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Why do I need an IoC container as opposed to straightforward DI code? [closed] 30 answers What is dependency injection? 31 answers
Bacause it is a good practice. Code is much clearer and easier to maintenance. For example i'm using it in controllers constructors (i pass repositories and services as arguments) and in repositories (i pass dbcontext as argument) - but it depends on your project's architecture. StructureMap is one of the Ioc containers (i personally prefer NInject or Funq) so without it you miss all advantages of using IoC.
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