By Mark Seemann
Precis Dependency Injection in .NET provides center DI styles in simple C#, so you will totally know how DI works, covers integration with ordinary Microsoft applied sciences like ASP.NET MVC, and teaches you to exploit DI frameworks like constitution Map, fortress Windsor, and harmony. in regards to the TechnologyDependency Injection is a brilliant method to decrease tight coupling among software program parts. rather than hard-coding dependencies, comparable to specifying a database motive force, you inject a listing of providers part might have. The providers are then hooked up by way of a 3rd celebration. this system allows you to greater deal with destiny adjustments and different complexity on your software program. approximately this BookDependency Injection in .NET introduces DI and offers a pragmatic consultant for utilising it in .NET purposes. The ebook provides the center styles in undeniable C#, so you are going to totally know how DI works. Then you will discover ways to combine DI with common Microsoft applied sciences like ASP.NET MVC, and to take advantage of DI frameworks like StructureMap, fortress Windsor, and cohesion. by means of the tip of the ebook, you can be cozy employing this robust method on your daily .NET development.This ebook is written for C# builders. No past adventure with DI or DI frameworks is needed. what is InsideMany C#-based examples A catalog of DI styles and anti-patterns utilizing either Microsoft and open resource DI frameworksTabel of ContentsPART 1 placing DEPENDENCY INJECTION at the MAP A Dependency Injection tasting menu A complete instance DI packing containers half 2 DI CATALOG DI styles DI anti-patterns DI refactorings half three DIY DI item Composition item Lifetime Interception half four DI boxes fort Windsor StructureMap Spring.NET Autofac harmony MEF
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Additional info for Dependency Injection in .NET
With clearly defined responsibilities, you’ll often have a good idea of where to start looking for the root cause of a problem. TESTABILITY For some, TESTABILITY is the least of their worries; for others, it’s an absolute requirement. Personally, I belong in the latter category: in my career, I’ve declined several job offers because they involved working with certain products that aren’t TESTABLE. DEFINITION An application is considered TESTABLE when it can be unit tested. The benefit of TESTABILITY is perhaps the most controversial of the benefits I’ve listed.
When it’s done, the DEPENDENCIES go out of scope. If no other classes reference them, they’re eligible for garbage collection. What if two consumers share the same type of DEPENDENCY? 15 shows that we may alternatively sharing the same type of DEPENDENCY is injected with its own choose to share a single instance across several con- private instance. sumers. However, from the perspective of the consumer, there’s no difference. According to the LISKOV SUBSTITUTION PRINCIPLE, the consumer must treat all instances of a given interface equally.
The ability to test modules in isolation is very important in unit testing. It’s only when an application is susceptible to unit testing that it’s considered TESTABLE. The safest way to ensure TESTABILITY is to develop it using Test-Driven Development (TDD). It should be noted that unit tests alone don’t ensure a working application. Full system tests or other in-between types of tests are still necessary to validate whether an application works as intended. Depending on the type of application I’m developing, I may or may not care about the ability to do late binding, but I always care about TESTABILITY.