private void Walk(object state)
{
try {
if (_items == null)
{
_items = new Queue <DicomItem>();
BuildWalkQueue(_dataset);
_walker.OnBeginWalk(this, NextWalkItem);
}
DicomItem item = null;
while (_items.Count > 0)
{
item = _items.Peek();
if (item is DicomElement)
{
if (!_walker.OnElement(item as DicomElement))
{
return;
}
}
else if (item is DicomFragmentSequence)
{
if (!_walker.OnBeginFragment(item as DicomFragmentSequence))
{
return;
}
}
else if (item is DicomFragmentItem)
{
if (!_walker.OnFragmentItem((item as DicomFragmentItem).Buffer))
{
return;
}
}
else if (item is EndDicomFragment)
{
if (!_walker.OnEndFragment())
{
return;
}
}
else if (item is DicomSequence)
{
if (!_walker.OnBeginSequence(item as DicomSequence))
{
return;
}
}
else if (item is BeginDicomSequenceItem)
{
if (!_walker.OnBeginSequenceItem((item as BeginDicomSequenceItem).Dataset))
{
return;
}
}
else if (item is EndDicomSequenceItem)
{
if (!_walker.OnEndSequenceItem())
{
return;
}
}
else if (item is EndDicomSequence)
{
if (!_walker.OnEndSequence())
{
return;
}
}
_items.Dequeue();
}
_walker.OnEndWalk();
_items = null;
_async.Set();
} catch (Exception e) {
try {
_walker.OnEndWalk();
} catch {
}
_exception = e;
_items = null;
_async.Set();
}
}
