设计模式：桥接模式

桥接模式（Bridge）：将抽象部分与它的实现部分分离，使它们都额可以独立地变化。

namespace BridgeDesign
{
    public abstract class Implementor
    {
        public abstract void Operation();
    }
    public class ConcreteImplementorA : Implementor
    {
        public override void Operation()
        {
            Console.WriteLine("具体实现A的方法执行");
        }
    }
    public class ConcreteImplementorB : Implementor
    {
        public override void Operation()
        {
            Console.WriteLine("具体实现B的方法执行");
        }
    }
    public class Abstraction
    {
        protected Implementor implementor;
        public void SetImplementor(Implementor implementor)
        {
            this.implementor = implementor;
        }
        public virtual void Operation()
        {
            implementor.Operation();
        }
    }
    public class RefinedAbstraction:Abstraction
    {
        public override void Operation()
        {
            implementor.Operation();
        }
    }
}

测试代码：

            Abstraction ab = new RefinedAbstraction();
            ab.SetImplementor(new ConcreteImplementorA());
            ab.Operation();
            ab.SetImplementor(new ConcreteImplementorB());
            ab.Operation();