Use for tightly coupled to Loosely Coupled.
DI implantation using “Inversion Of Control (IoC)” .
What Is Inversion Of Control (IoC) ?
- Object do not create other object which they rely to do their work but they get the object from outside source.
For Example:
Without Inversion of Control.
public class TextEditor {
private SpellChecker checker;
public TextEditor() {
this.checker = new SpellChecker();
}
}
- What we’ve done here creates a dependency between the TextEditor and the SpellChecker.
With Inversion of Control.
- In Inversion of Control scenario we would instead do something like this
public class TextEditor {
private IocSpellChecker checker;
public TextEditor(IocSpellChecker checker) {
this.checker = checker;
}
}
- You have inverted control by handing the responsibility of instantiating the spell checker from the TextEditor class to the caller.
- In MVC, There is no Inbuilt feature for Dependency Injection. So we have to achieve through different container like Unity, Ninject and Autofac etc.
- (Note: In .Net core there is Inbuilt feature for dependency Injection so no need to add any container.)
- In this tutorial, we are using Unity Container for achieve Dependency Injection.
Step 1: Add a new Asp.Net Mvc Project.
Step 2: Now, Install “Unity.Mvc5” Container using Nuget package Manager.
- After install successfully, two file references added to our project and a UnityConfig.cs class file in App-Start file.
Step 3
- Add Interface IEmployeeRepository inside interface folder.
- Now Add Repository Which have Data access Code which inherit to Interface as per below SS.
Step 4: Now register the repository inside UnityConfig.cs file.
Step 5: Now inject the dependency in Controller.
Step 6: Add View for the same.
Finally, run the project,
- In Future, we need to change the repository that time simply change the repository in UnityConfig.cs File like below
- The main purpose is to no need to change in every controller, just simply change on container that’s means totally loosely coupled.
- After Run the Project,
