internal interface IInterceptor
    {
    }
    internal interface IInterceptorAction : IInterceptor
    {
        /// <summary>
        /// 執(zhí)行之前
        /// </summary>
        /// <param name="args">參數(shù)</param>
        void AfterAction(object?[]? args);
        /// <summary>
        /// 執(zhí)行之后
        /// </summary>
        /// <param name="args">參數(shù)</param>
        /// <param name="result">結(jié)果</param>
        void BeforeAction(object?[]? args, object? result);
    }

 [AttributeUsage(AttributeTargets.Class)]
    internal class BaseInterceptAttribute : Attribute, IInterceptor
    {
    }

internal class DynamicProxy<T> : DispatchProxy
    {
        public T Decorated { get; set; }//目標(biāo)類(lèi)
        public IEnumerable<IInterceptorAction> Interceptors { get; set; }  // AOP動(dòng)作
        /// <summary>
        /// 創(chuàng)建代理實(shí)例
        /// </summary>
        /// <param name="decorated">代理的接口類(lèi)型</param>
        /// <param name="afterAction">方法執(zhí)行前執(zhí)行的事件</param>
        /// <param name="beforeAction">方法執(zhí)行后執(zhí)行的事件</param>
        /// <returns></returns>
        public T Create(T decorated, IEnumerable<IInterceptor> interceptors)
        {
            object proxy = Create<T, DynamicProxy<T>>(); // 調(diào)用DispatchProxy 的Create  創(chuàng)建一個(gè)代理實(shí)例
            DynamicProxy<T> proxyDecorator = (DynamicProxy<T>)proxy;
            proxyDecorator.Decorated = decorated;
            proxyDecorator.Interceptors = interceptors.Where(c=>c.GetType().GetInterface(typeof(IInterceptorAction).Name) == typeof(IInterceptorAction)).Select(c=>c as IInterceptorAction);
            return (T)proxy;
        }

protected override object? Invoke(MethodInfo? targetMethod, object?[]? args)
        {
            Exception exception = null;//由委托捕獲變量，用來(lái)存儲(chǔ)異常
            Func<object?[]?, object?> action = (args) =>
            {
                try
                {
                    return targetMethod?.Invoke(Decorated, args);
                }
                catch (Exception ex)//捕獲異常，不影響AOP繼續(xù)執(zhí)行
                {
                    exception = ex;
                }
                return null;
            };
            //進(jìn)行倒序，使其按照由外置內(nèi)的流程執(zhí)行
            foreach (var c in Interceptors.Reverse())
            {
                action = AssembleAction(action, c);
            }
            //執(zhí)行組裝好的流程
            var result = action?.Invoke(args);
            //如果方法有異常拋出異常
            if (exception != null)
            {
                throw exception;
            }
            return result;
        }
        private Func<object?[]?, object?>? AssembleAction(Func<object?[]?, object?>? action, IInterceptorAction c)
        {
            return (args) =>
            {
                //執(zhí)行之前的動(dòng)作
                AfterAction(c.AfterAction, args);
                var result = action?.Invoke(args);
                //執(zhí)行之后的動(dòng)作
                BeforeAction(c.BeforeAction, args, result);
                return result;
            };
        }
        private void AfterAction(Action<object?[]?> action, object?[]? args)
        {
            try
            {
                action(args);
            }
            catch (Exception ex)
            {
                Console.WriteLine($"執(zhí)行之前異常：{ex.Message}，{ex.StackTrace}");
            }
        }
        private void BeforeAction(Action<object?[]?, object?> action, object?[]? args, object? result)
        {
            try
            {
                action(args, result);
            }
            catch (Exception ex)
            {
                Console.WriteLine($"執(zhí)行之后異常：{ex.Message}，{ex.StackTrace}");
            }
        }
    }

internal class ProxyFactory
    {
        /// <summary>
        /// 創(chuàng)建代理實(shí)例
        /// </summary>
        /// <param name="decorated">代理的接口類(lèi)型</param>
        /// <returns></returns>
        public static T Create<T>()
        {
            var decorated = ServiceHelp.GetService<T>();
            var type = decorated.GetType();
            var interceptAttribut = type.GetCustomAttributes<BaseInterceptAttribute>();
            //創(chuàng)建代理類(lèi)
            var proxy = new DynamicProxy<T>().Create(decorated, interceptAttribut);
            return proxy;
        }
    }

public static class ServiceHelp
    {
        public static IServiceProvider? serviceProvider { get; set; }
        public static void BuildServiceProvider(IServiceCollection serviceCollection)
        {
            //構(gòu)建容器
            serviceProvider = serviceCollection.BuildServiceProvider();
        }
        public static T GetService<T>(Type serviceType)
        {
            return (T)serviceProvider.GetService(serviceType);
        }
        public static T GetService<T>()
        {
            return serviceProvider.GetService<T>();
        }
    }

internal class AOPTest1Attribut : BaseInterceptAttribute, IInterceptorAction
    {
        public void AfterAction(object?[]? args)
        {
            Console.WriteLine($"AOP1方法執(zhí)行之前，args：{args[0] + "," + args[1]}");
            // throw new Exception("異常測(cè)試（異常，但依然不能影響程序執(zhí)行）");
        }
        public void BeforeAction(object?[]? args, object? result)
        {
            Console.WriteLine($"AOP1方法執(zhí)行之后，result：{result}");
        }
    }
    internal class AOPTest2Attribut : BaseInterceptAttribute, IInterceptorAction
    {
        public void AfterAction(object?[]? args)
        {
            Console.WriteLine($"AOP2方法執(zhí)行之前，args：{args[0] + "," + args[1]}");
        }
        public void BeforeAction(object?[]? args, object? result)
        {
            Console.WriteLine($"AOP2方法執(zhí)行之后，result：{result}");
        }
    }

internal interface ITestService
    {
        public int Add(int a, int b);
    }
    [AOPTest2Attribut]
    [AOPTest1Attribut]
    internal class TestService : ITestService
    {
        public int Add(int a, int b)
        {
            Console.WriteLine($"正在執(zhí)行--》Add({a},)");
            //throw new Exception("方法執(zhí)行--》測(cè)試異常");
            return a + b;
        }
    }

IServiceCollection serviceCollection = new ServiceCollection();
serviceCollection.AddTransient<ITestService, TestService>();
ServiceHelp.BuildServiceProvider(serviceCollection);
//用工廠(chǎng)獲取代理實(shí)例
var s = ProxyFactory.Create<ITestService>();
var sum = s.Add(1, 2);