设计模式 -- 装饰器

Posted 2022-10-25 qgbo

装饰器模式的核心是有继承有组合，继承和组合的抽象类还是一个！

用起来就是一层层的嵌套：

BaseCharacter character = new Mage();
character = new BaseDecorator(character);//
character = new DecoratorHelmet(character);//
character = new DecoratorShoulder(character);//
character = new DecoratorBreastplate(caracter);
character = new DecoratorCuish(character);
character = new DecoratorGlove(character);

能不能链式写呢？

 public class BaseDecorator : BaseCharacter
    
        private BaseCharacter _BaseCharacter = null;
        public BaseDecorator(BaseCharacter character)
        
            this._BaseCharacter = character;
        

        public override void Show()
        
            this._BaseCharacter.Show();
        
        public BaseDecorator Decorat<T>() where T : BaseDecorator
        
            return (T)Activator.CreateInstance(typeof(T), new object[]  this);
        
    

这样就可以链式了！

 BaseCharacter character = new Mage();

 character = new BaseDecorator(character).Decorat<DecoratorHelmet>().Decorat<DecoratorCuish>();//
 character.Show();