设计模式》适配器模式

xxxVideo

    public sealed class PornAdaptee
    {
        public void Watch(Guid videoId)
        {
            Console.WriteLine($"查看视频{videoId.ToString()}");
        }

        public void Download(Guid videoId)
        {
            Console.WriteLine($"下载视频{videoId.ToString()}");
        }
    }


    public interface I91PornTarget
    {
        void Watch(Guid videoId);

        void Download(Guid videoId);
    }

    public class Rank91PornAdapter : I91PornTarget
    {
        protected PornAdaptee PornAdaptee { get; }

        public Rank91PornAdapter(PornAdaptee pornAdaptee)
        {
            PornAdaptee = pornAdaptee;
        }

        public void Watch(Guid videoId)
        {
            var d = new Random(2).Next(2);
            if (d < 2)
            {
                Console.WriteLine("你是普通用户，看不了");
            }
            else
            {
                PornAdaptee.Watch(videoId);
            }
        }

        public void Download(Guid videoId)
        {
            var d = new Random(2).Next(2);
            if (d < 2)
            {
                Console.WriteLine("你是普通用户，下载不了");
            }
            else
            {
                PornAdaptee.Watch(videoId);
            }
        }
    }

    public class Vip91PornAdapter : I91PornTarget
    {
        protected PornAdaptee PornAdaptee { get; }

        public Vip91PornAdapter(PornAdaptee pornAdaptee)
        {
            PornAdaptee = pornAdaptee;
        }

        public void Watch(Guid videoId)
        {
            {
                PornAdaptee.Watch(videoId);
            }
        }

        public void Download(Guid videoId)
        {
            {
                PornAdaptee.Watch(videoId);
            }
        }
    }

总结 ：为某一个类做适配（不适合用抽象类）

参考地址