csharp/console/DomQuerySelector/Program.cs

#region Copyright

// Copyright © 2024, TeamDev. All rights reserved.
// 
// Redistribution and use in source and/or binary forms, with or without
// modification, must retain the above copyright notice and the following
// disclaimer.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

using System;
using System.Collections.Generic;
using System.Text;
using DotNetBrowser.Browser;
using DotNetBrowser.Dom;
using DotNetBrowser.Engine;

namespace DomQuerySelector
{
    /// <summary>
    ///     This example demonstrates how to use QuerySelector DOM API.
    /// </summary>
    internal class Program
    {
        public static void Main()
        {
            using (IEngine engine = EngineFactory.Create())
            {
                using (IBrowser browser = engine.CreateBrowser())
                {
                    byte[] htmlBytes = Encoding.UTF8.GetBytes("<html><body><div id='root'>"
                                                                  + "<p>paragraph1</p>"
                                                                  + "<p>paragraph2</p>"
                                                                  + "<p>paragraph3</p>"
                                                                  + "</div></body></html>");
                    browser.Navigation
                           .LoadUrl($"data:text/html;base64,{Convert.ToBase64String(htmlBytes)}")
                           .Wait();
                    IDocument document = browser.MainFrame.Document;
                    IElement documentElement = document.DocumentElement;
                    // Get the div with id = "root".
                    INode divRoot = documentElement.GetElementByCssSelector("#root");
                    // Get all paragraphs.
                    IEnumerable<INode> paragraphs = divRoot.GetElementsByCssSelector("p");

                    foreach (INode paragraph in paragraphs)
                    {
                        Console.Out.WriteLine($"paragraph.InnerText = {(paragraph as IElement)?.InnerText}");
                    }
                }
            }

            Console.WriteLine("Press any key to terminate...");
            Console.ReadKey();
        }
    }
}