public void DetachTag( Tag t )
{
Tag removedItem;
var removed = Tags.TryRemove( t.Id, out removedItem );
if (removed) TagLeave( this, new TagEventArgs( removedItem ) );
}
public TagEventArgs( Tag tag )
{
Tag = tag;
}
public void AttachTag( Tag t )
{
var added = Tags.TryAdd( t.Id, t );
if (added) TagEnter( this, new TagEventArgs( t ) );
}