Obtaining a cache dependency key

Normally we then want to invalidate the cached model if the current content has changed, i.e. a new version is published.

To achieve this we need to obtain a version cache key using the IContentCacheKeyCreator interface:

IContentCacheKeyCreator.CreateVersionCacheKey(contentLink) 

However, this will only work if the contentLink provided contains the necessary version info, meaning both the published version and a work id.

The code sample below show how that can be done for catalog node content:

var currentNodeContentLink = _referenceConverter.GetContentLink(catalogNodeId, 
       CatalogContentType.CatalogNode, 0); // 0 = published version

var versionCacheKey = GetVersionKey(currentNodeContentLink);

....

public string GetVersionKey(ContentReference contentLink)
{
  var versionCacheKey = string.Empty;
  var latestPublishedVersion = _contentVersionRepository.List(contentLink).ToList()
  .FirstOrDefault(v => v.Status == VersionStatus.Published);
  
  if (latestPublishedVersion != null)
  {
     // adding current published version to cache key
     versionCacheKey = _cacheKeyCreator.CreateVersionCacheKey(latestPublishedVersion.ContentLink);
  }

  return versionCacheKey;
}