Author Archives:

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 

Posted in Entity Framework, NHibernate | 49 Comments

AutoMapper 3.2.0 released

Full release notes on the GitHub site Big features/improvements: LINQ queryable extensions greatly improved ICollection supported MaxDepth supported Custom MapFrom expressions supported (including aggregations) Inherited mapping configuration applied Windows Universal Apps supported Fixed NuGet package to not have DLL in … Continue reading 

Posted in AutoMapper | 17 Comments

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 

Posted in AutoMapper, Entity Framework, NHibernate | 8 Comments

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 

Posted in AutoMapper, Entity Framework, NHibernate | 13 Comments

Successful IoC container usage

Every now and again I here the meme of IoC containers being bad, they lead to bad developer practices, they’re too complicated and on and on. IoC containers – like any sharp tool – can be easily abused. Dependency injection, … Continue reading 

Posted in Dependency Injection, OO | 25 Comments

Avoid many-to-many mappings in ORMs

Going through and reviewing the Contoso University codebase, really to get caught up on EF 6 features, I found a relationship between two tables that resulted in a many-to-many mapping. We have these tables: A Course can have many Instructors, … Continue reading 

Posted in Entity Framework, NHibernate | 13 Comments

Efficient querying with LINQ, AutoMapper and Future queries

Even after all these years, I’m still a big fan of ORMs. One common complaint over the years is people using ORMs use the tool identically for both reads and writes. With writes, I want tracked entities, managed relationships, cascades … Continue reading 

Posted in AutoMapper, Entity Framework, LINQ | 30 Comments

Reducing NServiceBus Saga load

When presented with concurrency issues with NServiceBus sagas, you’re generally presented with two options: Relax the transaction isolation level Reduce worker thread count, forcing serialized processing of messages Both of these are generally not a great solution, as neither actually … Continue reading 

Posted in NServiceBus | 10 Comments

Converting AutoMapper to a Portable Class Library

In the early days of AutoMapper, I got requests to support AutoMapper in other platforms (mainly Silverlight). I didn’t have any experience in those other platforms, but I thought it would be easy. It was not. I wound up with … Continue reading 

Posted in AutoMapper | 5 Comments

Rendering ASP.NET content as PDF

I work on quite a few line of business applications, and a common ask is for printable reports. I could use a tool like SQL Server Reporting Services, but to be honest the report building and styling of those tools … Continue reading 

Posted in ASP.NET MVC | 33 Comments