class1.cs

来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOptimized项

// Memento pattern -- Real World example  

using System;

namespace DoFactory.GangOfFour.Memento.RealWorld
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            SalesProspect s = new SalesProspect();
            s.Name = "Noel van Halen";
            s.Phone = "[phone]";
            s.Budget = 25000.0;

            // Store internal state 
            ProspectMemory m = new ProspectMemory();
            m.Memento = s.SaveMemento();

            // Continue changing originator 
            s.Name = "Leo Welch";
            s.Phone = "[phone]";
            s.Budget = 1000000.0;

            // Restore saved state 
            s.RestoreMemento(m.Memento);

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

    // "Originator" 

    class SalesProspect
    {
        private string name;
        private string phone;
        private double budget;

        // Properties 
        public string Name
        {
            get { return name; }
            set
            {
                name = value;
                Console.WriteLine("Name: " + name);
            }
        }

        public string Phone
        {
            get { return phone; }
            set
            {
                phone = value;
                Console.WriteLine("Phone: " + phone);
            }
        }

        public double Budget
        {
            get { return budget; }
            set
            {
                budget = value;
                Console.WriteLine("Budget: " + budget);
            }
        }

        public Memento SaveMemento()
        {
            Console.WriteLine("\nSaving state --\n");
            return new Memento(name, phone, budget);
        }

        public void RestoreMemento(Memento memento)
        {
            Console.WriteLine("\nRestoring state --\n");
            this.Name = memento.Name;
            this.Phone = memento.Phone;
            this.Budget = memento.Budget;
        }
    }

    // "Memento" 

    class Memento
    {
        private string name;
        private string phone;
        private double budget;

        // Constructor 
        public Memento(string name, string phone, double budget)
        {
            this.name = name;
            this.phone = phone;
            this.budget = budget;
        }

        // Properties 
        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public string Phone
        {
            get { return phone; }
            set { phone = value; }
        }

        public double Budget
        {
            get { return budget; }
            set { budget = value; }
        }
    }

    // "Caretaker" 

    class ProspectMemory
    {
        private Memento memento;

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