What is Constructor Selection logic in DI Containers?

If a class has multiple constructors, the DI container must mathematically determine which one to use during instantiation.

Most robust containers look for the constructor with the most parameters that can be fully satisfied by the currently registered services. If multiple ambiguous constructors exist (e.g., two constructors with 2 parameters that can both be satisfied), the container will throw a runtime exception. Some frameworks allow a specific attribute (@Inject or [ActivatorUtilitiesConstructor]) to force selection.