class Program
   {
     static void Main(string[] args)
     {
       PetTracker tracker = new PetTracker();
       tracker.InstanceTrack();
       Console.ReadKey();
     }
   }
  
   public class PetTracker
   {
     private int distance;
  
     //适时监控
     public void InstanceTrack()
     {
       for (int i = 0; i < 102; i++)
       {
         distance = i;
         if (distance > 100)
         {
           MakeAlert(distance);
           ShowAlert(distance);
         }
       }
     }
  
     //主人手上的追踪器终端发出警报声
     private void MakeAlert(int param)
     {
       Console.WriteLine("嘀嘀嘀，您的宝贝已经离你" + param + "米之外了，要注意哦~~");
     }
  
     //主人手上的追踪器终端显示报警信息
     private void ShowAlert(int param)
     {
       Console.WriteLine("您的宝贝已经离你" + param + "米之外了，要注意哦~~");
     }
   }

   public class PetTracker
   {
     private int distance;
  
     //适时监控
     public void InstanceTrack()
     {
       for (int i = 0; i < 102; i++)
       {
         distance = i;
         if (distance > 100)
         {
  
         }
       }
     }   
   }
  
   public class MakerAlertSupplier
   {
     //主人手上的追踪器终端发出警报声
     public void MakeAlert(int param)
     {
       Console.WriteLine("嘀嘀嘀，您的宝贝已经离你" + param + "米之外了，要注意哦~~");
     }
   }
  
   public class ShowAlertSupplier
   {
     //主人手上的追踪器终端显示报警信息
     public static void ShowAlert(int param)
     {
       Console.WriteLine("您的宝贝已经离你" + param + "米之外了，要注意哦~~");
     }
   }

   class Program
   {
     static void Main(string[] args)
     {
       PetTracker tracker = new PetTracker();
       tracker.TrackEvent += (new MakerAlertSupplier()).MakeAlert;
       tracker.TrackEvent += ShowAlertSupplier.ShowAlert;
  
       tracker.InstanceTrack();
       Console.ReadKey();
     }
   }
  
   public class PetTracker
   {
     private int distance;
  
     public delegate void TrackHandler(int param); //委托
     public event TrackHandler TrackEvent; //委托类型的事件
  
     //适时监控
     public void InstanceTrack()
     {
       for (int i = 0; i < 102; i++)
       {
         distance = i;
         if (distance > 100)
         {
           if (TrackEvent != null)
           {
             TrackEvent(distance);
           }
         }
       }
     }   
   }
  
   public class MakerAlertSupplier
   {
     //主人手上的追踪器终端发出警报声
     public void MakeAlert(int param)
     {
       Console.WriteLine("嘀嘀嘀，您的宝贝已经离你" + param + "米之外了，要注意哦~~");
     }
   }
  
   public class ShowAlertSupplier
   {
     //主人手上的追踪器终端显示报警信息
     public static void ShowAlert(int param)
     {
       Console.WriteLine("您的宝贝已经离你" + param + "米之外了，要注意哦~~");
     }
   }