[. NET Core] simple use of built-in Mvc IOC and mvcioc

[. NET Core] simple use of built-in Mvc IOC and mvcioc

 

This article is based on. NET Core 2.0.

In view of the many theories of online articles, I want to organize a Hello World (Demo) article.

Because the built-in Ioc of Mvc is used, you do not need to use Nuget to install other class libraries for reference.

 

Scenario 1: use of simple classes

Class DemoService. cs:

    public class DemoService    {        public string Test()        {            return Guid.NewGuid().ToString();        }    }

 

Controller DemoController. cs:

    public class DemoController : Controller    {        private readonly DemoService _demoService;        public DemoController(DemoService demoService)        {            _demoService = demoService;        }        public IActionResult Index()        {            return Json(_demoService.Test());        }    }

 

You must register the ConfigureServices () method in Startup. cs before using it. Three methods are provided here. You can register the ConfigureServices () method as you like.

// Method 1 services. addSingleton (typeof (DemoService), new DemoService (); // method 2 services. addSingleton (typeof (DemoService); // method 3 services. addSingleton <DemoService> ();

 

 

The output result is normal:

// Example services. AddTransient (typeof (DemoService ));
Services. AddScoped <DemoService> ();

 

Scenario 2: Use of interface classes

Interface IDemo2Service. cs:

    public interface IDemo2Service    {        string Test();    }

 

Demo2Service. cs:

    public class Demo2Service : IDemo2Service    {        public string Test()        {            return Guid.NewGuid().ToString();        }    }

 

Controller Demo2Controller. cs:

    public class Demo2Controller : Controller    {        private readonly IDemo2Service _demoService;        public Demo2Controller(IDemo2Service demoService)        {            _demoService = demoService;        }        public IActionResult Index()        {            return Json(_demoService.Test());        }    }

 

The registration method added to the ConfigureServices () method in Startup. cs is as follows:

// Method 1 services. addSingleton (typeof (IDemo2Service), new Demo2Service (); // method 2 services. addSingleton (typeof (IDemo2Service), typeof (Demo2Service); // method 3 services. addSingleton <IDemo2Service, Demo2Service> ();

 

 

The output result is normal:

 

Scenario 3: Use of referenced Class Libraries