在ASP.NET中解析HTML页面

HtmlWeb web = new HtmlWeb();
HtmlDocument doc = web.Load("http://www.example.com");

HtmlDocument doc = new HtmlDocument();
doc.Load("http://www.example.com");

using (WebClient client = new WebClient())
{
    string html = client.DownloadString("http://www.example.com");
    StringReader sr = new StringReader(html);
    HtmlTextReader htr = new HtmlTextReader(sr);
    HtmlDocument doc = new HtmlDocument();
    doc.Load(htr);
}

using (HttpClient client = new HttpClient())
{
    string html = await client.GetStringAsync("http://www.example.com");
    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(html);
}