Very slow updating Listview.Items(x).SubItems(y).Text

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hello

I have a listview control which contains a number of rows of data, probably just less than a hundred. There are approx. 10 columns, no sorting, control set to show data in Detail mode

I want to update just 3 columns, but for all items, as quickly as possible..

The problem is, that when I update the contents of a cell, I can watch the whole line being painted... needless to say, the whole routine is incredibly slow. I am seeing 30 cell updates taking about a second to complete, and there's nothing complicated going on, it just appears to be that the listview control is very slow. I have reduced the updates so that only cells whose value has changed get updated only, but still, with just a dozen updates, the time to do the updates is very slow and the CPU time seems to get quite busy... anywhere from 60-80%... and like I say, it seems to be the Listview that is the culprit

Does anybody know of a way of avoiding accomplishing these data update rates without a flickering screen or expensive CPU time? I would really appreciate any help. Thank you.
 
Use BeginUpdate() and EndUpdate() before and after the update code.

Regards,
Aaron Queenan.

Nate said:
Hello,

I have a listview control which contains a number of rows of data,
Click to expand...
probably just less than a hundred. There are approx. 10 columns, no sorting,
control set to show data in Detail mode.
I want to update just 3 columns, but for all items, as quickly as possible...

The problem is, that when I update the contents of a cell, I can watch the
Click to expand...
whole line being painted... needless to say, the whole routine is incredibly
slow. I am seeing 30 cell updates taking about a second to complete, and
there's nothing complicated going on, it just appears to be that the
listview control is very slow. I have reduced the updates so that only cells
whose value has changed get updated only, but still, with just a dozen
updates, the time to do the updates is very slow and the CPU time seems to
get quite busy... anywhere from 60-80%... and like I say, it seems to be the
Listview that is the culprit.
Does anybody know of a way of avoiding accomplishing these data update
Click to expand...
rates without a flickering screen or expensive CPU time? I would really
appreciate any help. Thank you.
 
Back
Top