SharePoint Patterns & Practices

IoC, DI, Service LocatorHa Doan

Agenda

1. Inversion of Control (IoC) 2. Dependency Injection (DI)3. Service Locator4. Discussion5. Demo6. Service Locator in Sharepont 20107. Service Locator in Domea

• The main control of the program was inverted, moved away from you to the framework.

• In Console app:print "enter your name"read nameprint "enter your address"read addressetc...store in database

Inversion of Control (IoC)

• GUI Appwhen the user types in field a, store it in NAMEwhen the user types in field b, store it in ADDRESSwhen the user clicks the save button, call StoreInDatabase

=> Control is inverted

IoC

IoC

IoC

IoC

DI

• DI is a subtype of IOC and is implemented by constructor injection, setter injection or method injection

Service Locator

The service locator pattern is a design pattern used in software development to encapsulate the processes involved in obtaining a service with a strong abstraction layer

DEMO

1. Setup IoC Container2. Register services (components)3. Using components

Discusstion: Why DI & Service Locator????

• Namespace: Microsoft.Practices.SharePoint.Common.dll

• Get service locator:IServiceLocator serviceLocator = SharePointServiceLocator.GetCurrent();

• Add service:var typeMappings = serviceLocator.GetInstance<IServiceLocatorConfig>();typeMappings.RegisterTypeMapping<IService1, Service1>();

• Get serviceIService1 service1 = serviceLocator.GetInstance<IService1>();

Sharepoint Service Locator

Questions

Thank you!