Unity

最新源代码：https://github.com/unitycontainer/unity

Unity是轻量级、可扩展的依赖注入容器,用于对框架的解耦和增强可扩展性。Unity生于微软。想了解IOC的前世今生可以看下Spring.NET。

一、MVC使用Unity

1.使用

先不管Unity，新建类库，随便写几个Service

public interface IArticleService
    {
        string GetArticle();
    }

------
    public class ArticleService:IArticleService
    {
        public string GetArticle()
        {
            return "sso";
        }
    }

首先在MVC项目上安装NuGet包：Unity.Mvc

安装完成后会在MVC项目的App_Start文件中看到自动加入了两个文件：UnityConfig.cs、UnityMvcActivator.cs；后者的作用可以看前文：动态注册Httpmodule；

 这个时候我们注册类型到IOC容器

using System;
using Practice.IocUnity.Service;
using Practice.IocUnity.Service.Interface;
using Unity;
using Unity.Lifetime;

namespace Practice.IocUnity.Web
{
    /// <summary>
    /// Specifies the Unity configuration for the main container.
    /// </summary>
    public static class UnityConfig
    {
        #region Unity Container
        private static Lazy<IUnityContainer> container =
          new Lazy<IUnityContainer>(() =>
          {
              var container = new UnityContainer();
              RegisterTypes(container);
              return container;
          });

        /// <summary>
        /// Configured Unity Container.
        /// </summary>
        public static IUnityContainer Container => container.Value;
        #endregion

        /// <summary>
        /// Registers the type mappings with the Unity container.
        /// </summary>
        /// <param name="container">The unity container to configure.</param>
        /// <remarks>
        /// There is no need to register concrete types such as controllers or
        /// API controllers (unless you want to change the defaults), as Unity
        /// allows resolving a concrete type even if it was not previously
        /// registered.
        /// </remarks>
        public static void RegisterTypes(IUnityContainer container)
        {
            // NOTE: To load from web.config uncomment the line below.
            // Make sure to add a Unity.Configuration to the using statements.
            // container.LoadConfiguration();使用配置文件

            // TODO: Register your type's mappings here.
            container.RegisterType<IArticleService, ArticleService>(new ContainerControlledLifetimeManager());



        }
    }
}

2、单例模式

上面我们添加了一行代码：container.RegisterType<IArticleService, ArticleService>(new ContainerControlledLifetimeManager());这句的作用是把IArticleService和ArticleService的映射注入容器，new ContainerControlledLifetimeManager()参数是通过lifetime管理，单例模式

如果不需要也可以使用：container.RegisterType<IArticleService, ArticleService>();即可

另外Unity还提供通过配置文件的方式进行：

<configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,
             Microsoft.Practices.Unity.Configuration" />
  </configSections>
  <unity>
    <containers>
      <container name="defaultContainer">
        <register type="Practice.IocUnity.Service.Interface.IArticleService, Practice.IocUnity.Service.Interface" mapTo="Practice.IocUnity.Service.ArticleService, Practice.IocUnity.Service"/>
<lifetime type="singleton" />
      </container>
    </containers>
  </unity>