Unity 2.x依赖注入(控制反转)IOC，对于没有大项目经验的童鞋来说，这些都是陌生的名词，甚至有些同学还停留在拉控件的阶段。
您可以访问/releases得到最新版本的Unity现在。当然，如果您在您的visual studio 中安装了Nuget 包管理器，你可以直接在Nuget中获取到最新版本的Unity。貌似最新是3了，第5讲我们糟糕的代码演示了接口如何用
这里/documentation我们找到了帮助文档大家可以下载下来看看
我们采用的是构造函数注入，运行时注入。
这块的概念可以算算是本系统最模糊的，大家应该好好理解下，博客园一位大虾的
【 MVC3 】使用Unity 实现依赖注入大家进去看看
这里我不再详说了。
贴出代码，告诉大家怎么做就好了。
下载/ymnets/Microsoft.Practices.Unity.rar
在App.Admin创建Library放进去，以后我们要用到的类库都放到这里来，除非说明，引用的类库都是开源的。
App.Core引用Microsoft.Practices.Unity.dll , System.Web.Mvc, System.Web,3个类库和4.BLL,App.IBLL,App.DAL,App.IDAL 4个类库
这里提示一下System.Web.Mvc，需要“工具”菜单中“库程序包管理”，弹出的选项中“管理解决方案的nuget程序包，在弹出的对话框中，搜索mvc，
选择 mvc，点击”管理“，这里选择需要mvc的项目就可以。
添加以下2个类
using System;using System.Collections.Generic;using System.Linq;using System.Web;using App.BLL;using App.DAL;using App.IBLL;using App.IDAL;using Microsoft.Practices.Unity;namespace App.Core{public class DependencyRegisterType{//系统注入public static void Container_Sys(ref UnityContainer container){container.RegisterType<ISysSampleBLL, SysSampleBLL>();//样例container.RegisterType<ISysSampleRepository, SysSampleRepository>();}}}
using System;using System.Collections.Generic;using System.Web;using System.Web.Mvc;using Microsoft.Practices.Unity;namespace App.Core{public class UnityDependencyResolver : IDependencyResolver{private const string HttpContextKey = "perRequestContainer";private readonly IUnityContainer _container;public UnityDependencyResolver(IUnityContainer container){_container = container;}public object GetService(Type serviceType){if (typeof(IController).IsAssignableFrom(serviceType)){return ChildContainer.Resolve(serviceType);}return IsRegistered(serviceType) ? ChildContainer.Resolve(serviceType) : null; }public IEnumerable<object> GetServices(Type serviceType){if (IsRegistered(serviceType)){yield return ChildContainer.Resolve(serviceType);}foreach (var service in ChildContainer.ResolveAll(serviceType)){yield return service;}}protected IUnityContainer ChildContainer{get{var childContainer = HttpContext.Current.Items[HttpContextKey] as IUnityContainer;if (childContainer == null){HttpContext.Current.Items[HttpContextKey] = childContainer = _container.CreateChildContainer();}return childContainer;}} public static void DisposeOfChildContainer(){var childContainer = HttpContext.Current.Items[HttpContextKey] as IUnityContainer;if (childContainer != null){childContainer.Dispose();}}private bool IsRegistered(Type typeToCheck){var isRegistered = true;if (typeToCheck.IsInterface || typeToCheck.IsAbstract){isRegistered = ChildContainer.IsRegistered(typeToCheck);if (!isRegistered && typeToCheck.IsGenericType){var openGenericType = typeToCheck.GetGenericTypeDefinition();isRegistered = ChildContainer.IsRegistered(openGenericType);}}return isRegistered;}} }UnityDependencyResolver.cs
在系统开始运行时候我们就把构造函数注入。所以我们要在Global文件写入代码
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Http;using System.Web.Mvc;using System.Web.Optimization;using System.Web.Routing;using App.Core;using Microsoft.Practices.Unity;namespace App.Admin{// 注意: 有关启用 IIS6 或 IIS7 经典模式的说明，// 请访问 /?LinkId=9394801public class MvcApplication : System.Web.HttpApplication{protected void Application_Start(){AreaRegistration.RegisterAllAreas();WebApiConfig.Register(GlobalConfiguration.Configuration);FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);RouteConfig.RegisterRoutes(RouteTable.Routes);//启用压缩BundleTable.EnableOptimizations = true;BundleConfig.RegisterBundles(BundleTable.Bundles);AuthConfig.RegisterAuth();//注入 Iocvar container = new UnityContainer();DependencyRegisterType.Container_Sys(ref container);DependencyResolver.SetResolver(new UnityDependencyResolver(container));}}}Global.asax.cs
