Design-Pattern/MementoPattern/Program.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace MementoPattern
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("======备忘录模式======");

            List<ContactPerson> persons = new List<ContactPerson>()
            {
                new ContactPerson("张三","13513757890"),
                new ContactPerson("李四","18563252369"),
                new ContactPerson("王二","17825635486"),
            };

            Mobile mobile = new Mobile(persons);

            mobile.DisplayPhoneBook();

            //备份通讯录
            Console.WriteLine("===通讯录已备份===");
            Caretaker caretaker = new Caretaker();
            string key = DateTime.Now.ToString(CultureInfo.InvariantCulture);
            caretaker.ContactMementoes.Add(DateTime.Now.ToString(CultureInfo.InvariantCulture), mobile.CreateMemento());
            Console.WriteLine($"==={key}：通讯录已备份===");

            //移除第一个联系人
            Console.WriteLine("----移除联系人----");
            mobile.GetPhoneBook().RemoveAt(0);
            mobile.DisplayPhoneBook();

            Thread.Sleep(2000);
            string key2 = DateTime.Now.ToString(CultureInfo.InvariantCulture);
            caretaker.ContactMementoes.Add(DateTime.Now.ToString(CultureInfo.InvariantCulture), mobile.CreateMemento());
            Console.WriteLine($"==={key2}：通讯录已备份===");

            //再移除一个联系人
            Console.WriteLine("----移除联系人----");
            mobile.GetPhoneBook().RemoveAt(0);
            mobile.DisplayPhoneBook();

            //恢复通讯录
            Console.WriteLine($"----恢复到最后一次通讯录备份：{caretaker.ContactMementoes.LastOrDefault().Key}----");
            mobile.RestoreMemento(caretaker.ContactMementoes.LastOrDefault().Value);

            mobile.DisplayPhoneBook();

            Console.ReadLine();

        }
    }
}