Question

我正在尝试逐步浏览HTML Agility Pack网站上的示例，以学习如何使用它。但是，此示例似乎无法正常工作，我希望获得一些帮助来弄清原因：https://html-agility-pack.net/from-browser

我的代码：

const raw = `[[24297, 'CWCS Sump 002', -121.50842, 38.54798, '2', 'SEWER SUMP'],[8035, 'CWCS Sump 002A (56)', -121.50842, 38.54798, '2A', 'SEWER SUMP'],[9334, 'CWCS Sump 001', -121.5110297, 38.5703431, '1', 'SEWER SUMP']]`;

const res = JSON.parse(raw.replace(/(?<!\\)'/g, `"`));
console.log(res);

我收到的错误是：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            getWebsite();
        }
        private void getWebsite()
        {
            string url = "http://html-agility-pack/from-browser";

            var web1 = new HtmlWeb();
            var doc1 = web1.LoadFromBrowser(url, o =>
            {
                var webBrowser = (WebBrowser)o;

                // WAIT until the dynamic text is set
                return !string.IsNullOrEmpty(webBrowser.Document.GetElementById("uiDynamicText").InnerText);
            });
            var t1 = doc1.DocumentNode.SelectSingleNode("//div[@id='uiDynamicText']").InnerText;

            var web2 = new HtmlWeb();
            var doc2 = web2.LoadFromBrowser(url, html =>
            {
                // WAIT until the dynamic text is set
                return !html.Contains("<div id=\"uiDynamicText\"></div>");
            });
            var t2 = doc2.DocumentNode.SelectSingleNode("//div[@id='uiDynamicText']").InnerText;  
        }
    }

具体来说，错误显示在此行上：

System.NullReferenceException: 'Object reference not set to an instance of an object.'
System.Windows.Forms.HtmlDocument.GetElementById(...) returned null.

我仔细检查了一下，据我所知，我的代码与示例相同。我在哪里错了？

来自浏览器的HTML Agility Pack加载示例返回空值

0 个答案: