Autofac和DynamicProxy2搭配实现Aop动手训练

http://www.cnblogs.com/zhengwl/p/5433181.html

Aop含义:aspect-oriented programming

• 实现工具介绍 

　　Autofac是一个比较流行的Ioc组件，DynamicProxy2是 the Castle Project core的一部分，提供了一个拦截框架

• 组件安装和实现步骤

1.先打开vs新建一个web项目，打开nuget执行安装命令如下图所示

2.配置autofac

在Global.asax文件中在添加如下代码

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public class Global : HttpApplication, IContainerProviderAccessor

{

static IContainerProvider _containerProvider;

// Instance property that will be used by Autofac HttpModules   // to resolve and inject dependencies.

public IContainerProvider ContainerProvider { get { return _containerProvider; } }

}

在Application_Start方法中配置

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void Application_Start(object sender, EventArgs e)

{

// 在应用程序启动时运行的代码

RouteConfig.RegisterRoutes(RouteTable.Routes);

BundleConfig.RegisterBundles(BundleTable.Bundles);

// Build up your application container and register your dependencies.    

var builder = new ContainerBuilder();

// Once you're done registering things, set the container     // provider up with your registrations.  

builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly());

builder.RegisterType<Calculator>().EnableClassInterceptors().InterceptedBy(typeof(CallLogger)).As<ICalculator>();        

builder.RegisterType<CallLogger>();

var container = builder.Build();

_containerProvider = new ContainerProvider(container);

}

3.aop示例代码如下包含一个接口，一个实现类和一个拦截类

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public interface ICalculator

{

int Add(int lhs, int rhs);

int Multiply(int lhs, int rhs);

}

[Intercept(typeof(CallLogger))]

public class Calculator : ICalculator

{

public virtual int Add(int lhs, int rhs)

{

return lhs + rhs;

}

public virtual int Multiply(int lhs, int rhs)

{

return lhs * rhs;

}

}

public class CallLogger : IInterceptor

{

TextWriter _output = HttpContext.Current.Response.Output;

//public CallLogger(TextWriter output)

//{

//    _output = output;

//}

public void Intercept(IInvocation invocation)

{

_output.Write("Calling method {0} with parameters {1}... ",

invocation.Method.Name,

string.Join(", ", invocation.Arguments.Select(a => (a ?? "").ToString()).ToArray()));

invocation.Proceed();

_output.WriteLine("Done: result was {0}.", invocation.ReturnValue);

}

}

　　global文件中的代码已经写完，其引用应该包括如下几个

using Autofac;
using Autofac.Extras.DynamicProxy2;
using Autofac.Integration.Web;
using Castle.Core;
using Castle.DynamicProxy;

4.效果展现，在Page页添加如下代码，然后运行浏览。

 public partial class _Default : Page
    {
        //public ICalculator handler { get; set; }
        protected void Page_Load(object sender, EventArgs e)
        {
            var cpa = (IContainerProviderAccessor)HttpContext.Current.ApplicationInstance;
            var cp = cpa.ContainerProvider;
            var handler = cp.RequestLifetime.Resolve<ICalculator>();
            var test = handler.Add(1, 33);
            Response.Write(test.ToString());
        }
    }

训练结束，

参考文档http://docs.autofac.org/en/v3.5.2/advanced/interceptors.html#enabling-interception