How can I use dependency injection in asp.net mvc?

Question

As title said, I want to use dependency injection in MVC5 like asp.net core. But MVC5 doesn't have start up and those service configuration. How can I do that?

Answer 1

Hi @丁丁大魔王 ,

You can use Microsoft extensions .NET core DI to achieve Dependency Injection. using Microsoft.Extensions.DependencyInjection.

Use a configuration class like asp.net core:

public void Configuration(IAppBuilder app)  
{  
    // We will use Dependency Injection for all controllers and other classes, so we'll need a service collection  
    var services = new ServiceCollection();  
  
    // configure all of the services required for DI  
    ConfigureServices(services);  
  
    // Configure authentication  
    ConfigureAuth(app);  
  
    // Create a new resolver from our own default implementation  
    var resolver = new DefaultDependencyResolver(services.BuildServiceProvider());  
  
    // Set the application resolver to our default resolver. This comes from "System.Web.Mvc"  
    //Other services may be added elsewhere through time  
    DependencyResolver.SetResolver(resolver);  
}  

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Best regards,
Bruce Zhang