c# - Listview flickers when I update it with a timer

Question

I would like to update some or all of my listview's items and subitems contents with a timer (1 second refresh) But the listview flicker each one second. Sometimes the subitems are lost during redrawing. Because my listview contains data that is to be likely changed anytime, I use a timer.

Code: I put this function in the timer's Tick method

void Refresh()
{
   foreach(string s in lsttring)
   {
      lv.items.add(s);
      lv.items[i].subitems.add(i);
   }
}

I expect only items content (item text and subitem text) that are changed will be changed not the whole listview along with the timer tick.

Answer 1

The ListView control supports double buffering, it maps the DoubleBuffered property to the native control's LVS_EX_DOUBLEBUFFER style flag. It is quite effective but you can't get to it directly since it is a protected property. Add a new class to your project and paste the code shown below. Compile. Drop the new control from the top of the toolbox onto your form, replacing the old one.

using System;
using System.Windows.Forms;

class BufferedListView : ListView {
    public BufferedListView() {
        this.DoubleBuffered = true;
    }
}