设计模式》桥接模式

例子

• 给用户在不同平台发送消息（微信，APP,H5）

    public abstract class AbsUserManager
    {
        protected AbsUserManager(AbsUserManagerProvider userManagerProvider)
        {
            UserManagerProvider = userManagerProvider;
        }

        protected AbsUserManagerProvider UserManagerProvider { get; }

        /// <summary>
        /// 发送消息
        /// </summary>
        /// <param name="userId"></param>
        /// <param name="msg"></param>
        public void SendMessage(Guid userId, string msg)
        {
            UserManagerProvider.SendMessage(userId, msg);
        }

        /// <summary>
        /// 强制下线
        /// </summary>
        /// <param name="userId"></param>
        public void TapeOut(Guid userId)
        {
            UserManagerProvider.TapeOut(userId);
        }
    }


    public abstract class AbsUserManagerProvider
    {
        /// <summary>
        /// 发送消息
        /// </summary>
        /// <param name="userId"></param>
        /// <param name="msg"></param>
        public abstract void SendMessage(Guid userId, string msg);

        /// <summary>
        /// 强制下线
        /// </summary>
        /// <param name="userId"></param>
        public abstract void TapeOut(Guid userId);
    }

    public class AppUserManager : AbsUserManager
    {
        public AppUserManager(AppUserManagerProvider userManagerProvider) : base(userManagerProvider)
        {
        }
    }

    public class AppUserManagerProvider : AbsUserManagerProvider
    {
        public override void SendMessage(Guid userId, string msg)
        {
            Console.WriteLine($"从APP向{userId.ToString()}发送消息:{msg}");
        }

        public override void TapeOut(Guid userId)
        {
            Console.WriteLine($"从APP把{userId.ToString()}踢下线");
        }
    }


    public class H5UserManager : AbsUserManager
    {
        public H5UserManager(H5UserManagerProvider userManagerProvider) : base(userManagerProvider)
        {
        }
    }

    public class H5UserManagerProvider : AbsUserManagerProvider
    {
        public override void SendMessage(Guid userId, string msg)
        {
            Console.WriteLine($"从H5向{userId.ToString()}发送消息:{msg}");
        }

        public override void TapeOut(Guid userId)
        {
            Console.WriteLine($"从H5把{userId.ToString()}踢下线");
        }
    }

    public class WechatUserManager : AbsUserManager
    {
        public WechatUserManager(WechatUserManagerProvider userManagerProvider) : base(userManagerProvider)
        {
        }
    }

    public class WechatUserManagerProvider : AbsUserManagerProvider
    {
        public override void SendMessage(Guid userId, string msg)
        {
            Console.WriteLine($"从微信向{userId.ToString()}发送消息:{msg}");
        }

        public override void TapeOut(Guid userId)
        {
            throw new NotImplementedException();
        }
    }



        static void Main(string[] args)
        {
            Guid userId = Guid.NewGuid();
            string msg = "123123";

            new H5UserManager(new H5UserManagerProvider()).SendMessage(userId, msg);
            new AppUserManager(new AppUserManagerProvider()).SendMessage(userId, msg);
            new WechatUserManager(new WechatUserManagerProvider()).SendMessage(userId, msg);
            
            
            new H5UserManager(new H5UserManagerProvider()).TapeOut(userId);
            new AppUserManager(new AppUserManagerProvider()).TapeOut(userId);
            new WechatUserManager(new WechatUserManagerProvider()).TapeOut(userId);
        }

个人总结

桥接模式就是 关联的属性是抽象类

参考地址