Question

I’m writing an ASP.NET application. When a specific kind of request is being handled, I want to schedule a method to be called in a certain number of minutes after the request is handled. The postponed method does not need to communicate with the client that made the original request, it is just intended to do some ‘housekeeping’ work. What is the best way to do this in an ASP.NET context? (It’s ok to not fire the event if the application domain dies for some reason).

Answer 1

In Global.asax use this to check your incoming request:

    protected void Application_BeginRequest(object sender, EventArgs e)     {         CheckRequest(HttpContext.Current.Request);     } 

if your request is valid, register a cache entry:

    private void CheckRequest(HttpRequest request)     {         if (request)             RegisterCacheEntry();     }      private void RegisterCacheEntry()     {         if (HttpRuntime.Cache[CacheItemKey] == null)         {             HttpRuntime.Cache.Add(CacheItemKey, 'your key', null,                  DateTime.Now.AddSeconds(60), //change to fire in whatever time frame you require                 Cache.NoSlidingExpiration,                  CacheItemPriority.NotRemovable,                 new CacheItemRemovedCallback(CacheItemRemovedCallback));         }     } 

then process your function in the callback:

    private void CacheItemRemovedCallback(string key, object value, CacheItemRemovedReason reason)     {         // execute your function      }