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