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Archives / 2008 / April

  • Why can't I be satisfied when I'm looking back on old applications?

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    Most of the time I build an application I  have the feeling "this is going to be a great app. Good design, nice written code and a perfect application". I think most of you had the same feeling sometimes. But when I look back on previous applications, I say "What!? NO!!! This is not good, well this could have been done much better ... omg! What have I done! .. what a bad method name....". I don't know why I often feel like that when looking back on my previous apps. When I'm looking back on my code, I always find something I could have done better. Why can't I just write the perfect app, so I can go back later and say to my self "Well Fredrik, this one is great, good work!".

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  • Can the use of Extension methods break the Law of Demeter?

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    To make an easy description of Law of Demeter we can summarize it to the following sentence:

    “In particular, an object should avoid invoking methods of a member object returned by another method.”

    What does this has to do with Extension methods? It depends on how it’s used. For example we have several Extension Methods for the IEnumerable interface, like Where and OrderBy. By using those methods we can easy select data out from lists, for example (I’m so worthless when it comes to give methods good name, and the following method is so stupid, but it’s only an example.):

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  • ASP.Net MVC Framework - How do I design my apps with the MVC pattern and +P

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    When I'm playing around with the ASP.NET MVC Framework I have created several prototype applications with different solutions to solve some "problems." In this post I will write down how I combine a Presentation Model (When I talk about Presentation Model in this post, I refer to a model which purpose is only to define a model for presentation purpose) with the MVC, it's what the P in MVC+P stands for. 

    When I build apps today I use Domain Driven Design and I use the MVC pattern in some of my web based applications. As many of you know the M in MVC stands for the Model and contains our entities, business logic can data access components. Often when I build my apps with the ASP.Net MVC Framework (still only use in as a prototype because the framework is under development) I create my own custom Controller Factory to support Dependency Injection (DI). For example I use constructor injection or setter injection to inject my Repositories or manual injection of Mock objects during test. I use Spring.Net as my DI framework because it’s the framework I like the most.

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