如何更改ListBox选择背景颜色？

Question

它似乎使用Windows设置中的默认颜色,默认为蓝色.假设我想将其永久更改为红色.我正在使用Winforms.

提前致谢.

Answer 1

您必须覆盖该Drawitem事件并将DrawMode属性设置为DrawMode.OwnerDrawFixed

检查这个样本

private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
    if (e.Index<0) return;
    //if the item state is selected them change the back color 
    if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
        e = new DrawItemEventArgs(e.Graphics, 
                                  e.Font, 
                                  e.Bounds, 
                                  e.Index,
                                  e.State ^ DrawItemState.Selected,
                                  e.ForeColor, 
                                  Color.Yellow);//Choose the color

    // Draw the background of the ListBox control for each item.
    e.DrawBackground();
    // Draw the current item text
    e.Graphics.DrawString(listBox1.Items[e.Index].ToString(),e.Font, Brushes.Black, e.Bounds, StringFormat.GenericDefault);
    // If the ListBox has focus, draw a focus rectangle around the selected item.
    e.DrawFocusRectangle();
}

Answer 2

希望这将有助于未来的人,因为上面的代码帮助了我,但不是100%

我仍然遇到以下问题:
- 当我选择另一个索引时,新选择的索引也会突出显示红色.
- 当我更改列表框的字体大小时,突出显示的区域将变小.

下面修复了这个问题

• 将DrawMode更改为ownerdrawvariable
• 为列表框创建MeasurItem和DrawItem事件

private void lstCartOutput_MeasureItem(object sender, MeasureItemEventArgs e)
{
   // Cast the sender object back to ListBox type.
   ListBox listBox = (ListBox)sender;
   e.ItemHeight = listBox.Font.Height;
}

private void lstCartOutput_DrawItem(object sender, DrawItemEventArgs e)
{
   ListBox listBox = (ListBox)sender;
   e.DrawBackground();
   Brush myBrush = Brushes.Black;

   if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
   {
      myBrush = Brushes.Red;
      e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(0, 64, 64)), e.Bounds);
   }

   else
   {
      e.Graphics.FillRectangle(Brushes.White, e.Bounds);

   }

   e.Graphics.DrawString(listBox.Items[e.Index].ToString(),e.Font, myBrush, e.Bounds);
   e.DrawFocusRectangle();
}

我也引用了MSDN网站.