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uid Article.Unity.Design

Design of Unity

Unity was designed to achieve the following goals:

  • Promote the principles of modular design through aggressive decoupling.
  • Maximize testability when designing applications.
  • Provide a fast and lightweight dependency injection platform for creating new as well as managing existing objects.
  • Expose a compact and intuitive API for developers to work with.
  • Support a wide range of languages, and platforms.
  • Allow attribute-driven injection for constructors, properties, fields, and methods.
  • Provide extensibility through container extensions.
  • Provide stability required in enterprise-level line of business (LOB) applications.

To allow maximum flexibility Unity container split into core and extension packages. Core packages implement basic IoC/DI functionality and extensions provide specific behavior such as configuration, decoration, and etc.

Unity Core

Unity core consists of two assemblies:

  • Unity.Abstractions
  • Unity.Container

Unity.Abstractions assembly contains all public declarations required to use the container in applications and relatively unchanged from version to version. It defines IUnityContainer interface as well as types and interfaces used to register, configure and resolve types and instances.

Unity.Container assembly implements the IoC engine and exposes public members required to extend the container.

Core Packages

For legacy support and general convenience core library is distributed in two different forms:

Composite package Unity

This is a convenience package containing both Unity.Abstractions as well as Unity.Container assemblies. This package is distributed to support legacy applications.

Independent Packages Unity.Abstractions and Unity.Container

To allow easier path to upgrade and maximum decoupling between declarative part and implementation, Unity split into two assemblies: Unity.Abstractions and Unity.Container

When used in libraries it allows linking to Unity.Abstractions and referencing Unity.Container only in bootstrapping project.

Unity Extensions

Unity project implements and distributes several extensions such as Unity.Configuration, Unity.Interception, and etc.

More Information

For more information about using packages inside applications see Application Design concepts with Unity.