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

StackOverflow https://stackoverflow.com/questions/2454942

  •  20-09-2019
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Question

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?

Was it helpful?

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.

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