Dependency Injection

in .NETRemigiusz Koczapski

http://blog.koczapski.com

Java and Spring Container

Dependency injection

• Dependency Injection

• Poor Man's DI

• Inversion of Control

Props of DI

• Loose coupling

• Setup problem solving

• Lifetime management

• Interception and cross-cutting concerns

Dependencies

• What to inject

• Seams

• Volatile and Stable Dependencies

• Where to inject

• Composition Root

• How to inject

• Register Resolve Release (3-call Pattern)

DI Container Configuration

Code: ManualXML

Code: Auto-wiring

DI Patterns

Method InjectionConstructor Injection

Property Injection Ambient Context

DI Patterns - which to choose

© Mark Seeman – Dependency Injection in .NET

DI Anti-Patterns

Bastard InjectionControl Freak

Constrained Construction Service Locator

DI in ASP.NET MVC

• Custom Controller Factory – Ideal composition root

• Dependency Resolver - Service Locator Anti-Pattern

(with no Release method)

Lifetime Management

• Transient

• Singleton

• Thread

• Request

Interception

• Surrounding invoked method

• Cross-cutting Concerns

• Decorator Pattern

• SRP & OCP

• Aspect Oriented Programming

• Dynamic Interception

© Mark Seeman – Dependency Injection in .NET

DI Containers

• Castle Windsor

• Sprint.NET

• StructureMap

• Autofac

• Ninject

• Mef

• Unity

• Differences

• Registration order

• Lifetime Management names and

options

• Configuration support

• Implementation Binding

• Sequence Binding

• Named Instances