ASP.NET Clear Cache

Question

If you cache pages in a HttpHandler with

_context.Response.Cache.SetCacheability(HttpCacheability.Public);
_context.Response.Cache.SetExpires(DateTime.Now.AddSeconds(180));

is it possible to clear a certain page from the cache?

Answer 1

is it possible to Clear a certain page from the Cache?

Yes:

HttpResponse.RemoveOutputCacheItem("/pages/default.aspx");

You can also use Cache dependencies to remove pages from the Cache:

this.Response.AddCacheItemDependency("key");

After making that call, if you modify Cache["key"], it will cause the page to be removed from the Cache.

In case it might help, I cover caching in detail in my book: Ultra-Fast ASP.NET.

Answer 2

more simple one...

public static void ClearCache()
{
    Cache cache = HttpRuntime.Cache;

    IDictionaryEnumerator dictionaryEnumerators = cache.GetEnumerator();

    foreach (string key in (IEnumerable<string>) dictionaryEnumerators.Key)
    {
        cache.Remove(key);
    }

}