好了，我们已经把
ISysSampleBLL, SysSampleBLL
ISysSampleRepository, SysSampleRepository
注入到系统了
由于EF生成的实体模型是拥有事务状态的，我们一直希望把开销减少到最低，我们要重新构造SysSample的类
在App.Models新建文件夹Sys，如非特别说明，Sys代表系统，一个Areas区域对应一个文件，区域我们以后会用到
App.Models要引用ponentModel.DataAnnotations类库
using System;using ponentModel.DataAnnotations;using System.Runtime.Serialization;namespace App.Models.Sys{public class SysSampleModel{[Display(Name = "ID")]public string Id { get; set; }[Display(Name = "名称")]public string Name { get; set; }[Display(Name = "年龄")][Range(0,10000)]public int? Age { get; set; }[Display(Name = "生日")]public DateTime? Bir { get; set; }[Display(Name = "照片")]public string Photo { get; set; }[Display(Name = "简介")]public string Note { get; set; }[Display(Name = "创建时间")]public DateTime? CreateTime { get; set; }}}
为什么我们要这么做？不是已经有SysSample了，我们为什么还要SysSampleModel
我们应该照顾到将来的系统的分布式,BLL层的分发的web服务我们不应该还在controller还在操作底层，应该转为
以后的讲解中，我们会体会到好处。这里带过即可
接下来我们重新写过IBLL,BLL,controller代码，DAL，IDAL的代码是没问题的，很专注底层
BLL引用Microsoft.Practices.Unity类库
修改后的代码
using System.Collections.Generic;using App.Models.Sys;namespace App.IBLL{public interface ISysSampleBLL{/// <summary>/// 获取列表/// </summary>/// <param name="pager">JQgrid分页</param>/// <param name="queryStr">搜索条件</param>/// <returns>列表</returns>List<SysSampleModel> GetList(string queryStr);/// <summary>/// 创建一个实体/// </summary>/// <param name="errors">持久的错误信息</param>/// <param name="model">模型</param>/// <returns>是否成功</returns>bool Create(SysSampleModel model);/// <summary>/// 删除一个实体/// </summary>/// <param name="errors">持久的错误信息</param>/// <param name="id">id</param>/// <returns>是否成功</returns>bool Delete(string id);/// <summary>/// 修改一个实体/// </summary>/// <param name="errors">持久的错误信息</param>/// <param name="model">模型</param>/// <returns>是否成功</returns>bool Edit(SysSampleModel model);/// <summary>/// 根据ID获得一个Model实体/// </summary>/// <param name="id">id</param>/// <returns>Model实体</returns>SysSampleModel GetById(string id);/// <summary>/// 判断是否存在实体/// </summary>/// <param name="id">主键ID</param>/// <returns>是否存在</returns>bool IsExist(string id);}}ISysSampleBLL.cs
using System;using System.Collections.Generic;using System.Linq;using Microsoft.Practices.Unity;using App.Models;using mon;using App.Models.Sys;using App.IBLL;using App.IDAL;namespace App.BLL{public class SysSampleBLL : ISysSampleBLL{DBContainer db = new DBContainer();[Dependency]public ISysSampleRepository Rep { get; set; }/// <summary>/// 获取列表/// </summary>/// <param name="pager">JQgrid分页</param>/// <param name="queryStr">搜索条件</param>/// <returns>列表</returns>public List<SysSampleModel> GetList(string queryStr){IQueryable<SysSample> queryData = null;queryData = Rep.GetList(db);return CreateModelList(ref queryData);}private List<SysSampleModel> CreateModelList(ref IQueryable<SysSample> queryData){List<SysSampleModel> modelList = (from r in queryDataselect new SysSampleModel{Id = r.Id,Name = r.Name,Age = r.Age,Bir = r.Bir,Photo = r.Photo,Note = r.Note,CreateTime = r.CreateTime,}).ToList();return modelList;}/// <summary>/// 创建一个实体/// </summary>/// <param name="errors">持久的错误信息</param>/// <param name="model">模型</param>/// <returns>是否成功</returns>public bool Create( SysSampleModel model){try{SysSample entity = Rep.GetById(model.Id);if (entity != null){return false;}entity = new SysSample();entity.Id = model.Id;entity.Name = model.Name;entity.Age = model.Age;entity.Bir = model.Bir;entity.Photo = model.Photo;entity.Note = model.Note;entity.CreateTime = model.CreateTime;if (Rep.Create(entity) == 1){return true;}else{return false;}}catch (Exception ex){//ExceptionHander.WriteException(ex);return false;}}/// <summary>/// 删除一个实体/// </summary>/// <param name="errors">持久的错误信息</param>/// <param name="id">id</param>/// <returns>是否成功</returns>public bool Delete(string id){try{if (Rep.Delete(id) == 1){return true;}else{return false;}}catch (Exception ex){return false;}}/// <summary>/// 修改一个实体/// </summary>/// <param name="errors">持久的错误信息</param>/// <param name="model">模型</param>/// <returns>是否成功</returns>public bool Edit(SysSampleModel model){try{SysSample entity = Rep.GetById(model.Id);if (entity == null){return false;}entity.Name = model.Name;entity.Age = model.Age;entity.Bir = model.Bir;entity.Photo = model.Photo;entity.Note = model.Note;if (Rep.Edit(entity) == 1){return true;}else{return false;}}catch (Exception ex){//ExceptionHander.WriteException(ex);return false;}}/// <summary>/// 判断是否存在实体/// </summary>/// <param name="id">主键ID</param>/// <returns>是否存在</returns>public bool IsExists(string id){if (db.SysSample.SingleOrDefault(a => a.Id == id) != null){return true;}return false;}/// <summary>/// 根据ID获得一个实体/// </summary>/// <param name="id">id</param>/// <returns>实体</returns>public SysSampleModel GetById(string id){if (IsExist(id)){SysSample entity = Rep.GetById(id);SysSampleModel model = new SysSampleModel();model.Id = entity.Id;model.Name = entity.Name;model.Age = entity.Age;model.Bir = entity.Bir;model.Photo = entity.Photo;model.Note = entity.Note;model.CreateTime = entity.CreateTime;return model;}else{return new SysSampleModel();}}/// <summary>/// 判断一个实体是否存在/// </summary>/// <param name="id">id</param>/// <returns>是否存在 true or false</returns>public bool IsExist(string id){return Rep.IsExist(id);}}}SysSampleBLL.cs
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using App.BLL;using App.IBLL;using App.Models;using App.Models.Sys;using Microsoft.Practices.Unity;namespace App.Admin.Controllers{public class SysSampleController : Controller{//// GET: /SysSample//// <summary>/// 业务层注入/// </summary>[Dependency]public ISysSampleBLL m_BLL { get; set; }public ActionResult Index(){List<SysSampleModel> list = m_BLL.GetList("");return View(list);}}}SysSampleController.cs
@model List<App.Models.Sys.SysSampleModel>@{Layout = null;}<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width" /><title>Index</title></head><body><p>@Html.ActionLink("Create New", "Create")</p><table><tr><th>名称</th><th>年龄</th><th>生日</th><th>照片</th><th>备注</th><th>创建时间</th><th></th></tr>@foreach (var item in Model) {<tr><td>@Html.DisplayFor(modelItem => item.Name)</td><td>@Html.DisplayFor(modelItem => item.Age)</td><td>@Html.DisplayFor(modelItem => item.Bir)</td><td>@Html.DisplayFor(modelItem => item.Photo)</td><td>@Html.DisplayFor(modelItem => item.Note)</td><td>@Html.DisplayFor(modelItem => item.CreateTime)</td><td>@Html.ActionLink("Edit", "Edit", new { id=item.Id }) |@Html.ActionLink("Details", "Details", new { id=item.Id }) |@Html.ActionLink("Delete", "Delete", new { id=item.Id })</td></tr>}</table></body></html>View视图
因为SysSample在BLL层已经被释放掉了，大家要注意一下所以视图我们要改下
大家把代码下载下来，跟我们第5讲糟糕的代码对比一下。我们的代码优化了，清晰了，构造器能自动释放内存了，无需要实例化了。
当然预览的效果是一样的
这样我们的系统实现了注入，我们需要好好理解这一讲，后面我们要演示AOP面向方面，对系统日志和异常的处理。
我们有4层异常捕获，你还怕你的系统在运行中出现不明的错误吗？？？？不过再次之前我们要将我们的系统变得更加有趣先。
下一讲，返回json格式与DataGrid结合，实现分页。
代码下载代码不包含packages文件夹，你编译可能会出错，把你的MVC4项目下的packages复制一份到解决方案下即可
构建 MVC4+EF5+EasyUI+Unity2.x注入的后台管理系统（6）-Unity 2.x依赖注入by运行时注入[附源码]...
