使用Html Agility Pack选择子节点时出现问题

csharp
using HtmlAgilityPack;
class Program
{
    static void Main(string[] args)
    {
        var html = @"
            
                
                    
                        
标题
                        
                            
项目1
                            
项目2
                            
项目3
                        
                    
                
            ";
        var doc = new HtmlDocument();
        doc.LoadHtml(html);
        var container = doc.DocumentNode.SelectSingleNode("//div[@class='container']");
        var ul = container.SelectSingleNode("ul");
        var lis = ul.SelectNodes("li");
        foreach (var li in lis)
        {
            Console.WriteLine(li.InnerText);
        }
    }
}

csharp
using HtmlAgilityPack;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
class Program
{
    static void Main(string[] args)
    {
        var chromeDriverPath = "path_to_chromedriver.exe";
        var chromeOptions = new ChromeOptions();
        chromeOptions.AddArguments("--headless");
        using (var driver = new ChromeDriver(chromeDriverPath, chromeOptions))
        {
            driver.Navigate().GoToUrl("https://example.com");
            var html = driver.PageSource;
            var doc = new HtmlDocument();
            doc.LoadHtml(html);
            var links = doc.DocumentNode.SelectNodes("//a[@href]");
            foreach (var link in links)
            {
                Console.WriteLine(link.GetAttributeValue("href", ""));
            }
        }
    }
}