private IEnumerator <T> GetEnumerator_()
{
var i = 0;
try
{
while (true)
{
if (_disposed)
{
throw new ObjectDisposedException("");
}
var hasValue = default(bool);
var current = default(T) !;
lock (_gate)
{
if (i >= _buffer.Count)
{
if (!_stopped)
{
try
{
hasValue = _source.MoveNext();
if (hasValue)
{
current = _source.Current;
}
}
catch (Exception ex)
{
_stopped = true;
_error = ex;
_source.Dispose();
}
}
if (_stopped)
{
if (_error != null)
{
throw _error;
}
else
{
break;
}
}
if (hasValue)
{
_buffer.Add(current);
}
}
else
{
hasValue = true;
}
}
if (hasValue)
{
yield return(_buffer[i]);
}
else
{
break;
}
i++;
}
}
finally
{
if (_buffer != null)
{
_buffer.Done(i + 1);
}
}
}
