GMap.NET.WindowsForms/GMap.NET.ObjectModel/ObservableCollection.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;

namespace GMap.NET.ObjectModel
{
   public delegate void NotifyCollectionChangedEventHandler(object sender, NotifyCollectionChangedEventArgs e);

   public interface INotifyCollectionChanged
   {
      // Events
      event NotifyCollectionChangedEventHandler CollectionChanged;
   }

   public interface INotifyPropertyChanged
   {
      // Events
      event PropertyChangedEventHandler PropertyChanged;
   }

   public enum NotifyCollectionChangedAction
   {
      Add,
      Remove,
      Replace,
      Move,
      Reset
   }

   public class NotifyCollectionChangedEventArgs : EventArgs
   {
      // Fields
      private NotifyCollectionChangedAction _action;
      private IList _newItems;
      private int _newStartingIndex;
      private IList _oldItems;
      private int _oldStartingIndex;

      // Methods
      public NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction action)
      {
         this._newStartingIndex = -1;
         this._oldStartingIndex = -1;
         if(action != NotifyCollectionChangedAction.Reset)
         {
            throw new ArgumentException("WrongActionForCtor", "action");
         }
         this.InitializeAdd(action, null, -1);
      }

      public NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction action, IList changedItems)
      {
         this._newStartingIndex = -1;
         this._oldStartingIndex = -1;
         if(((action != NotifyCollectionChangedAction.Add) && (action != NotifyCollectionChangedAction.Remove)) && (action != NotifyCollectionChangedAction.Reset))
         {
            throw new ArgumentException("MustBeResetAddOrRemoveActionForCtor", "action");
         }