Having trouble understanding ninject (or just IOC container in general) over factory DI?

The benefit of IoC containers grows with the size of the project. For small projects their benefit compared to "Poor Man's DI" like your factory is minimal. Imagine a large project which has thousands of classes and some services are used in many classes.

In this case you only have to say once how these services are resolved. In a factory you have to do it again and again for every class.

To be fully analagous your factory code should read.

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