1.IOC简介

IOC(Inversion of Control)，控制反转

DI (Dependency Injection)，依赖注入

IOC的基本概念是：不创建对象，但是描述创建它们的方式。在代码中不直接与对象和服务连接，但在配置文件中描述哪一个组件需要哪一项服务。容器负责将这些联系在一起。

2.Unity引入

3.创建单例模式容器类

using Microsoft.Practices.Unity;using Microsoft.Practices.Unity.Configuration;using System;using System.Collections.Generic;using System.Configuration;using System.Linq;using System.Text;using System.Threading.Tasks;namespace UnityIocTest{    ///     /// Unity IOC单例模式     /// 
    public class UnitySingleton    {        //单例        private static UnitySingleton instance;        //ioc容器        public IUnityContainer container;        //获取单例        public static UnitySingleton getInstance()        {            if (instance == null || instance.container == null)            {                string configFile = "Unity.config";                var fileMap = new ExeConfigurationFileMap { ExeConfigFilename = configFile };                //从config文件中读取配置信息                Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);                //获取指定名称的配置节                UnityConfigurationSection section = (UnityConfigurationSection)configuration.GetSection("unity");                instance = new UnitySingleton()                {                    //container = new UnityContainer().LoadConfiguration((UnityConfigurationSection)ConfigurationManager.GetSection("unity"), "MyContainer")                    container = new UnityContainer().LoadConfiguration(section, "MyContainer")                    //container = new UnityContainer()                };                //instance.container.RegisterType
     
      ();            }            return instance;        }        //IOC注入实体        public static T GetInstanceDAL
      
       ()        {            return getInstance().container.Resolve
       
        ();        }    }}

此处是将Unity config配置单独成一个文件，方便管理。

4.添加IOC相关类

接口类

public interface IExampleClass{    void DoHelloWord();}

具体实现类

public class ExampleClass : IExampleClass    {        public void DoHelloWord()        {            Console.WriteLine("Hello Word!");        }    }

实现类扩展

public class DIExampleClass    {        //属性注入        [Dependency]        public IExampleClass example { get; set; }                private IExampleClass testInject;        public void DoWork()        {            example.DoHelloWord();            testInject.DoHelloWord();        }        //方法注入        [InjectionMethod]        public void Initialize(IExampleClass instance)        {            testInject = instance;        }    }

5.添加配置文件Unity.config

6.函数调用

class Program    {        static void Main(string[] args)        {            //var dao = UnitySingleton.GetInstanceDAL
     
      ();            var dao = UnitySingleton.GetInstanceDAL
      
       ();            dao.DoWork();            Console.ReadLine();        }    }