装饰器模式

//被装饰类和装饰类都要实现的接口
    public interface ISource {
        void DoSomething();
    }

    //被装饰类
    public class Source : ISource
    {
        public void DoSomething()
        {
            Console.WriteLine("原始方法");
        }
    }

    //装饰类
    public class Decorator : ISource
    {
        ISource source;

        //通过构造函数注入需要装饰的对象，使装饰对象持有被砖石对象
        public Decorator(ISource source) {
            this.source = source;
        }
        public void DoSomething()
        {
            //在这里动态的增加新功能
            Console.WriteLine("新增的功能");
            source.DoSomething();
            Console.WriteLine("也是新增的功能");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ISource source = new Source();
            ISource decorator = new Decorator(source);
            decorator.DoSomething();
            Console.Read();
        }
    }