.NET(C#) 面向切面编程(AOP) Castle Windsor

1、Castle Windsor

Castle最早在2003年诞生于Apache Avalon项目，目的是为了创建一个IOC（控制反转）框架。目前包括四个组件，分别是ActiveRecord(ORM组件),Windsor(IOC组件),DynamicProxy(动态代理组件),MonoRail(Web MVC组件)。

2、安装引用Castle Windsor

1）使用Nuget管理控制台

可以通过打开包管理器控制台（PM）并键入以下语句来安装Castle Windsor：

Install-Package Castle.Windsor

2）使用Nuget图形管理器

使用Nuget的界面的管理器搜索 "Castle.Windsor" => 找到点出点击 "安装"。

3）使用.NET CLI命令安装

> dotnet add TodoApi.csproj package Castle.Windsor

相关文档：VS(Visual Studio)中Nuget的使用

2、使用静态代理实现AOP

使用面向对象的方式实现AOP，代码如下，

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication{    //一般每个接口或类都写在单独的.cs文件中    //本示例为了执行查看方便才写在一起    public class User    {        public string UserName { get; set; }        public string PassWord { get; set; }    }    public interface IUserProcessor    {        void RegUser(User user);    }    public class UserProcessor : IUserProcessor    {        public void RegUser(User user)        {            Console.WriteLine(" 用户已注册。Name:{0},PassWord:{1} ", user.UserName, user.PassWord);        }    }    //通过定义一个装饰器类实现    public class UserProcessorDecorator : IUserProcessor    {        public IUserProcessor UserProcessor { get; set; }        public UserProcessorDecorator(IUserProcessor userprocessor)        {            UserProcessor = userprocessor;        }        public void RegUser(User user)        {            PreProceed(user);            UserProcessor.RegUser(user);            PostProceed(user);        }        public void PreProceed(User user)        {            Console.WriteLine(" 方法执行前 ");        }        public void PostProceed(User user)        {            Console.WriteLine(" 方法执行后 ");        }    }    class Program    {        static void Main(string[] args)        {            User user = new User() { UserName = "wonhero", PassWord = "123456" };            IUserProcessor userprocessor = new UserProcessorDecorator(new UserProcessor());            userprocessor.RegUser(user);            Console.ReadKey();        }    }}

3、使用Castle Windsor DynamicProxy实现AOP

使用Castle Windsor DynamicProxy实现动态代理，代码如下，

using Castle.Core;using Castle.DynamicProxy;using Castle.MicroKernel.Registration;using Castle.Windsor;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication{    //一般每个接口或类都写在单独的.cs文件中    //本示例为了执行查看方便才写在一起    public class ProcessorInterceptor : IInterceptor    {        public void Intercept(IInvocation invocation)        {            try            {                if (invocation.Arguments.Length > 0)                {                    PreProceed(invocation.Arguments[0] as User);                }                invocation.Proceed();                if (invocation.Arguments.Length > 0)                {                    PostProceed(invocation.Arguments[0] as User);                }            }            catch (Exception)            {                Console.WriteLine("方法出错调用");                throw;            }        }        public void PreProceed(User user)        {            Console.WriteLine(" 方法执行前:"+user.UserName);        }        public void PostProceed(User user)        {            Console.WriteLine(" 方法执行后:"+user.UserName);        }    }    public class User    {        public string UserName { get; set; }        public string PassWord { get; set; }    }    public interface IUserProcessor    {        void RegUser(User user);    }    [Interceptor(typeof(ProcessorInterceptor))]    public class UserProcessor : IUserProcessor    {        public void RegUser(User user)        {            Console.WriteLine(" 用户已注册。Name:{0},PassWord:{1} ", user.UserName, user.PassWord);        }    }    class Program    {        static void Main(string[] args)        {            User user = new User() { UserName = "wonhero", PassWord = "123456" };            using (var container = new WindsorContainer())            {                // container.Register(                // Component.For()                //.ImplementedBy()                //.Named("ProcessorInterceptor"));                container.Register(                Component.For()               .ImplementedBy()               );                //container.Register(Component.For().ImplementedBy().Interceptors(InterceptorReference.ForKey("ProcessorInterceptor")).Anywhere);                container.Register(Component.For().ImplementedBy());                var root = container.Resolve();                root.RegUser(user);            }            Console.ReadKey();        }    }}

输出：

 方法执行前:wonhero 用户已注册。Name:wonhero,PassWord:123456 方法执行后:wonhero