I have a program that saves the items that the user typed in (because the list can get rather large) to disk. Once the user has selected the item the background turns a color to let the user know that the item has been used (some items can be used more then once which is why I do not remove it completely)

My question is...how can i force a repaint of the control and change the backcolors on the appropriate list items?

1. calling repainInputControl() does not work after opening up the users saved document (if I manually click an item then it repaints correctly)
2. calling lstInput.Refresh() does not work
3. calling lstInput.Invalidate() or .Invalidate(true) doesnt work





private void repaintInputControl()
{
string sAlreadyMapped = "";
string sCurrentItem = "";
int iPos = 0;

if (lstInput.SelectedItems.Count > 0)
{
lstInput.BeginUpdate();
for (int j = 0; j < lstMappedVariables.Items.Count; j++)
{
sAlreadyMapped += lstMappedVariables.Items[j].SubItems[0].Text + ", ";
}

for (int j = 0; j < lstInput.Items.Count; j++)
{
sCurrentItem = lstInput.Items[j].Text;
iPos = sAlreadyMapped.IndexOf(sCurrentItem + ",");
if (iPos > -1)
{
lstInput.Items[j].BackColor = colorAlreadyUsed;
}
else
{
lstInput.Items[j].BackColor = colorNotUsed;
}
}
lstInput.SelectedItems[0].BackColor = colorCurrentlySelected;
}
lstInput.EndUpdate();
}

Hello,

Do you mean when you update something, the ListView's items content should be changed accordingly?

When you call ListView.Refresh method, it does force ListView to repaint. But if you don't change the content of these items, it will remain unchanged.

According to your code, I think "colorAlreadyUsed" is the color represent the used items and "colorNotUsed" represent unused items. After the loop, these item's color have been set. Then the first item of ListView always show "colorCurrentlySelected". Right? You can try to call lstInput.Refresh at the end of repaintInputControl method. Does it work?

Sincerely,
Kira Qian

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