.Net Core | Dependency Injection (DI/Ioc)

Dependency Injection(DI) & Inversion of Control(Ioc)

• ConfigureServices is the method used to register Types/ Services in Ioc container.
• Classes of application (even view using Razor) can call these services whenever required.
• If a class uses any Ioc registered service instance, its required to implement interface of that service in the class.
• Lifetime of registered service instances is managed by runtime(framework). Because you already mention the same while registering a service.

Ex.

public void ConfigureServices(IServiceCollection services)  

{  

        services.AddSingleton<IEmailSender, EmailSender>();

        services.AddMvc();  

} 

services.AddSingleton<InterfaceName, className>();

services.AddScoped<InterfaceName, className>();

services.AddTransient<InterfaceName, className>();

Benefits: 

• Required services instance can be used throughout the application.
• No need to create and dispose services instances when calling them.
• Lifetime of services instances managed by Ioc container, that is called by runtime.