                EventHandler initializedHandler = null;
                initializedHandler = new EventHandler((object sender, EventArgs e) =>
                {
                    chromium.BrowserInitialized -= initializedHandler;

                    chromium.LoadHtml(html, "http://localhost");
                });
                chromium.BrowserInitialized += initializedHandler;

                await tcs.Task;

                return await chromium.ScreenshotAsync();
            }
        }

    }
}
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Threading.Tasks;
	using CefSharp.OffScreen;
	using System.Drawing;
	using System.Drawing.Imaging;

	namespace CefSharp.Offscreen.ScreenshotTest
	{
	class Program
	{

	static Program()
	{
	var settings = new CefSettings();
	settings.WindowlessRenderingEnabled = true;

	if (!Cef.Initialize(settings))
	{
	Console.WriteLine("Failed to initialize Cef");
	}
	}

	static void Main(string[] args)
	{
	Run();

	Console.ReadKey();

	Cef.Shutdown();
	}

	static async Task Run()
	{
	Size size = new Size(100, 100);

	IEnumerable<Task> tasks = Enumerable.Range(0, 10).Select(i =>
	{
	return Task.Run(async () =>
	{
	Console.WriteLine("Create image: " + i);

	Bitmap image = await CreateImage("<!doctype html><html><head></head><body>" + i + "</body></html>", size);

	Console.WriteLine("Finished image: " + i);

	string filename = Guid.NewGuid().ToString("N") + ".png";

	image.Save(".\\" + filename, ImageFormat.Png);
	});
	});

	await Task.WhenAll(tasks);

	Console.WriteLine("Finished processing all tasks");
	}

	static async Task<Bitmap> CreateImage(string html, Size size)
	{
	var settings = new BrowserSettings();
	settings.WindowlessFrameRate = 1;

	using (var chromium = new ChromiumWebBrowser(browserSettings: settings))
	{
	chromium.Size = size;

	var tcs = new TaskCompletionSource<bool>();

	EventHandler<LoadingStateChangedEventArgs> loadingHandler = null;
	loadingHandler = new EventHandler<LoadingStateChangedEventArgs>((object sender, LoadingStateChangedEventArgs e) =>
	{
	if (!e.IsLoading)
	{
	chromium.LoadingStateChanged -= loadingHandler;

	tcs.TrySetResult(true);
	}
	});
	chromium.LoadingStateChanged += loadingHandler;

	EventHandler initializedHandler = null;
	initializedHandler = new EventHandler((object sender, EventArgs e) =>
	{
	chromium.BrowserInitialized -= initializedHandler;

	chromium.LoadHtml(html, "http://localhost");
	});
	chromium.BrowserInitialized += initializedHandler;

	await tcs.Task;

	return await chromium.ScreenshotAsync();
	}
	}

	}
	}