https://learn.microsoft.com/en-us/dotnet/api/system.data.entity.dbfunctions?view=entity-framework-6.2.0&redirectedfrom=MSDN
DbFunctions Class (System.Data.Entity) | Microsoft Learn
Provides common language runtime (CLR) methods that expose EDM canonical functions for use in DbContext or ObjectContext LINQ to Entities queries.
class systemdataentitymicrosoftlearn