public void RestoreMemento(ContactMemento memento)
{
if (memento != null)
{
this.ContactPersons = memento.ContactPersonBack;
}
}
/// <summary>
/// 备忘录模式
/// </summary>
public static void DoMementoPattern()
{
List <ContactPerson> persons = new List <ContactPerson>()
{
new ContactPerson()
{
Name = "Learning Hard", MobileNum = "123445"
},
new ContactPerson()
{
Name = "Tony", MobileNum = "234565"
},
new ContactPerson()
{
Name = "Jock", MobileNum = "231455"
}
};
MobileOwner mobileOwner = new MobileOwner(persons);
mobileOwner.Show();
// 创建备忘录并保存备忘录对象
Caretaker caretaker = new Caretaker();
caretaker.ContactMementoDic.Add(DateTime.Now.ToString(), mobileOwner.CreateMemento());
// 更改发起人联系人列表
Console.WriteLine("----移除最后一个联系人--------");
mobileOwner.ContactPersons.RemoveAt(2);
mobileOwner.Show();
// 创建第二个备份
Thread.Sleep(1000);
caretaker.ContactMementoDic.Add(DateTime.Now.ToString(), mobileOwner.CreateMemento());
// 恢复到原始状态
Console.WriteLine("-------恢复联系人列表,请从以下列表选择恢复的日期------");
var keyCollection = caretaker.ContactMementoDic.Keys;
foreach (string k in keyCollection)
{
Console.WriteLine("Key = {0}", k);
}
while (true)
{
Console.Write("请输入数字,按窗口的关闭键退出:");
int index = -1;
try
{
index = Int32.Parse(Console.ReadLine());
}
catch
{
Console.WriteLine("输入的格式错误");
continue;
}
ContactMemento contactMentor = null;
if (index < keyCollection.Count &&
caretaker.ContactMementoDic.TryGetValue(keyCollection.ElementAt(index), out contactMentor))
{
mobileOwner.RestoreMemento(contactMentor);
mobileOwner.Show();
}
else
{
Console.WriteLine("输入的索引大于集合长度！");
}
}
}
