c# - 为什么我收到 DocumentElement 不存在的错误？

Question

private void Extract(string url)
{
    HtmlWeb hw = new HtmlWeb();
    HtmlDocument doc = hw.Load(url);
    foreach (HtmlNode link in doc.DocumentElement.SelectNodes("//a[@href]"))
    {

    }
}

我想从 html 文件中提取/解析所有链接。但我收到错误:

Error 8 'HtmlAgilityPack.HtmlDocument' does not contain a definition for 'DocumentElement' and no extension method 'DocumentElement' accepting a first argument of type 'HtmlAgilityPack.HtmlDocument' could be found (are you missing a using directive or an assembly reference?)

编辑**

我这样做了:

private void Extract(string url)
        {
            StreamWriter w = new StreamWriter(@"d:\localpath\test.txt");
            HtmlWeb hw = new HtmlWeb();
            HtmlDocument doc = hw.Load(url);
            foreach (HtmlNode link in doc.DocumentNode.SelectNodes("//a[@href]"))
            {  
                w.WriteLine(link);
            }
            w.Close();
        }

并使用它:

Extract(@"d:\localpath\Sat24_Cloudsheight_Europe.html");

但是我得到的是很多次相同的行:

HtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNodeHtmlAgilityPack.HtmlNode

如何将解析的链接写入文本文件？

Answer 1

将DocumentElement更改为DocumentNode