private static void Main(string[] args) { //现在有三个人 List <Man> man = new List <Man>() { new Man() { Name = "小A", Age = 18 }, new Man() { Name = "小B", Age = 19 }, new Man() { Name = "小C", Age = 20 }, }; //女神的记录 MobileOwner mobileOwner = new MobileOwner(man); mobileOwner.Show(); //创建备忘录 ContactMemento ConM = mobileOwner.CreateMemento(); //删除女神的记录 mobileOwner.manList.RemoveRange(0, 3); mobileOwner.Show(); //恢复女神的记录 mobileOwner.RestoreMemeoto(ConM); mobileOwner.Show(); Console.ReadLine(); }
// 将备忘录中的数据备份导入到联系人列表中 public void RestoreMemento(ContactMemento memento) { if (memento != null) { // 下面这种方式是错误的,因为这样传递的是引用, // 则删除一次可以恢复,但恢复之后再删除的话就恢复不了. // 所以应该传递contactPersonBack的深拷贝,深拷贝可以使用序列化来完成 this.ContactPersons = memento.ContactPersonBack; } }
//备忘录数据导入 public void RestoreMemeoto(ContactMemento memento) { manList = memento.manList; }
static void Main(string[] args) { 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!"); } } }