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Example of LoadHtml with CefSharp.OffScreen
// Copyright © 2010-2014 The CefSharp Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using CefSharp.Example;
namespace CefSharp.OffScreen.Example
public class Program
private static ChromiumWebBrowser browser;
public static void Main(string[] args)
const string testUrl = "";
Console.WriteLine("This example application will load {0}, take a screenshot, and save it to your desktop.", testUrl);
Console.WriteLine("You may see a lot of Chromium debugging output, please wait...");
// You need to replace this with your own call to Cef.Initialize();
// Create the offscreen Chromium browser.
browser = new ChromiumWebBrowser();
// An event that is fired when the first page is finished loading.
// This returns to us from another thread.
browser.FrameLoadEnd += BrowserFrameLoadEnd;
// Start loading the test URL in Chrome's thread.
browser.LoadHtml("Hello world", testUrl);
// We have to wait for something, otherwise the process will exit too soon.
// Clean up Chromium objects. You need to call this in your application otherwise
// you will get a crash when closing.
private static void BrowserFrameLoadEnd(object sender, FrameLoadEndEventArgs e)
// Check to ensure it is the main frame which has finished loading
// (rather than an iframe within the main frame).
if (e.IsMainFrame)
// Remove the load event handler, because we only want one snapshot of the initial page.
browser.FrameLoadEnd -= BrowserFrameLoadEnd;
new Task(() =>
// Wait a little bit, because Chrome won't have rendered the new page yet.
// There's no event that tells us when a page has been fully rendered.
// Wait for the screenshot to be taken.
var task = browser.ScreenshotAsync();
// Make a file to save it to (e.g. C:\Users\jan\Desktop\CefSharp screenshot.png)
var screenshotPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "CefSharp screenshot.png");
Console.WriteLine("Screenshot ready. Saving to {0}", screenshotPath);
// Save the Bitmap to the path.
// The image type is auto-detected via the ".png" extension.
// We no longer need the Bitmap.
// Dispose it to avoid keeping the memory alive. Especially important in 32-bit applications.
Console.WriteLine("Screenshot saved. Launching your default image viewer...");
// Tell Windows to launch the saved image.
Console.WriteLine("Image viewer launched. Press any key to exit.");
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