static void Main2301()
{
Console.WriteLine("Hello Visitor Pattern!");
var objectStructure = new ObjectStructure();
var concreteNodeA = new ConcreteNodeA();
var concreteNodeB = new ConcreteNodeB();
objectStructure.Add(concreteNodeA);
objectStructure.Add(concreteNodeB);
Console.WriteLine("------------------访问者A访问元素------------------");
objectStructure.Action(new ConcreteVisitorA());
Console.WriteLine("------------------访问者B访问元素------------------");
objectStructure.Action(new ConcreteVisitorB());
Console.ReadLine();
}