C#依赖注入

参考博客园文档：

https://www.cnblogs.com/sunpan/p/14244062.html

nuget 安装依赖包(nuget 使用源路径：https://www.nuget.org/api/v2/)

 

 

 

 按照参考文件直接编写程序如下：

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.Extensions.DependencyInjection;

namespace TestDI
{
    //定义接口
    public interface IFoobar 
    {
        void Show();
    }
    class Foo : IFoobar
    {
        public void Show()
        {
            Console.WriteLine("Foo Show func...");
        }
    }
    class Bar : IFoobar
    { 
        public void Show()
        {
            Console.WriteLine("Bar Show func...");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var scol = new ServiceCollection()
                .AddSingleton<IFoobar, Foo>()
                .AddSingleton<IFoobar, Bar>();
            
            IServiceProvider service_pro = scol.BuildServiceProvider();
            Console.WriteLine("serviceProvider.getservice():{0}", service_pro.GetService<IFoobar>());

            IEnumerable<IFoobar> services = service_pro.GetServices<IFoobar>();
            Console.WriteLine("serviceProvider.getservices():");
            foreach (var fb in services)
            {
                fb.Show();
                Console.WriteLine("{0}",fb);
            }

            Console.ReadKey();
        }
    }
}