Depencency injection question

Question

I have a question regarding dependency injection pattern. My question is... If I go for constructor injection, injecting the dependencies for my class, what I get is a "big" constructor with many params. What if ie. I dont use some of the params in some methods? Ie. I have a service that exposes many methods. And a constructor with 10 parameters (all dependencies). But not all the methods uses all the dependencies. Some method will use only one dependency, another will use 3 dependencies. But DI container will resolve them all even if non are used.

To me this is a performance penalty of using DI container. Is this true?

Answer 1

It seems your class is doing to much, that it does not comply to the S in SOLID (Single responsibility principle) , maybe you could split the class in multiple smaller classes with less dependencies. The fact that not all dependencies are used by all methods suggests this.