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• ASP.NET MVC
• Austin DDD Book Club
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• Rant
• Refactoring
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• Services in Domain-Driven Design

  Services are first-class citizens of the domain model. When concepts of the model would distort any Entity or Value Object, a Service is appropriate. From Evans' DDD, a good Service has these characteristics: The operation relates to a domain concept... Posted Aug 21 2008, 08:07 AM by bogardj with | with 4 comment(s) Filed under: Domain-Driven Design

• DDD, Repositories and ORMs

  One of the confusing aspects of those new to DDD is the concept of a Repository. From Fowler's Patterns of Enterprise Application Architecture, a Repository: Mediates between the domain and data mapping layers using a collection-like interface for... Posted Aug 19 2008, 10:31 PM by bogardj with | with 22 comment(s) Filed under: Domain-Driven Design

• Austin DDD Book Club wrapped up

  The last Austin DDD Book Club meeting came and went today, finishing up with the last couple of chapters in Evans' excellent Domain-Driven Design book (covering Chapter 17, Bringing the Strategy Together and the Conclusion). I want to thank our hosts... Posted Aug 14 2008, 09:37 PM by bogardj with | with 5 comment(s) Filed under: Domain-Driven Design, Austin DDD Book Club

• Enumeration classes

  A question came up on the ALT.NET message board asking whether Value Objects should be used across service boundaries. Of course, the conversation took several detours, eventually coming to the question, "what do you do about enumerations crossing... Posted Aug 12 2008, 08:05 AM by bogardj with | with 29 comment(s) Filed under: Domain-Driven Design, C#

• Entities and the Law of Demeter

  The Law of Demeter , and its corresponding code smell, Inappropriate Intimacy , are some of the best bang-for-your-buck code smells that you can address. The basic idea behind each of these concepts is code related to an object should probably be inside... Posted Jul 07 2008, 07:51 AM by bogardj with | with 14 comment(s) Filed under: Domain-Driven Design, Refactoring

• Designing primary keys

  When creating a primary key for a table, we have a few options: Composite key Natural key Surrogate key Each has their own advantages and disadvantages, but by and large I always wind up going with the last option. Composite keys Composite keys are primary... Posted Jun 04 2008, 10:01 PM by bogardj with | with 24 comment(s) Filed under: Domain-Driven Design, SQL

• The MVC Storefront Challenge!

  In Rob Conery's recent post on the MVC Storefront example he's been working on, he got some comment to basically toss out Linq2SQL and use NHibernate instead. Blah. How about the community does it instead? I'm not looking for an us vs. them... Posted May 20 2008, 11:25 PM by bogardj with | with 14 comment(s) Filed under: Domain-Driven Design, LINQ to SQL, ASP.NET MVC

• Entities, Value Objects, Aggregates and Roots

  Taking a small detour before I deliver the first installment in the Domain-Driven Design: Supple Design Patterns series, I'd like to cover the basic elements of Domain-Driven Design modeling: Entities Value Objects Aggregates and Roots I'd like... Posted May 20 2008, 10:59 PM by bogardj with | with 28 comment(s) Filed under: Domain-Driven Design

• Domain-Driven Design: Supple Design Patterns Series

  At last week's Austin DDD Book Club , we discussed my favorite chapter in Evans' Domain-Driven Design book : Supple Design. Modeling is an important exercise in Domain-Driven Design, but it's not enough to have a codebase that's easy to... Posted May 15 2008, 07:37 AM by bogardj with | with 6 comment(s) Filed under: Domain-Driven Design

• Enhancing mappers with LINQ

  The "big 3" higher-order functions in functional programming are Filter, Map and Reduce. When looking at the new C# 3.0 LINQ query operators, we find that all three have equivalents : Filter = Where Map = Select Reduce = Aggregate Whenever you... Posted May 08 2008, 07:49 AM by bogardj with | with 12 comment(s) Filed under: Domain-Driven Design, C#, LINQ

• Guidelines aren't rules

  I'm a huge fan of the Framework Design Guidelines book. It provides great instruction on creating reusable libraries, based on Microsoft's design on the .NET Framework. But it's important to remember that guidelines aren't rules . Guidelines... Posted Apr 15 2008, 07:24 AM by bogardj with | with 5 comment(s) Filed under: Domain-Driven Design, ASP.NET MVC

• Mapping options in LINQ to SQL

  A recent thread on the ALT.NET message board asked: How does everyone create the DataContext for their DB? Do you use the IDE and generate your custom .dbml (which also generates all your DTO's)? Do you use a generic DataContext object and just .GetTable<>... Posted Mar 18 2008, 10:15 PM by bogardj with | with 5 comment(s) Filed under: Domain-Driven Design, LINQ to SQL

• Moving past stored procedures

  On Chad's recent SQL-assembly comparison post , a few interesting comments caught my eye proclaiming the glory of stored procedures. From tom (no link): [Stored procedures] are not only useful for speed but also for ACID and to keep business logic... Posted Feb 22 2008, 08:15 AM by bogardj with | with 10 comment(s) Filed under: Domain-Driven Design, Rant

• Customer-facing identifiers

  I'm still installing miscellaneous drivers for my work laptop (Dell Inspiron 1501). I just downloaded an additional printer driver for an office printer, but can anyone tell me in less than 5 seconds, without Googling, which file is the printer driver... Posted Jan 17 2008, 10:48 AM by bogardj with | with 1 comment(s) Filed under: Domain-Driven Design

• Intention-concealing interfaces: blob parameters

  When someone is using your code, you want your code to be as explicit and easy to understand as possible. This is achieved through Intention-Revealing Interfaces. Evans describes the problems of opaque and misleading interfaces in Domain-Driven Design... Posted Nov 29 2007, 10:27 AM by bogardj with | with 1 comment(s) Filed under: Domain-Driven Design, Patterns, C#