public override bool TryNext()
{
switch (state)
{
case State.Reset:
while (query1.TryNext())
{
query2.Reset();
if (query2.TryNext())
{
state = State.InProgress;
return(true);
}
}
state = State.Exhausted;
return(false);
case State.InProgress:
do
{
if (query2.TryNext())
{
return(true);
}
query2.Reset();
}while (query1.TryNext());
state = State.Exhausted;
return(false);
case State.Exhausted:
return(false);
}
return(false);
}
public override void Reset()
{
query1.Reset();
state = State.Reset;
}