The above abstraction (interface) can be used in our UserLogic such that: public class UserLogic Public class OutlookEmailService: IEmailService public class GoogleEmailService: IEmailService The corresponding implementation can then inherit from the interface. Void SendMail( string emailAddress, string message) It sends an email which can help us provide an abstraction of the email service, which is going to be used even when we do not know which exact service (Google or Outlook) is to be used. Public void SendMail( string emailAddress, string message)įrom the examples shown, we can observe that there is a generic function that all email services will provide. _emailService = new OutlookEmailService() Private OutlookEmailService _emailService Looking at the services used in this register action of the account controller, we can observe that changing the service would imply changing a lot of the codebase, especially if the service has been used in multiple parts of the project.įor instance, if the email service is replaced with a new one as shown below, we can see that the tightly coupled email service would need to be changed everywhere is it used in the project. Public SendMail( string emailAddress, string message) Public GoogleOAuthResult RegisterUser( string emailAddress, string password) _emailService.SendMail(emailAddress, authResult.ConfirmationMessage) Var authResult = _authService.RegisterUser(emailAddress,password) Public void Register( string emailAddress, string password) _emailService = new GoogleEmailService() Private GoogleEmailService _emailService Rather than directly instantiating dependencies, or using static references, the objects a class needs in order to perform its actions are provided to the class in some abstracted form.Īn example of the traditional way: public class UserLogic
The provided object will satisfy the dependency during program execution but would not be known at compile time. In dependency injection, a dependent object or service is provided with the object it needs at run time.
#Outlook private var mobile containers code
In IoC, the code could also be linked statically during compilation to the defined interface functions, but finding the implementation of the function to execute by reading its description from external configuration instead of with a direct reference in the code itself. This principle can be achieved by techniques like dependency injection. With the inversion of control, the flow depends on the defined abstractions to be implemented that is built up during program execution. Normally, the flow of the program logic is determined by objects that are bound to one another. To further explain the dependency injection design pattern, the inversion of control principle has to be broken down. This is also why DI is an implementation of the Inversion of control (IoC) principle. The dependencies are injected from the code that calls the class and any information about their creation are kept away from the inside of the class. The purpose of DI is to make code maintainable and easy to update.ĭI is a technique to create a dependency or dependencies outside the class that uses it.
#Outlook private var mobile containers software
DI helps in getting rid of tightly coupled software components. Dependency Injection (DI) is an object-oriented programming design pattern that allows us to develop loosely coupled code.
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