using System;

using System.Threading;

using Microsoft.Extensions.DependencyInjection;

​

namespace TestConsole

{

    public interface IHealth

    {

        public bool Healthy { get; set; }

    }

​

    public class Health : IHealth

    {

        public bool Healthy { get; set; }

    }

​

    public class MyClass

    {

        private readonly IHealth _health;

​

        public MyClass(IHealth health)

        {

            _health = health;

        }

​

        public void SetHealthy()

        {

            Console.WriteLine("Set Healthy true");

            _health.Healthy = true;

        }

    }

​

    public class CheckHealth

    {

        private readonly IHealth _health;

​

        public CheckHealth(IHealth health)

        {

            _health = health;

        }

​

        public void PrintHealth(

            CancellationToken cancellationToken = default)

        {

            if (_health.Healthy)

            {

                Console.WriteLine("Healthy");

            }

            else

            {

                Console.WriteLine("Unhealthy");

            }

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            var serviceCollection = new ServiceCollection();

​

            serviceCollection.AddSingleton<IHealth, Health>();

            serviceCollection.AddSingleton<MyClass>();

            serviceCollection.AddSingleton<CheckHealth>();

​

            var serviceProvider = serviceCollection.BuildServiceProvider();

​

            var myClass = serviceProvider.GetRequiredService<MyClass>();

            myClass.SetHealthy();

​

            var checkHealth = serviceProvider.GetRequiredService<CheckHealth>();

​

            checkHealth.PrintHealth();

        }

    }

}

​