How can objects be injected in run time (after the initialization)?

Seems you need a standard factory/abstract factory pattern, where you pass in compile time dependencies in the constructor and runtime dependencies in the creation methods.

I didn't really understood your question. But it seems you are looking for Service Locator pattern. Most IoC frameworks have some kind of static object, that allows you to create dependencies on-the-fly instead of injecting them into constructors or properties.

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