public override bool MoveNext()
{
switch (_state)
{
case 1:
_node = _prepended;
_state = 2;
goto case 2;
case 2:
if (_node != null)
{
_current = _node.Item;
_node = _node.Linked;
return(true);
}
GetSourceEnumerator();
_state = 3;
goto case 3;
case 3:
if (LoadFromEnumerator())
{
return(true);
}
if (_appended == null)
{
return(false);
}
_enumerator = _appended.GetEnumerator();
_state = 4;
goto case 4;
case 4:
return(LoadFromEnumerator());
}
Dispose();
return(false);
}
protected override async ValueTask <bool> MoveNextCore()
{
switch (_state)
{
case AsyncIteratorState.Allocated:
_mode = 1;
_state = AsyncIteratorState.Iterating;
goto case AsyncIteratorState.Iterating;
case AsyncIteratorState.Iterating:
switch (_mode)
{
case 1:
_node = _prepended;
_mode = 2;
goto case 2;
case 2:
if (_node != null)
{
_current = _node.Item;
_node = _node.Linked;
return(true);
}
GetSourceEnumerator(_cancellationToken);
_mode = 3;
goto case 3;
case 3:
if (await LoadFromEnumeratorAsync().ConfigureAwait(false))
{
return(true);
}
if (_appended != null)
{
_appendedEnumerator = _appended.GetEnumerator(_appendCount);
_mode = 4;
goto case 4;
}
break;
case 4:
if (_appendedEnumerator.MoveNext())
{
_current = _appendedEnumerator.Current;
return(true);
}
break;
}
break;
}
await DisposeAsync().ConfigureAwait(false);
return(false);
}
protected override async Task <bool> MoveNextCore(CancellationToken cancellationToken)
{
switch (state)
{
case AsyncIteratorState.Allocated:
mode = 1;
state = AsyncIteratorState.Iterating;
goto case AsyncIteratorState.Iterating;
case AsyncIteratorState.Iterating:
switch (mode)
{
case 1:
node = prepended;
mode = 2;
goto case 2;
case 2:
if (node != null)
{
current = node.Item;
node = node.Linked;
return(true);
}
GetSourceEnumerator();
mode = 3;
goto case 3;
case 3:
if (await LoadFromEnumerator(cancellationToken)
.ConfigureAwait(false))
{
return(true);
}
if (appended != null)
{
appendedEnumerator = appended.GetEnumerator();
mode = 4;
goto case 4;
}
break;
case 4:
if (appendedEnumerator.MoveNext())
{
current = appendedEnumerator.Current;
return(true);
}
break;
}
break;
}
Dispose();
return(false);
}
