Category Archives: EntityFramework

Entity Framework extensions for AutoMapper

I pushed out a little library I’ve been using for the last couple years for helping to use AutoMapper and Entity Framework together. It’s a series of extension methods that cuts down the number of calls going from a DbSet … Continue reading 


Missing EF Feature Workarounds: Filters

Filters are one of those ORM features that when you need it, you REALLY need it. NHibernate has had this feature for quite a long time, but it still doesn’t exist in EF. What are filters? In NHibernate, a filter … Continue reading 


A better domain events pattern

Domain events are one of the final patterns needed to create a fully encapsulated domain model – one that fully enforces a consistency boundary and invariants. The need for domain events comes from a desire to inject services into domain … Continue reading 


Missing EF Feature Workarounds: Encapsulated collections

The list of missing EF features is quite long, but several of the items in the list do have workarounds. For encapsulated domain models that enforce their own consistency boundary, encapsulating a collection is quite important to ensure your domain … Continue reading 


Missing EF Feature Workarounds: Cascade delete orphans

Currently, Entity Framework cannot cascade delete orphans. In fact, there’s not a real concept of parent-child relationships, there’s only navigation properties, collection properties, and a notion of required/optional relationships. You can cascade delete if a parent is deleted, but if … Continue reading 


Missing NHibernate features in Entity Framework

Recently I blogged about migrating to EF from NHibernate and how easy it is to create fully encapsulated models mapped to EF. In this particular project, migrating was relatively painless, as it was a fairly new schema and quite amenable … Continue reading 


Domain modeling with Entity Framework scorecard

A long, long time ago I had a series on strengthening your domain, highlighting how simple refactoring tools and code smells can help guide your models to push behavior down into your core domain model/business objects/whatever. All the techniques highlighted … Continue reading 


Migrating from NHibernate to Entity Framework

I’ve been a supporter and user of NHibernate for nearly 10 years. While not part of the original NHibernate Mafia, I’ve long enjoyed NHibernate’s ability to rich, behavioral domain models. I wasn’t happy with the initial designs of Entity Framework, … Continue reading 


Using AutoMapper to perform LINQ aggregations

In the last post I showed how AutoMapper and its LINQ projection can prevent SELECT N+1 problems and other lazy loading problems. That was pretty cool, but wait, there’s more! What about complex aggregation? LINQ can support all sorts of … Continue reading 


Using AutoMapper to prevent SELECT N+1 problems

Back in my post about efficient querying with AutoMapper, LINQ and future queries, one piece I glossed over was how View Models and LINQ projection can prevent SELECT N+1 problems. In the original controller action, I had code like this: … Continue reading