class1.cs

来自「来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOpt」· CS 代码 · 共 93 行

// Memento pattern -- Structural example  

using System;

namespace DoFactory.GangOfFour.Memento.Structural
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            Originator o = new Originator();
            o.State = "On";

            // Store internal state 
            Caretaker c = new Caretaker();
            c.Memento = o.CreateMemento();

            // Continue changing originator 
            o.State = "Off";

            // Restore saved state 
            o.SetMemento(c.Memento);

            // Wait for user 
            Console.Read();
        }
    }

    // "Originator" 

    class Originator
    {
        private string state;

        // Property 
        public string State
        {
            get { return state; }
            set
            {
                state = value;
                Console.WriteLine("State = " + state);
            }
        }

        public Memento CreateMemento()
        {
            return (new Memento(state));
        }

        public void SetMemento(Memento memento)
        {
            Console.WriteLine("Restoring state:");
            State = memento.State;
        }
    }

    // "Memento" 

    class Memento
    {
        private string state;

        // Constructor 
        public Memento(string state)
        {
            this.state = state;
        }

        // Property 
        public string State
        {
            get { return state; }
        }
    }

    // "Caretaker" 

    class Caretaker
    {
        private Memento memento;

        // Property 
        public Memento Memento
        {
            set { memento = value; }
            get { return memento; }
        }
    }
}