// only used by providers
private static void DependencyRemovedCallbackForFragment(string key, object value, CacheItemRemovedReason reason)
{
Debug.Trace("OutputCache", "DependencyRemovedCallbackForFragment: reason=" + reason + ", key=" + key);
if (reason == CacheItemRemovedReason.DependencyChanged)
{
DependencyCacheEntry dce = value as DependencyCacheEntry;
if (dce.OutputCacheEntryKey != null)
{
try {
OutputCache.RemoveFragment(dce.OutputCacheEntryKey, dce.ProviderName);
}
catch (Exception e) {
HandleErrorWithoutContext(e);
}
}
}
}
// lookup fragment
internal static Object GetFragment(String key, String providerName)
{
// if providerName is null, use default provider.
// if providerName is not null, get it from the provider collection.
// if it's not in the provider or the default provider is undefined,
// check the internal cache (we don't know where it is).
Object result = null;
OutputCacheProvider provider = GetFragmentProvider(providerName);
if (provider != null)
{
result = provider.Get(key);
PartialCachingCacheEntry fragment = result as PartialCachingCacheEntry;
if (fragment != null)
{
if (HasDependencyChanged(true /*isFragment*/, fragment._dependenciesKey, fragment._dependencies, null /*kernelKey*/, key, provider.Name))
{
OutputCache.RemoveFragment(key, provider.Name);
#if DBG
Debug.Trace("OutputCache", "GetFragment(" + key + "," + providerName + ") --> null, " + providerName);
#endif
return(null);
}
}
}
if (result == null)
{
result = HttpRuntime.CacheInternal.Get(key);
#if DBG
string typeName = (result != null) ? result.GetType().Name : "null";
Debug.Trace("OutputCache", "GetFragment(" + key + "," + providerName + ") --> " + typeName + ", CacheInternal");
}
else
{
Debug.Trace("OutputCache", "GetFragment(" + key + "," + providerName + ") --> " + result.GetType().Name + ", " + providerName);
#endif
}
return(result);
}