Aop之使用Castle动态代理实现对方法的拦截

using System;
using System.Linq;
using Castle.DynamicProxy;

namespace AopTest
{
    class AopTest
    {
        static public void Test()
        {
            var proxyGenerator = new ProxyGenerator();
            IUserService user = proxyGenerator.CreateClassProxy<UserService>(new UserRigthCheckProxy());
            user.GetUser("admin");
            user.GetUser("guest");
            user.UpdateUser("admin");
            user.UpdateUser("guest");
        }
    }

    public interface IUserService
    {
        void GetUser(string userId);
        void UpdateUser(string userId);
    }

    public class UserService : IUserService
    {
        public virtual void GetUser(string userId)
        {
            Console.WriteLine(userId + ",Welcome!");
        }
        public virtual void UpdateUser(string userId)
        {
            Console.WriteLine(userId + ",Updated!");
        }
    }

    public class UserRigthCheckProxy : IInterceptor
    {
        private static readonly string[] RightOperations = new string[] { "UpdateUser" };
        public void Intercept(IInvocation invocation)
        {
            if (invocation.Arguments.Length >  && invocation.Arguments[] is string)
            {
                if (RightOperations.Contains(invocation.Method.Name))
                {
                    var userId = (string) invocation.Arguments[];
                    if (userId == "admin")
                    {
                        Console.WriteLine("有权限操作 ");
                        invocation.Proceed();
                    }
                    else
                    {
                        Console.WriteLine("{0},您没有权限操作", userId);
                    }
                }
                else
                {
                    Console.WriteLine("有权限操作 ");
                    invocation.Proceed();
                }
            }
            else
            {
                invocation.Proceed();
            }
        }
    }
}