public void Entry(string vh_id)
{
if (CurrentVhs.TryAdd(vh_id, vh_id))
{
onSectinoEntry(vh_id);
}
}
public void Leave(string vh_id)
{
string vVh_id = string.Empty;
if (CurrentVhs.TryRemove(vh_id, out vVh_id))
{
onSectinoLeave(vh_id);
}
}