CSharp: Command Pattern in donet 6

 

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1;   /// <summary> /// 股票 /// </summary> public class Stock {       /// <summary>     /// 名称     /// </summary>     private readonly string _name;       /// <summary>     /// 数量     /// </summary>     private readonly int _quantity;     /// <summary>     ///     /// </summary>     /// <param name="name"></param>     /// <param name="quantity"></param>     public Stock(string name, int quantity)     {         _name = name;         _quantity = quantity;     }     /// <summary>     /// 买     /// </summary>     public void Buy() => Console.WriteLine($"股票 [ 名称: {_name}, 数量: {_quantity} ] 是买入.");     /// <summary>     /// 卖     /// </summary>     public void Sell() => Console.WriteLine($"股票 [ 名称: {_name}, 数量: {_quantity} ] 是卖出."); }       using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1; /// <summary> /// 经纪人 /// </summary> public class Broker {       /// <summary>     ///     /// </summary>     private readonly List<IOrderCommand> _orders = new();     /// <summary>     ///     /// </summary>     /// <param name="order"></param>     public void TakeOrder(IOrderCommand order) => _orders.Add(order);     /// <summary>     ///     /// </summary>     public void ProcessOrders()     {         foreach (var order in _orders)         {             order.Execute();         }           _orders.Clear();     } }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1;   /// <summary> /// /// </summary> public interface IOrderCommand {       /// <summary>     /// 处理     /// </summary>     void Execute(); }     using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1;   /// <summary> /// 买 /// </summary> public class BuyStockCommand : IOrderCommand {       /// <summary>     ///     /// </summary>     private readonly Stock _stock;       /// <summary>     ///     /// </summary>     /// <param name="stock"></param>     public BuyStockCommand(Stock stock)     {         _stock = stock;     }     /// <summary>     ///     /// </summary>     public void Execute() => _stock.Buy(); }   using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1;   /// <summary> /// 卖 /// </summary> public class SellStockCommand : IOrderCommand {       /// <summary>     ///     /// </summary>     private readonly Stock _stock;     /// <summary>     ///     /// </summary>     /// <param name="stock"></param>     public SellStockCommand(Stock stock)     {         _stock = stock;     }     /// <summary>     ///     /// </summary>     public void Execute() => _stock.Sell(); }     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1;   /// <summary> /// /// </summary> public static class StockExecutor {       /// <summary>     /// Command Pattern     /// geovindu,Geovin Du，涂聚文     ///     /// </summary>     public static void Execute()     {                              ConsoleExtension.WriteSeparator("股票 DEMO");         //         var stock = new Stock("GeovinDu 股票", 1285);         //         var buyStock = new BuyStockCommand(stock);         var sellStock = new SellStockCommand(stock);           var broker = new Broker();         broker.TakeOrder(buyStock);         broker.TakeOrder(sellStock);           broker.ProcessOrders();     } }   using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp1;   /// <summary> /// /// </summary> public static class ConsoleExtension {       /// <summary>     /// 显标题     /// </summary>     /// <param name="title"></param>     public static void WriteSeparator(string title)     {         Console.WriteLine();         Console.WriteLine(title);         Console.WriteLine("--------------------------------------------------");     } }

　　

调用：

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using ConsoleApp1;     // See https://aka.ms/new-console-template for more information Console.WriteLine("Hello, geovindu!"); // StockExecutor.Execute();

　　

输出：

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Hello, geovindu!   股票 DEMO -------------------------------------------------- 股票 [ 名称: GeovinDu 股票, 数量: 1285 ] 是买入. 股票 [ 名称: GeovinDu 股票, 数量: 1285 ] 是卖出.