C# 依赖注入

一、依赖注入定义：

只依赖于服务类的一个接口，而不依赖于具体服务类。

二，依赖注入的类别
1.构造注入

2.Setter注入

示例：

using System;
using System.Collections.Generic;
using System.Linq;
namespace SetterInjection
{
    class Program
    {
        static void Main(string[] args)
        {
            Dependency service = new Dependency(new ServiceA());
            service.Start();

            service = new Dependency(new ServiceB());
            service.Start();
        }
    }
    interface IService
    {
        void ServiceMethod();
    }
    class ServiceA : IService
    {
        public void ServiceMethod()
        {
            Console.WriteLine("Method is service A");
        }
    }
    class ServiceB : IService
    {
        public void ServiceMethod()
        {
            Console.Write("Method is service B");
        }
    }
    class Dependency
    {
        IService service = null;
        public Dependency() { }
        //构造注入
        public Dependency(IService _service)
        {
            this.service = _service;
        }
        //Setter注入
        public void Setter(IService _service)
        {
            this.service = _service;
        }
        public void Start()
        {
            this.service.ServiceMethod();
        }
    }
}