public virtual void Add(string key, T item)
{
if (_keys.Contains(key))
{
throw new Exception("Key already exist");
}
_keys.Add(key);
int index = _items.Add(item);
if (ItemAdd != null)
{
ItemAdd(this, new KeyedCollectionAddEventArgs(_items[index], index, _keys[index]));
}
if (CollectionChanged != null)
{
CollectionChanged(this, new EventArgs());
}
}
public virtual bool Contains(T item)
{
return(_items.Contains(item));
}