CSharp: Memento Pattern in donet core 6

 

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using Geovin.Du.DuMemento.Conceptual; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuMemento.FoodSupplier {       /// <summary>     /// 备忘录模式 Memento Pattern亦称： 快照、Snapshot、Memento     /// </summary>     public class FoodSupplier     {           /// <summary>         ///         /// </summary>         private string _name = string.Empty;         /// <summary>         ///         /// </summary>         private string _phone = string.Empty;         /// <summary>         ///         /// </summary>         private string _address = string.Empty;         /// <summary>         ///         /// </summary>         public string Name         {             get => _name;             set             {                 _name = value;                 Console.WriteLine($"食品供应商:名称设置为 {_name}");             }         }         /// <summary>         ///         /// </summary>         public string Phone         {             get => _phone;             set             {                 _phone = value;                 Console.WriteLine($"食品供应商:电话号码设置为 {_phone}");             }         }         /// <summary>         ///         /// </summary>         public string Address         {             get => _address;             set             {                 _address = value;                 Console.WriteLine($"食品供应商:地址设置为{_address}");             }         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public override string ToString()         {             return $"姓名：{Name} 电话：{Phone} 地址:{ Address}";         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public IMemento Save()         {             Console.WriteLine("\n食品供应商:保存现状...");             return new FoodSupplierMemento(_name, _phone, _address);         }           /// <summary>         /// Restore previous state.         /// Note that the method returns an IMemento instance in order to to facilitate redo operation.         /// The return type can be changed to void if redo doesn't have to be supported.         /// </summary>         /// <param name="memento">Memento for restoration.</param>         /// <returns>Redo memento.</returns>         public IMemento Restore(IMemento memento)         {             Console.WriteLine("\n食品供应商:恢复状态...");               if (memento is not FoodSupplierMemento foodSupplierMemento)             {                 throw new ArgumentException($"未知的纪念品: {memento}");             }               var redoMemento = new FoodSupplierMemento(_name, _phone, _address);               Name = foodSupplierMemento.Name;             Phone = foodSupplierMemento.PhoneNumber;             Address = foodSupplierMemento.Address;               return redoMemento;         }     }   }     using Geovin.Du.DuMemento.Conceptual; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuMemento.FoodSupplier {       /// <summary>     /// 备忘录模式 Memento Pattern亦称： 快照、Snapshot、Memento     /// </summary>     public class SupplierRegistry     {           /// <summary>         ///         /// </summary>         private readonly FoodSupplier _supplier;         /// <summary>         ///         /// </summary>         private readonly Stack<IMemento> _undoStack;         /// <summary>         ///         /// </summary>         private readonly Stack<IMemento> _redoStack;         /// <summary>         ///         /// </summary>         /// <param name="supplier"></param>         public SupplierRegistry(FoodSupplier supplier)         {             _supplier = supplier;             _undoStack = new Stack<IMemento>();             _redoStack = new Stack<IMemento>();         }         /// <summary>         ///         /// </summary>         public void Backup()         {             Console.WriteLine("\n供应商注册表:备份操作..");               _redoStack.Clear();             _undoStack.Push(_supplier.Save());         }         /// <summary>         ///         /// </summary>         public void Undo()         {             Console.WriteLine("\n供应商注册表:正在执行撤销操作...");               var top = _undoStack.Pop();             _redoStack.Push(_supplier.Restore(top));         }         /// <summary>         ///         /// </summary>         public void Redo()         {             Console.WriteLine("\n供应商注册表:执行重做操作...");               var top = _redoStack.Pop();             _undoStack.Push(_supplier.Restore(top));         }     } }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuMemento.FoodSupplier {       /// <summary>     /// 备忘录模式 Memento Pattern亦称： 快照、Snapshot、Memento     /// </summary>     public interface IMemento     {     } }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace Geovin.Du.DuMemento.FoodSupplier {       /// <summary>     /// 备忘录模式 Memento Pattern亦称： 快照、Snapshot、Memento     /// </summary>     public class FoodSupplierMemento : IMemento     {           /// <summary>         ///         /// </summary>         /// <param name="name"></param>         /// <param name="phoneNumber"></param>         /// <param name="address"></param>         public FoodSupplierMemento(string name, string phoneNumber, string address)         {             Name = name;             PhoneNumber = phoneNumber;             Address = address;         }         /// <summary>         ///         /// </summary>         public string Name { get; set; }           /// <summary>         /// /         /// </summary>         public string PhoneNumber { get; set; }         /// <summary>         ///         /// </summary>         public string Address { get; set; }     }   }   using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Geovin.Du.BuildingBlocks;     namespace Geovin.Du.DuMemento.FoodSupplier {       /// <summary>     /// 备忘录模式 Memento Pattern亦称： 快照、Snapshot、Memento     /// </summary>     public static class FoodSupplierExecutor     {             /// <summary>         ///         /// </summary>         public static void Execute()         {             ConsoleExtension.WriteSeparator("\n备忘录模式 Memento Pattern 食物供应 Food supplier demo");               var foodSupplier = new FoodSupplier             {                 Name = "涂氏食品工业公司",                 Phone = "8888 1111",                 Address = "深圳市罗湖区",             };               var registry = new SupplierRegistry(foodSupplier);             registry.Backup();               foodSupplier.Phone = "8888 2222";               registry.Undo();             registry.Redo();         }     } }

　　

 

调用：

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1	Geovin.Du.DuMemento.FoodSupplier.FoodSupplierExecutor.Execute();

　　

输出：

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备忘录模式 Memento Pattern 食物供应 Food supplier demo -------------------------------------------------- 食品供应商:名称设置为 涂氏食品工业公司 食品供应商:电话号码设置为 8888 1111 食品供应商:地址设置为深圳市罗湖区   供应商注册表:备份操作..   食品供应商:保存现状... 食品供应商:电话号码设置为 8888 2222   供应商注册表:正在执行撤销操作...   食品供应商:恢复状态... 食品供应商:名称设置为 涂氏食品工业公司 食品供应商:电话号码设置为 8888 1111 食品供应商:地址设置为深圳市罗湖区   供应商注册表:执行重做操作...   食品供应商:恢复状态... 食品供应商:名称设置为 涂氏食品工业公司 食品供应商:电话号码设置为 8888 2222 食品供应商:地址设置为深圳市罗湖区