DI 依赖注入之unity的MVC版本使用Microsoft.Practices.Unity1.2与2.0版本对比

DI 依赖注入之unity的MVC版本使用Microsoft.Practices.Unity1.2与2.0版本对比

参考：https://www.cnblogs.com/xishuai/p/3670292.html

参考：https://docs.microsoft.com/en-us/previous-versions/msp-n-p/ff660914(v=pandp.20)?redirectedfrom=MSDN#config_registerelement

必读：

在unity1.2中我们使用构造器注入、属性注入和方法注入会有parameterType节点，就是说在constructor、property和method这些节点可以配置这些方式注入所依赖的类型，但是在unity2.0并不存在parameterType节点了，所有类型注册都是通过register节点进行配置的，相当于unity1.2中的type节点，虽然unity2.0存在constructor、property和method节点，但我感觉只是针对构造器、属性和方法本身进行注入。另外在unity2.0配置中alias节点下的生命管理周期配置并不需要了。

一.下载安装：

Microsoft.Practices.Unity.dll

Microsoft.Practices.Unity.Configuration.dll

下载地址：

二.配置：

1.在App_Start文件夹下创建UnityConfig.cs文件

using Microsoft.Practices.Unity;

using Microsoft.Practices.Unity.Configuration;

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using ZLP.BLL;

using ZLP.DAL;

using ZLP.IBLL;

using ZLP.IDAL;

using ZLP.MVC.Controllers;

namespace ZLP.MVC

{

    public class UnityConfig

    {

        public static void RegisterComponents()

        {

            var container = new UnityContainer();

            //代码注入

           // container.RegisterType<IUserDAL, UserDAL>();

            //container.RegisterType<IUserBLL, UserBLL>();

            //配置文件注入

            var section=(UnityConfigurationSection)ConfigurationManager.GetSection(UnityConfigurationSection.SectionName);

            section.Configure(container);

            DependencyResolver.SetResolver(new ZLPDependencyResolver(container));

        }

    }

}

2.在App_Start文件夹下创建ZLPDependencyResolver.cs文件（创建一个实现IDependencyResolver的类）

using Microsoft.Practices.Unity;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

namespace ZLP.MVC

{

    public class ZLPDependencyResolver : IDependencyResolver

    {

        public ZLPDependencyResolver(IUnityContainer container)

        {

            this.container = container;

        }

        IUnityContainer container;

        public object GetService(Type serviceType)

        {

            try

            {

                return this.container.Resolve(serviceType);

            }

            catch (Exception)

            {

                return null;

            }

        }

        public IEnumerable<object> GetServices(Type serviceType)

        {

            try

            {

                return this.container.ResolveAll(serviceType);

            }

            catch (Exception)

            {

                return Enumerable.Empty<object>();

            }

        }

    }

}

3.在Global文件中Application_Start方法中增加一行代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Web.Optimization;

using System.Web.Routing;

namespace ZLP.MVC

{

    public class MvcApplication : System.Web.HttpApplication

    {

        protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            UnityConfig.RegisterComponents();//增加unity的方法调用

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Web.Optimization;

using System.Web.Routing;

namespace ZLP.MVC

{

    public class MvcApplication : System.Web.HttpApplication

    {

        protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            UnityConfig.RegisterComponents();//增加unity的方法调用

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Web.Optimization;

using System.Web.Routing;

namespace ZLP.MVC

{

    public class MvcApplication : System.Web.HttpApplication

    {

        protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            UnityConfig.RegisterComponents();//增加unity的方法调用

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

        }

    }

}

三.配置文件：

版本：1.2

1.2中的节点：

DI 依赖注入之unity的MVC版本使用Microsoft.Practices.Unity1.2与2.0版本对比

  <configSections>

    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>

  </configSections>

  <unity>

    <typeAliases>

      <typeAlias alias="IUserBLL" type="ZLP.IBLL.IUserBLL,ZLP.IBLL" />

      <typeAlias alias="UserBLL" type="ZLP.BLL.UserBLL,ZLP.BLL" />

    </typeAliases>

    <containers>

      <container name="defaultContainer">

        <type type="IUserBLL" mapTo="UserBLL" name="a"></type >

      </container>

    </containers>

  </unity>

版本：2.0

2.0中节点变更为如下：

The <unity> Configuration Section
The <container> Element
The <register> Element
The <lifetime> Element
The <constructor> Element
The <property> Element
The <method> Element
The <param> Element
The <dependency> Element
The <value> Element
The <optional> Element
The <array> Element
The <extension> Element
The <instance> Element
The <namespace > Element
The <alias> Element
The <sectionExtension> Element

<configSections>

    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />

  </configSections>

  <unity>

    <alias alias="IUserDAL" type="ZLP.IDAL.IUserDAL,ZLP.IDAL" />

    <alias alias="UserDAL" type="ZLP.DAL.UserDAL,ZLP.DAL" />

    <alias alias="IUserBLL" type="ZLP.IBLL.IUserBLL,ZLP.IBLL" />

    <alias alias="UserBLL" type="ZLP.BLL.UserBLL,ZLP.BLL" />

    <container>

      <register type="IUserDAL" mapTo="UserDAL"></register>

      <register type="IUserBLL" mapTo="UserBLL"></register>

    </container>

  </unity>

详细的查看官方地址：https://docs.microsoft.com/en-us/previous-versions/msp-n-p/ff660914(v=pandp.20)?redirectedfrom=MSDN#config_registerelement