桥梁（Bridge）模式

        static void Main(string[] args)
        {
            Abstraction abstraction = new RefinedAbstraction();
             
            abstraction.Implementor = new ConcreteImplementorA();
            abstraction.Operation();

            abstraction.Implementor = new ConcreteImplementorB();
            abstraction.Operation();

            Console.ReadLine();
        }

    /// <summary>
    /// 抽象化(Abstraction)角色
    /// </summary>
    public class Abstraction
    {
        protected Implementor implementor;

        // 属性
        public Implementor Implementor
        {
            set { implementor = value; }
        }

        virtual public void Operation()
        {
            implementor.Operation();
        }

    }

    /// <summary>
    /// 实现化(Implementor)角色
    /// </summary>
    public abstract class Implementor
    {
        public abstract void Operation();
    }

    // 修正抽象化(Refined Abstraction)角色
    public class RefinedAbstraction : Abstraction
    {
        public override void Operation()
        {
            implementor.Operation();
        }

    }

    // 具体实现化(Concrete Implementor)角色A
    public class ConcreteImplementorA : Implementor
    {
        public override void Operation()
        {
            Console.WriteLine("ConcreteImplementorA Operation");
        }
    }

    // 具体实现化(Concrete Implementor)角色B
    public class ConcreteImplementorB : Implementor
    {
        public override void Operation()
        {
            Console.WriteLine("ConcreteImplementorB Operation");
        }
    }