C#WebBrowser控件 - 在AJAX之后获取文档元素？

using System;
using System.Windows.Forms;

namespace WebBrowserAjaxExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            webBrowser1.DocumentCompleted += WebBrowser1_DocumentCompleted;
        }

        private void WebBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            HtmlDocument document = webBrowser1.Document;
            HtmlElement element = document.GetElementById("elementId");
            if (element != null)
            {
                // 获取元素成功
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            webBrowser1.Navigate("https://example.com");
        }
    }
}