Dependency Injection Principles, Practices, and Patterns

Summary

Dependency Injection Principles, Practices, and Patterns teaches you to use DI to reduce hard-coded dependencies between application components. You'll start by learning what DI is and what types of applications will benefit from it. Then, you'll work through concrete scenarios using C# and the .NET framework to implement DI in your own projects. As you dive into the thoroughly-explained examples, you'll develop a foundation you can apply to any of the many DI libraries for .NET and .NET Core.

About the Technology

Dependency Injection (DI) is a great way to reduce tight coupling between software components. Instead of hard-coding dependencies, such as specifying a database driver, you make those connections through a third party. Central to application frameworks like ASP.NET Core, DI enables you to better manage changes and other complexity in your software.

About the Book

Dependency Injection Principles, Practices, and Patterns is a revised and expanded edition of the bestselling classic Dependency Injection in .NET. It teaches you DI from the ground up, featuring relevant examples, patterns, and anti-patterns for creating loosely coupled, well-structured applications. The well-annotated code and diagrams use C# examples to illustrate principles that work flawlessly with modern object-oriented languages and DI libraries.

What's Inside

Refactoring existing code into loosely coupled code
DI techniques that work with statically typed OO languages
Integration with common .NET frameworks
Updated examples illustrating DI in .NET Core

About the Reader

For intermediate OO developers.

About the Authors

Mark Seemann is a programmer, software architect, and speaker who has been working with software since 1995, including six years with Microsoft. Steven van Deursen is a seasoned .NET developer and architect, and the author and maintainer of the Simple Injector DI library.

Table of Contents

PART 1 Putting Dependency Injection on the map
The basics of Dependency Injection: What, why, and how
Writing tightly coupled code
Writing loosely coupled code
PART 2 Catalog
DI patterns
DI anti-patterns
Code smells
PART 3 Pure DI
Application composition
Object lifetime
Interception
Aspect-Oriented Programming by design
Tool-based Aspect-Oriented Programming
PART 4 DI Containers
DI Container introduction
The Autofac DI Container
The Simple Injector DI Container
The Microsoft.Extensions.DependencyInjection DI Container