A good reason to make a post!

Nothing really to say here, I just wanted to force an update to my blog so that a HttpCacheDependency class (derived from Whidbey’s CacheDependency class) had something to check for updates to trigger a cache expiry (update: It worked, code attached).

public class HttpCacheDependency : System.Web.Caching.CacheDependency
    private string m_ContentOnFile;
    private string m_Url;
    public HttpCacheDependency(string url)
        this.m_Url = url;
        this.m_ContentOnFile = this.GetContent(url);

        TimerCallback callback = new TimerCallback(this.m_Timer_Callback);
        this.m_Timer = new Timer(
callback, null, TimeSpan.FromMinutes(1), TimeSpan.FromMinutes(1));

    private Timer m_Timer;
    private void m_Timer_Callback(object obj)
        string newContent = this.GetContent(this.m_Url);
        if (this.m_ContentOnFile != newContent)
            this.m_ContentOnFile = newContent;
            this.NotifyDependencyChanged(this, new EventArgs());

    private string GetContent(string url)
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        StreamReader reader = new StreamReader(response.GetResponseStream());
        string content = reader.ReadToEnd();

        return content;

I can imagine that this would be useful for things like those web-based RSS feeders or other content aggregation services.


2 thoughts on “A good reason to make a post!

  1. Clarke Scott

    (I a Monty Python voice)

    “You lucky bastard. You lucky, lucky bastard.”

    Can’t wait for Whidbey!

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