读取一条网址内的内容

[Gomes]

在textbox里输入https://forum.csdn.net/BList/DotNET/，然后就显示该页面的HTML代码出来。并且查询到<span id="test">fdafds</span>标签内的内容fdafds.

[雨师88]

HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(new Uri(url));
webRequest2.CookieContainer = webcookies["1"];
HttpWebResponse rsps = (HttpWebResponse)webRequest2.GetResponse();
StreamReader sr = new StreamReader(rsps.GetResponseStream(), Encoding.UTF8);
html = sr.ReadToEnd();
sr.Close();
string patten="id=\"test\">(?<value>)</span>";
Regex r = new Regex(patten, RegexOptions.IgnoreCase);
MatchCollection collections = r.Matches(html);

[Gomes]

string patten="id=\"test\">(?<value>)</span>";
Regex r = new Regex(patten, RegexOptions.IgnoreCase);
MatchCollection collections = r.Matches(html);
这个如何输入得到标签里的value？

[Gomes]

HTML代码已经可以获取到，但是string字符的长度不够。该怎么办。