public void Remove(T key, V value)
{
if (BaseMap.TryGetValue(key, out ICollection <V> list))
{
list.Remove(value);
}
}
public void Add(T key, V value)
{
if (!BaseMap.TryGetValue(key, out ICollection <V> list))
{
list = new HashSet <V>();
BaseMap.Add(key, list);
}
list.Add(value);
}
public IEnumerable <V> this[T key]
{
get
{
if (!BaseMap.TryGetValue(key, out ICollection <V> v))
{
return(empty);
}
return(v);
}
}
