From: Important IOC Services in EPiServer CMS – EPiServer CMS note.
A list of the most frequent used IOC services for the CMS
Usage
ServiceLocator.Current.GetInstance<ServiceType>();
Services
DisplayChannelService – Handle display channels
IContentLoader – Load Content
IContentRepository – CRUD operations for content
IContentVersionRepository – Handles versions of IContent
ILanguageBranchRepository – Handle language branches
IPageCriteriaQueryService – Searches in content
LocalizationService – Handle translations
PageTypeRepository – CRUD operations for page types
UrlResolver – route helper to get URLs for content