Lars-Erik Kindblad Senior Consultant Blog: kindblad.com Inversion of Control – Introduction & Best Practice
Inversion of Control - Introduction and Best Practice
May 26, 2015
This presentation goes through what Inversion of Control is, which IOC patterns that exists, which of the patterns you should use and when you should use them.
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Lars-Erik KindbladSenior ConsultantBlog: kindblad.com
Inversion of Control – Introduction & Best Practice
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Agenda
Introduction• Inversion of Control• Dependency Injection Patterns• Service Locator Patterns• Inversion of Control Containers
Best Practice• What patterns to use• When to use the patterns
Summary
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Inversion of Control
Inversion of Control = IOC Make code loosely coupled Allows for more reuse Make unit testing possible How? Move creation of dependencies outside the class they are
being used in A better name - Inversion of Dependency Creation
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Traditional Code
Inversion of Control
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Traditional Code
Inversion of Control Code
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Traditional Code
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Dependency Injection - Constructor Injection
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Dependency Injection - Interface Injection
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Dependency Injection - Setter Injection
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Static Service Locator
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Injected Service Locator
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Inversion of Control Container
A framework that can automatically create a given type with all the required dependencies
Popular frameworks• Unity• Castle Windsor• Ninject• StructureMap• etc.
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Inversion of Control Container
Manual approach
Using an IOC Container
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Which patterns to use
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Traditional Code
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Traditional Code
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Dependency Injection - Constructor Injection
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Dependency Injection - Constructor Injection
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Dependency Injection - Interface Injection
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Dependency Injection - Interface Injection
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Dependency Injection - Setter Injection
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Dependency Injection - Setter Injection
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Static Service Locator
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Static Service Locator
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Injected Service Locator
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Injected Service Locator
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When to use which patterns
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Always use Dependency Injection – Constructor Injection
...except
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FACADE CLASSES
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Facade Classes
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Dependency Injection
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Dependency Injection
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Service Locator
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Service Locator
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LOOPS
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Loops
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Dependency Injection
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Dependency Injection
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Service Locator
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Service Locator
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Dependency Injection using Func<>
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Dependency Injection using Func<>
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BASE CLASSES
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Base Classes
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Dependency Injection
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Dependency Injection
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Service Locator
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Service Locator
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UNKNOWN TYPES AT COMPILE TIME
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Unknown types at compile time
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Unknown types at compile time
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Service Locator
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Service Locator
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Summary
Constructor Injection Injected Service Locator
Facade classes(WCF Services,MVC Controllers)
X
Loops X (Func<>) X
Base classes X
Unknown types at compile time
X
All other scenarios X
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QUESTIONS?
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