https://learn.microsoft.com/en-us/dotnet/api/system.data.entity.core.common.commandtrees.dbfunctionexpression?view=entity-framework-6.2.0
DbFunctionExpression Class (System.Data.Entity.Core.Common.CommandTrees) | Microsoft Learn
Represents an invocation of a function. This class cannot be inherited.
class systemdataentitycorecommon