shili.txt

一般我们总有一些需要缓存,定时更新,失败了也不怕的一些数据。这种东西在我们的软件架构中非常实用

public class Top18List
{
    private static Top18List instance = null;
    private static string P8Url = ConfigurationManager.AppSettings["p8url"];

    private string[] urls;
    private string[] names;
    private DateTime updatetime;
    public string[] this[int index]{
        get
        {
            return new string[] {urls[index],names[index]};
        }
    }
    private Top18List()
    {
        getUrlsAndNames();
    }
    private void getUrlsAndNames()
    {
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(P8Url
);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse(
);
            Stream s = response.GetResponseStream();
            string x = "";
            if (response.ContentEncoding == "gzip")
            {
                x = new StreamReader(new GZipStream(s, CompressionMode.Decom
press), Encoding.GetEncoding("gbk")).ReadToEnd();
            }
            else
            {
                x = new StreamReader(s, Encoding.GetEncoding("gbk")).ReadToE
nd();
            }
            Regex reg = new Regex(@"<a href=""(?<link>[^""]+)"" [^>]+>·(?<n
ame>[^<]+)</a>");
            Match m = reg.Match(x);
            List<string> listUrls = new List<string>();
            List<string> listNames = new List<string>();
            while (m.Success)
            {
                listUrls.Add(m.Groups["link"].Value);
                listNames.Add(m.Groups["name"].Value);
                m = m.NextMatch();
            }
            urls = listUrls.ToArray();
            names = listNames.ToArray();
            s.Close();
            response.Close();
        }
        catch (Exception e)
        {
            Trace.Write(DateTime.Now);
            Trace.WriteLine(e.Source);
            Trace.WriteLine(e.Message);
            Trace.WriteLine(e.StackTrace);
        }
        updatetime = DateTime.Now;
    }
    public static Top18List getInstance()
    {
        if (instance == null)
        {
            instance = new Top18List();
        }
        else
        {
            if (instance.updatetime.AddMinutes(60) < DateTime.Now)
            {
                instance.getUrlsAndNames();
            }
        }
        return instance;
    }
}