C#用Htmlagilitypack如何获取标签节点里的元素?

{
            HtmlWeb abc = new HtmlWeb();  
            HtmlDocument def= abc.Load("https://www.iwon4032.com/games/PSport.aspx");  
            HtmlNodeCollection aaa = def.DocumentNode.SelectNodes("//a[@class]/span");  //这里是不是获取a标签直到/span里的元素?
       // Console.WriteLine(aaa.ToString());
            if (aaa != null)   //判断不为空
            {
                foreach (var item in aaa)  //遍历 
                {
                    Console.WriteLine(item.InnerText);   
                }
            }
            Console.Read();
        }