public void RestoreMemento(ContactMemento memento)
{
if (memento != null)
{
this.ContactPersons = memento.ContactPersonsBack;
}
}
/// <summary>
/// 下面以备份手机通讯录为例子来实现了备忘录模
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
List <ContactPerson> persons = new List <ContactPerson>()
{
new ContactPerson()
{
Name = "Learning Hard", MobileNum = "123456"
},
new ContactPerson()
{
Name = "Tony", MobileNum = "10086"
},
new ContactPerson()
{
Name = "Jock", MobileNum = "10010"
}
};
//将联系人列表存储到List
MobileOwner mobileOwner = new MobileOwner(persons);
//展示List
mobileOwner.Show();
//实例化备份类
Caretaker caretaker = new Caretaker();
//进行备份
caretaker.ContactMementoDis.Add(DateTime.Now.ToString(), mobileOwner.CreateMemento());
Console.WriteLine("-----------移除最好一个联系人------------");
//开始移除
mobileOwner.ContactPersons.RemoveAt(2);//移除的索引
//显示
mobileOwner.Show();
//创建第二个备份
Thread.Sleep(1000);
caretaker.ContactMementoDis.Add(DateTime.Now.ToString(), mobileOwner.CreateMemento());
//给予恢复选择
Console.WriteLine("--------恢复联系人列表，请从下列表选择恢复的日期------");
var keyCollection = caretaker.ContactMementoDis.Keys;
int i = -1;
foreach (var k in keyCollection)
{
Console.WriteLine($"Key={k} 选择索引为： {++i}");
}
while (true)
{
Console.Write("请输入数字，按窗口的关闭键退出。。。");
int index = -1;
try
{
//获取输入的值
index = Int32.Parse(Console.ReadLine());
}
catch (Exception e)
{
Console.WriteLine("输入的格式错误");
continue;
}
ContactMemento contactMementor = null;
if (index < keyCollection.Count && caretaker.ContactMementoDis.TryGetValue(keyCollection.ElementAt(index), out contactMementor))
{
mobileOwner.RestoreMemento(contactMementor);
mobileOwner.Show();
}
else
{
Console.WriteLine("输入的索引大于集合的长度！");
}
}
}