構建ASP.NET MVC4+EF5+EasyUI+Unity2.x注入的後台管理系統（6）

Unity 2.x依賴注入by運行時注入[附源碼]

Unity 2.x依賴注入(控制反轉)IOC，對於沒有大項目經驗的童鞋來說，這些都是陌生的名詞，甚至有些同學還停留在拉控件的階段。

您可以訪問http://unity.codeplex.com/releases得到最新版本的Unity現在。當然，如果您在您的visual studio 中安裝了Nuget 包管理器，你可以直接在Nuget中獲取到最新版本的Unity。貌似最新是3了，第5講我們糟糕的代碼演示了接口如何用

這裡http://unity.codeplex.com/documentation我們找到了幫助文檔大家可以下載下來看看

我們采用的是構造函數注入，運行時注入。

這塊的概念可以算算是本系統最模糊的，大家應該好好理解下，博客園一位大蝦的

【ASP.Net MVC3 】使用Unity 實現依賴注入 大家進去看看

這裡我不再詳說了。

貼出代碼，告訴大家怎麼做就好了。

下載http://files.cnblogs.com/ymnets/Microsoft.Practices.Unity.rar

在App.Admin創建Library放進去，以後我們要用到的類庫都放到這裡來，除非說明，引用的類庫都是開源的。

App.Core引用Microsoft.Practices.Unity.dll , System.Web.Mvc, System.Web,3個類庫和4.BLL,App.IBLL,App.DAL,App.IDAL 4個類庫

添加以下2個類

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
    {
        //系統注入
        public static void Container_Sys(ref UnityContainer container)
        {
            container.RegisterType<ISysSampleBLL, SysSampleBLL>();//樣例
            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

在系統開始運行時候我們就把構造函數注入。所以我們要在Global文件寫入代碼
 

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: 有關啟用 IIS6 或 IIS7 經典模式的說明，
    // 請訪問 http://go.microsoft.com/?LinkId=9394801
    
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
    
            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            //啟用壓縮
            BundleTable.EnableOptimizations = true;
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            AuthConfig.RegisterAuth();
    
            //注入 Ioc
            var container = new UnityContainer();
            DependencyRegisterType.Container_Sys(ref container);
            DependencyResolver.SetResolver(new UnityDependencyResolver(container));
        }
    }
}
    
Global.asax.cs

好了，我們已經把