数组的事件处理程序

Question

我是否有任何基于编译语言的array事件处理程序，事件监听器，动作监听器或类似的东西（例如Java，c ++，c）？

我正在寻找跟踪array更改的方法。因此，当一个单元格的值发生变化时，监听器会通知我这个变化以及发生这种变化的单元格数。

这个问题是否有任何语言或任何选项？

Answer 1

修改

如果您不想使用自定义类型，可以查看此实现以观察何时更改数组：http://www.codeproject.com/Articles/162966/Observing-Changes-to-an-Underlying-Array

以下是Microsoft在C＃中使用ArrayList

执行所需操作的示例

http://msdn.microsoft.com/en-us/library/aa645739(v=vs.71).aspx

// events1.cs
using System;
namespace MyCollections 
{
   using System.Collections;

   // A delegate type for hooking up change notifications.
   public delegate void ChangedEventHandler(object sender, EventArgs e);

   // A class that works just like ArrayList, but sends event
   // notifications whenever the list changes.
   public class ListWithChangedEvent: ArrayList 
   {
      // An event that clients can use to be notified whenever the
      // elements of the list change.
      public event ChangedEventHandler Changed;

      // Invoke the Changed event; called whenever list changes
      protected virtual void OnChanged(EventArgs e) 
      {
         if (Changed != null)
            Changed(this, e);
      }

      // Override some of the methods that can change the list;
      // invoke event after each
      public override int Add(object value) 
      {
         int i = base.Add(value);
         OnChanged(EventArgs.Empty);
         return i;
      }

      public override void Clear() 
      {
         base.Clear();
         OnChanged(EventArgs.Empty);
      }

      public override object this[int index] 
      {
         set 
         {
            base[index] = value;
            OnChanged(EventArgs.Empty);
         }
      }
   }
}

namespace TestEvents 
{
   using MyCollections;

   class EventListener 
   {
      private ListWithChangedEvent List;

      public EventListener(ListWithChangedEvent list) 
      {
         List = list;
         // Add "ListChanged" to the Changed event on "List".
         List.Changed += new ChangedEventHandler(ListChanged);
      }

      // This will be called whenever the list changes.
      private void ListChanged(object sender, EventArgs e) 
      {
         Console.WriteLine("This is called when the event fires.");
      }

      public void Detach() 
      {
         // Detach the event and delete the list
         List.Changed -= new ChangedEventHandler(ListChanged);
         List = null;
      }
   }

   class Test 
   {
      // Test the ListWithChangedEvent class.
      public static void Main() 
      {
      // Create a new list.
      ListWithChangedEvent list = new ListWithChangedEvent();

      // Create a class that listens to the list's change event.
      EventListener listener = new EventListener(list);

      // Add and remove items from the list.
      list.Add("item 1");
      list.Clear();
      listener.Detach();
      }
   }
}