.netlistviewvirtualmode

Is WinForms ListView in VirtualMode limited to 100,000,000 rows?

I have some grid scenario with > 500,000,000 rows I would like to display in ListView.

If I artificially limit my ListView to display 100,000,000:

 _listView.VirtualListSize = _data.Count;
 if (_listView.VirtualListSize > 100000000)
   _listView.VirtualListSize = 100000000;

Everything works fine (In VirtualMode naturally). When I change my code to:

 _listView.VirtualListSize = _data.Count;
 if (_listView.VirtualListSize > 100000001)
   _listView.VirtualListSize = 100000001;

The ListView display an empty grid... Is this a Microsoft Bug? Where is this coming from? Is this a Win32 ListView limitation? Most importantly, why is this not documented?

Solution

  • It can't be done. As you have found, 100,000,000 is the absolute limit. MS never documented it (AFAIK), but the limit has been known for a long time: an answer from 2004.

    On previous versions of Windows, trying more than 100,000,000 crashed the OS :)

    On my XP and Vista machines, trying more than 100,000,000 rows limits the size to 9,999,999.