Explain Dependency Injection principles and patterns for .NET applications.
npx skills add https://github.com/Objective-Arts/lens --skill dotnet-di
Please help me install this Agent Skill. Skill: dotnet-di Source: https://github.com/Objective-Arts/lens/tree/main/canon/csharp/dotnet-di Command: npx skills add https://github.com/Objective-Arts/lens --skill dotnet-di
This Skill helps developers understand and implement robust Dependency Injection (DI) patterns in .NET, leading to more testable, maintainable, and loosely coupled code.
Review the core principles of constructor injection and service lifetimes for .NET applications.
High-intent search queries and answers about installing and using this skill.
To configure dependency injection in ASP.NET Core, use constructor injection at the Composition Root to wire services, ensuring loosely coupled C# code that is highly testable and maintainable. This approach simplifies mocking during unit testing.
Common dependency injection anti-patterns in .NET include the Service Locator pattern and Captive Dependencies. Fix them by applying constructor injection and correctly matching service lifetimes to prevent captive dependency issues.
Service lifetimes in .NET dependency injection define how long a service instance persists. Selecting the correct lifetime prevents Captive Dependencies and ensures resources are managed effectively throughout your application's execution scope.
The Composition Root in .NET application design is the single location where object graphs are wired together. It applies dependency injection principles near the application's entry point to centralize configuration and maintain loose coupling.
Unit testing fails with complex object wiring in C# when dependencies are tightly coupled. Refactoring to use constructor injection and dependency injection design patterns allows effective mocking and yields easily testable code.
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