ClearProviderPagesFromCache is never called directly from EPiServer. It is method that custom implementers can call to flush all pages from a specific PageProvider.

 If your custom object is dependent on a specific page then you would add a cache dependency to that page when the custom object is added to cache. Then you could have some code like:

string pageCacheKey = DataFactoryCache.PageCommonCacheKey(pageLink);
CacheManager.RuntimeCacheInsert("yourkey", yourObject, new CacheDependency  (null, new string[1]{pageCacheKey}));

If you want your cached object to be removed when all pages from the page providers is removed (e.g. when whole Page cache is cleared e.g. by a change in a PageType etc or when somebody calls ClearProviderPagesFromCache) then you would add a dependency to the common key for the provider like:

string commonProviderKey = "EPPageProvider:" + ProviderKey;
CacheManager.RuntimeCacheInsert("yourkey", yourObject, new CacheDependency  (null, new string[1]{commonProviderKey}));

Ps.

Unfortunately is the property ProviderCacheKey on PageProviderBase private which is why you have to construct it yourself as in commonProviderKey above. I have added a bug that we should change it to public.

Ds.

Thanks Johan

The second proposal was what I was looking for. In the end though I have solved with my own ClearCache() method where I clear my cached object and also call ClearProviderPagesFromCache().

The problem I got when adding the CacheDependency was that my cached object was cleared everytime when pages where added to the ProviderCache.

/Hans