public override void Dispose()
{
if (_enumerator != null)
{
_enumerator.Dispose();
_enumerator = null;
_set = null;
}
base.Dispose();
}
private NewSet <TSource> FillSet()
{
NewSet <TSource> set;
if (_source is ICollection <TSource> src)
{
set = new NewSet <TSource>(_comparer, src.Count);
}
else
{
set = new NewSet <TSource>(_comparer);
}
set.UnionWith(_source);
return(set);
}
public override bool MoveNext()
{
switch (_state)
{
case 1:
_enumerator = _source.GetEnumerator();
if (!_enumerator.MoveNext())
{
Dispose();
return(false);
}
TSource element = _enumerator.Current;
_set = new NewSet <TSource>(_comparer);
_set.Add(element);
_current = element;
_state = 2;
return(true);
case 2:
Debug.Assert(_enumerator != null);
Debug.Assert(_set != null);
while (_enumerator.MoveNext())
{
element = _enumerator.Current;
if (_set.Add(element))
{
_current = element;
return(true);
}
}
break;
}
Dispose();
return(false);
}