C＃列表框项目的颜色续

Question

I'm trying to find a way to highlight the background of list box items with different colors, and came across this four year old closed thread that almost answers the question here:

Background color of a ListBox item (winforms)

I'm not following how to use his method. So if I created an object named listBox1 and a string variable named strSomeString, what would be the exact code for adding strSomeString to listBox1 with a red background?

Using Shadow Wizard's code here:

    private void lbReports_DrawItem(object sender, DrawItemEventArgs e)
    {
        e.DrawBackground();

        bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected);

        int index = e.Index;
        if (index >= 0 && index < lbReports.Items.Count)
        {
            string text = lbReports.Items[index].ToString();
            Graphics g = e.Graphics;

            Color color = (selected) ? Color.FromKnownColor(KnownColor.Highlight) : (((index % 2) == 0) ? Color.White : Color.Gray);
            g.FillRectangle(new SolidBrush(color), e.Bounds);

            // Print text
            g.DrawString(text, e.Font, (selected) ? reportsForegroundBrushSelected : reportsForegroundBrush, 
                lbReports.GetItemRectangle(index).Location);
        }

        e.DrawFocusRectangle();
    }

-Thanks

Answer 1

Consider using an owner draw control for this.

It's more work because you need to render all the list contents. But you'll have total flexibility.

Answer 2

You just need to hook the Draw_item event of the listbox to lbReports_DrawItem handler. You can do that by set it at the properties of the listbox.

Another thing is to Set the DrawMode to OwnerDrawFixed