c#採集網頁用得幾個函數 有解釋

public  string GetHtmlSource(string Url, string charset) //得到Html原始碼
        {
            if (charset == "" || charset == null) charset = "gb2312";
            string text1 = "";
            try
            {
                HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(Url);
                HttpWebResponse response1 = (HttpWebResponse)request1.GetResponse();
                Stream stream1 = response1.GetResponseStream();
                StreamReader reader1 = new StreamReader(stream1, Encoding.GetEncoding(charset));
                text1 = reader1.ReadToEnd();
                stream1.Close();
                response1.Close();
            }
            catch (Exception exception1)
            {
            }
            return text1;
        }

 

//獲得頁面HTML代碼中開始標記和結束標記中間的資料:測試可用

//參    數:HTML原始碼 ,開始標記,結束標記

 public string SniffwebCode(string code, string wordsBegin, string wordsEnd)
        {
            string NewsTitle = "";
            Regex regex1 = new Regex("" + wordsBegin + @"(?<title>[\s\S]+?)" + wordsEnd + "", RegexOptions.Compiled | RegexOptions.IgnoreCase);
            for (Match match1 = regex1.Match(code); match1.Success; match1 = match1.NextMatch())
            {
                NewsTitle = match1.Groups["title"].ToString();
            }
            return NewsTitle;

        }

public ArrayList SniffwebCodeReturnList(string code, string wordsBegin, string wordsEnd)
        {
            ArrayList urlList = new ArrayList();
            //string NewsTitle = "";
            Regex regex1 = new Regex("" + wordsBegin + @"(?<title>[\s\S]+?)" + wordsEnd + "", RegexOptions.Compiled | RegexOptions.IgnoreCase);
            for (Match match1 = regex1.Match(code); match1.Success; match1 = match1.NextMatch())
            {
                urlList.Add(match1.Groups["title"].ToString());
            }
            return urlList;

        }