在MVC控制器中使用构造函数时行依赖注入（IoC)

 在 Controller 中使用 构造函数进行依赖注入 (IoC)

1. Controller 代码&＃xff1a;

 接口 ICard , ICardCateogry 是一个普通的接口&＃xff0c;没有继承或实现任何接口&＃xff0c;而需要做的就是在 Gloable.cs 文件中解析依赖&＃xff0c; 为了方便复用&＃xff0c;将解析依赖封装成一个类&＃xff0c;然后在 Gloable.cs 文件中注册&＃xff0c;在这个示例中&＃xff0c;使用的是 Unity 进行依赖注入&＃xff0c;完整的代码如下&＃xff1a;

using Microsoft.Practices.Unity;
using System;
using System.Collections.Generic;
//using System.Web.Http.Dependencies;
using System.Web;
using System.Web.Mvc;namespace SnsManage.Resolver
{///

/// Dependency Injection Resolver Container ///

public class UnityResolver : IDependencyResolver{protected IUnityContainer container;public UnityResolver(IUnityContainer container){if (container &＃61;&＃61; null){throw new ArgumentNullException("container");}this.container &＃61; container;}public object GetService(Type serviceType){try{return container.Resolve(serviceType);}catch (ResolutionFailedException){return null;}}public IEnumerable<object> GetServices(Type serviceType){try{return container.ResolveAll(serviceType);}catch (ResolutionFailedException){return new List<object>();}}//public IDependencyScope BeginScope()//{// var child &＃61; container.CreateChildContainer();// return new UnityResolver(child);//}//public void Dispose()//{// container.Dispose();//}//private const string HttpContextKey &＃61; "perRequestContainer";//private readonly IUnityContainer container;//public UnityResolver(IUnityContainer container)//{// this.container &＃61; container;//}//public object GetService(Type serviceType)//{// if (typeof(IController).IsAssignableFrom(serviceType))// {// return ChildContainer.Resolve(serviceType);// }// return IsRegistered(serviceType) ? ChildContainer.Resolve(serviceType) : null; //}//public IEnumerable 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 &＃61; HttpContext.Current.Items[HttpContextKey] as IUnityContainer;// if (childContainer &＃61;&＃61; null)// {// HttpContext.Current.Items[HttpContextKey] &＃61; childContainer &＃61; container.CreateChildContainer();// }// return childContainer;// }//} //public static void DisposeOfChildContainer()//{// var childContainer &＃61; HttpContext.Current.Items[HttpContextKey] as IUnityContainer;// if (childContainer !&＃61; null)// {// childContainer.Dispose();// }//}//private bool IsRegistered(Type typeToCheck)//{// var isRegistered &＃61; true;// if (typeToCheck.IsInterface || typeToCheck.IsAbstract)// {// isRegistered &＃61; ChildContainer.IsRegistered(typeToCheck);// if (!isRegistered && typeToCheck.IsGenericType)// {// var openGenericType &＃61; typeToCheck.GetGenericTypeDefinition();// isRegistered &＃61; ChildContainer.IsRegistered(openGenericType);// }// }// return isRegistered;//}
}
}

View Code

然后在 App_Start 文件中添加一个配置类&＃xff0c; UnityConfig.cs, 其中的代码如下&＃xff1a;

最后在 Global.asax 文件中注册