What is Dependency Injection?
Imagine you have a car, and it needs an engine to run. Instead of the car building its own engine, you give (inject) the engine to the car from the outside. This way, the car doesn’t care how the engine is made, just that it works.
In programming terms,
- A class (like your car) needs another class (like the engine) to do its work.
- Instead of the class creating the dependency (engine) itself, you inject it from the outside.
This is called Dependency Injection.
There are 3 Types of DI.
- Constructor Injection
- Property Injection
- Method Injection
Real-World Scenario: Notification System
Step 1. Define Interfaces.
Step 2. Implement the Interfaces.
Step 3. Create the Service Class (Uses All 3 DI Types).
Step 4. Use the Service in a Real-World Scenario (such as in a Console or ASP.NET application).
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