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Converters and IoC containers

Now, using an IoC container is a have to for any kind of project. Even in small and simple project, people started to use an IoC. It is very hard for me to understand why you would use an IoC for any kind of project, because you will raise the complexity without needing it. Also people add to IoC all the objects, they don’t ask themselves if they really need that object in IoC.
What do you think about converters added to the IoC?
Very often people add all the converters to the IoC. Even if there are converters used in only one class. In a big project we can end up with hundreds of converters in the IoC container. Theoretically you could have the case when you need to replace a converter with another one, but how often this will be needed. Also, if you have converters that are used in only one place, changing the converter will required to change the class also (maybe).
I would not add any kind of converters to the IoC. The only type of converters that I would add to the IoC are the one that are used on different components and there is a big chance to be changed. To tell you the true, until now I didn’t had the opportunity to meet that kind of converter : ) .
For example a converter that converts an entity that is received through the wire, will need to be changed if the entity that is received is changed. But in the same time, there are big chances to need to change also your component. Because of this I would not add this converter to the IoC.
In conclusion we could say that in general a converter doesn’t need to be added to IoC. The cases when we really need a converter in the IoC container are rare and isolated.


  1. The main reason is consistency - if in a project someone decides to inject the dependencies automatically using a DI container, it is easier to inject all dependencies in this way, than to stop in each case to weight if it would be enough to inject it manually or create it directly.

    The more general question is where we should apply IoC - some say that it should be applied only at layer boundaries, other at component (not class) boundaries etc.. - if such a general rule is adopted, it's easier to decide..

    Other rule would be: if two classes should not be tested in isolation, maybe there is no point in using a DI framework between the two.


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