动态代理的5模式使用示例和Mixin模式

重量级的ORM和IOC产品离不开动态代理,作为开发人员,多数情况不用关注动态代理的内部实现机制,但是了解其一般的规律和模式还是有必要的,比如:虽然你开发期间采用了POCO,因为开启了动态代理,运行期间则不是POCO。本文简单描述了5种代理生成模式和1种Mixin模式,最后给出一个示例。

复制代码 代码如下:


public interface IPlayable
    {
        void Play();
    }

public class Animal : IPlayable
    {
        public virtual void Play()
        {
            Console.WriteLine("Animal.Play");
        }
    }

public class Dog : Animal
    {
        public override void Play()
        {
            Console.WriteLine("Dog.Play");
        }
    }

public interface IRunable
    {
        void Run();
    }

public class RunAbility : IRunable
    {
        public void Run()
        {
            Console.WriteLine("RunAbility.Run");
        }
    }

public class AnimalInterceptor : IInterceptor
    {
        public void Intercept(IInvocation invocation)
        {
            Console.WriteLine("Before AnimalInterceptor.Intercept");
            if (invocation.InvocationTarget != null)
            {
                invocation.Proceed();
            }
            Console.WriteLine("After AnimalInterceptor.Intercept");
        }
    }

第一种:ClassProxy

复制代码 代码如下:


{
                Console.WriteLine("\n*************ClassProxy*************\n");
                var generator = new ProxyGenerator();
                var animal = generator.CreateClassProxy<Animal>(new AnimalInterceptor());
                animal.Play();

Console.WriteLine(animal.GetType());
                Console.WriteLine(animal.GetType().BaseType);

var compositeField = animal.GetType().GetField("__target");
                Console.WriteLine(compositeField);

foreach (var interfaceType in animal.GetType().GetInterfaces())
                {
                    Console.WriteLine(interfaceType);
                }
            }


动态代理的5模式使用示例和Mixin模式

第二种:ClassProxyWithTarget

复制代码 代码如下:


{
                Console.WriteLine("\n*************ClassProxyWithTarget*************\n");
                var generator = new ProxyGenerator();
                var animal = generator.CreateClassProxyWithTarget<Animal>(new Dog(), new AnimalInterceptor());
                animal.Play();

Console.WriteLine(animal.GetType());
                Console.WriteLine(animal.GetType().BaseType);

var compositeField = animal.GetType().GetField("__target");
                Console.WriteLine(compositeField);

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