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    <p>I'm with you, Vadim. IoC containers take a simple, elegant, and useful concept, and make it something you have to study for two days with a 200-page manual.</p> <p>I personally am perplexed at how the IoC community took a beautiful, <a href="http://www.martinfowler.com/articles/injection.html" rel="noreferrer">elegant article by Martin Fowler</a> and turned it into a bunch of complex frameworks typically with 200-300 page manuals.</p> <p>I try not to be judgemental (HAHA!), but I think that people who use IoC containers are (A) very smart and (B) lacking in empathy for people who aren't as smart as they are. Everything makes perfect sense to them, so they have trouble understanding that many ordinary programmers will find the concepts confusing. It's the <a href="http://www.nytimes.com/2007/12/30/business/30know.html" rel="noreferrer">curse of knowledge</a>. The people who understand IoC containers have trouble believing that there are people who don't understand it.</p> <p>The most valuable benefit of using an IoC container is that you can have a configuration switch in one place which lets you change between, say, test mode and production mode. For example, suppose you have two versions of your database access classes... one version which logged aggressively and did a lot of validation, which you used during development, and another version without logging or validation that was screamingly fast for production. It is nice to be able to switch between them in one place. On the other hand, this is a fairly trivial problem easily handled in a simpler way without the complexity of IoC containers.</p> <p>I believe that if you use IoC containers, your code becomes, frankly, a lot harder to read. The number of places you have to look at to figure out what the code is trying to do goes up by at least one. And somewhere in heaven an angel cries out.</p>
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    1. POWhy do I need an IoC container as opposed to straightforward DI code?
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    1. USJoel Spolsky
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    1. COIf I may say, it looks like different view of the world for different people. People who use IOC are like ideologists wanting the world to follow their footsteps & then there are other like me (and other developers) who are stuck between ideology & reality ;)
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      1. USshahkalpesh
    2. COCouldn't agree more. Started looking into using a DI framework (StructureMap) which claims to be the oldest IoC container. The complexity was staggering considering what I wanted. Instead I am writing my own very simple Service Locator. Perhaps one of the other IoC containers would have made more sense but I really don't see the point nor do I have the leisure of spending several days figuring out how to use something that will make reading the code more complex.
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    3. COMartin Fowler, while a great author, didn't in any way invent IoC.
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      1. USNicholas Blumhardt
 

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