将项目添加到列表控件时，UI被冻结

Question

My app is freeze while I click the button to add items to list control. I'm doing it simple:

for (unsigned i = 1; i < 15000;++i)
{
  listcontrol1.InsertItem(i, L"item list");
}

I also tried using a background thread but the same results. Any idea how to do this correctly without blocking the user interface ?

Answer 1

pouring 15k messages into the message pump is going to be slow.

Better use a virtual list control with proper caching. See the VListVW Sample in %Windows SDK Dir%\\Samples\\winui\\controls\\common\\vlistvw for working code.

Answer 2

As Sheng Jiang stated the virtual list is the best solution for such a great list. But you can improve the performance avoiding control paintings during insertion:

listcontrol1.SetRedraw(FALSE);
for (unsigned i = 1; i < 15000; ++i)
{
    listcontrol1.InsertItem(i, L"item list");
}
listcontrol1.SetRedraw(TRUE);