网站婚庆模板,网站排名提升易下拉教程,wordpress如何登录界面,网页设计图片居中前言 命令模式的关键通过将请求封装成一个对象#xff0c;使命令的发送者和接收者解耦。这种方式能更方便地添加新的命令#xff0c;如执行命令的排队、延迟、撤销和重做等操作。 代码
#region 基础的命令模式
//命令#xff08;抽象类#xff09;
public abstract class …前言 命令模式的关键通过将请求封装成一个对象使命令的发送者和接收者解耦。这种方式能更方便地添加新的命令如执行命令的排队、延迟、撤销和重做等操作。 代码
#region 基础的命令模式
//命令抽象类
public abstract class Command
{public abstract void Execute();
}
//发送命令
public class SendCommand : Command
{private Receiver receiver;public SendCommand(Receiver receiver){this.receiver receiver;}public override void Execute(){receiver.Execute();}
}
//接收命令
public class Receiver
{public void Execute(){Console.WriteLine(receiver execute the command...);}
}
//调用者命令
public class Invoker
{private Command command;public void SetCommand(Command command){this.command command;}public void ExecuteCommand(){command.Execute();}
}
#endregion#region 添加新的命令模式
//新命令
public class NewCommand : Command
{private NewReceiver newReceiver;public NewCommand(NewReceiver newReceiver){this.newReceiver newReceiver;}public override void Execute(){newReceiver.Execute();}
}
//使用新接收者
public class NewReceiver
{public void Execute(){Console.WriteLine(new reveiver execute the newCommand...);}
}#endregion#region 命令的请求的排队和延迟执行
//命令执行者
public class CommandInvoker
{private ListCommand commandQueue new ListCommand();public void AddCommand(Command command){commandQueue.Add(command);}public void ExecuteCommands(){foreach (Command command in commandQueue){command.Execute();}commandQueue.Clear();}public void DelayExecute(Command command,int delay){Console.WriteLine($等待开始....时间{delay}ms);new Thread(() {Console.WriteLine($延时执行开始);Thread.Sleep(delay);command.Execute();Console.WriteLine($finish time:{Environment.NewLine}{DateTime.Now.ToString(HH:mm:ss fff)});Console.WriteLine($延时执行完毕...);}).Start();}
}
#endregion#region 命令撤销和重做操作
public interface ICommand
{void Execute();void Undo();
}public class HistoryCommand : ICommand
{private HistoryReceiver historyReceiver;public HistoryCommand(HistoryReceiver historyReceiver){this.historyReceiver historyReceiver;}public void Execute(){historyReceiver.Execute();}public void Undo(){historyReceiver.UndoExecute();}
}public class HistoryReceiver
{public void Execute(){Console.WriteLine(history receiver executes the command...);}public void UndoExecute(){Console.WriteLine(history receiver undoes the command...);}
}
public class HistoryInvoker
{private StackICommand commandStack new StackICommand();public void ExecuteCommand(ICommand command){command.Execute();commandStack.Push(command);}public void Undo(){if (commandStack.Count 0){ICommand command commandStack.Pop();Console.WriteLine(command Undo);command.Undo();}else{Console.WriteLine(No commands to undo.);}}public void Redo(){if (commandStack.Count0){ICommand command commandStack.Peek();Console.WriteLine(command Redo);command.Execute();}else{Console.WriteLine(No commands to redo.);}}
}/** 行为型模式Behavioral Pattern* 命令模型Command Pattern*/internal class Program{static void Main(string[] args){//命令模式简单实现Receiver receiver new Receiver();Command sendCommand new SendCommand(receiver);Invoker invoker new Invoker();invoker.SetCommand(sendCommand);invoker.ExecuteCommand();Console.WriteLine(添加新命令------------------------------------);// 命令模式添加新命令NewReceiver newReceiver new NewReceiver();Command newCommand new NewCommand(newReceiver);invoker.SetCommand(newCommand);invoker.ExecuteCommand();Console.WriteLine(请求队列------------------------------------);//命令模式请求队列Receiver receiver1 new Receiver();Command command1 new SendCommand(receiver1);Command command2 new SendCommand(receiver1);CommandInvoker commandInvoker new CommandInvoker();commandInvoker.AddCommand(command1);commandInvoker.AddCommand(command2);commandInvoker.ExecuteCommands();Console.WriteLine(延时执行------------------------------------);Console.WriteLine(${DateTime.Now.ToString(HH:mm:ss fff)});//命令模式延时执行commandInvoker.DelayExecute(command1,1000);Console.WriteLine(准备撤销重做------------------------------------);HistoryReceiver historyReceiver new HistoryReceiver();ICommand command3 new HistoryCommand(historyReceiver);ICommand command4 new HistoryCommand(historyReceiver);HistoryInvoker historyInvoker new HistoryInvoker();historyInvoker.ExecuteCommand(command3);historyInvoker.ExecuteCommand(command4);Console.WriteLine(执行撤销重做------------------------------------);//撤销最后一个命令historyInvoker.Undo();historyInvoker.Undo();//重做最后一个撤销命令historyInvoker.Redo();Console.WriteLine(END------------------------------------);Console.ReadLine();}}
#endregion运行结果
