Dependency Injection for ASP NET Core 6.0 – An UPDATED 2022 Tutorial

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ASP.NET Core supports the dependency injection (DI) software design pattern, which is a technique for achieving Inversion of Control (IoC) between classes and their dependencies.

For more information specific to dependency injection within MVC controllers, see Dependency injection into controllers in ASP.NET Core.

For information on using dependency injection in applications other than web apps, see Dependency injection in .NET.

For more information on dependency injection of options, see Options pattern in ASP.NET Core.

This topic provides information on dependency injection in ASP.NET Core. The primary documentation on using dependency injection is contained in Dependency injection in .NET.

View or download sample code (how to download)

Overview of dependency injection
A dependency is an object that another object depends on. Examine the following MyDependency class with a WriteMessage method that other classes depend on.

A class can create an instance of the MyDependency class to make use of its WriteMessage method. In the following example, the MyDependency class is a dependency of the IndexModel class.

The class creates and directly depends on the MyDependency class. Code dependencies, such as in the previous example, are problematic and should be avoided for the following reasons:

· To replace MyDependency with a different implementation, the IndexModel class must be modified.
· If MyDependency has dependencies, they must also be configured by the IndexModel class. In a large project with multiple classes depending on MyDependency, the configuration code becomes scattered across the app.
· This implementation is difficult to unit test.

Dependency injection addresses these problems through:

· The use of an interface or base class to abstract the dependency implementation.
· Registration of the dependency in a service container. ASP.NET Core provides a built-in service container, IServiceProvider. Services are typically registered in the app’s Program.cs file.
· Injection of the service into the constructor of the class where it’s used. The framework takes on the responsibility of creating an instance of the dependency and disposing of it when it’s no longer needed.

Interested in this? Watch the video to find out more about ASP NET Dependency Injection!

#asp #dotnet #DependencyInjection #code #programming #csharp

TIMESTAMPS
00:00 Dependency Injection in .NET? Yes please!
00:24 Why dependency Injection?
01:00 Creating a Service
02:32 Register our Service
04:52 Using our Service
07:20 Summary on how to get the DI going
07:58 Thanks for watching!

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