public bool Add(T key)
{
bool added = _items.Add(key);
if (added)
{
AfterKeyAdded?.Invoke(this, new KeyEventArg <T>(key));
}
return(added);
}
public TI this[TK key]
{
get
{
return(_items[key]);
}
set
{
if (!_items.ContainsKey(key) && !_items.ContainsValue((T)value))
{
_items[key] = (T)value;
value.PropertyChanged += Value_PropertyChanged;
AfterKeyAdded?.Invoke(this, new KeyEventArg <TK>(key));
}
}
}