winform checkedlistbox 设置行颜色

Posted 2020-12-04 lucika

重写OnDrawItem事件

public class ColorCodedCheckedListBox : CheckedListBox{
    protected override void OnDrawItem(DrawItemEventArgs e)
    {
         base.OnDrawItem(e);
    }
}    

　　自定义时，需要重新声明DrawItemEventArgs对象，然后调用base.OndrawItem方法。

DrawItemEventArgs e2 = new DrawItemEventArgs(e.Graphics, e.Font, new Rectangle(e.Bounds.Location, e.Bounds.Size), 
e.Index, (e.State & DrawItemState.Focus) == DrawItemState.Focus ? DrawItemState.Focus : DrawItemState.None, Color.Orange, this.BackColor);

如果想根据Item内容绘制不同样式的Item时，只需要在该事件中访问e.Index即可。

protected override void OnDrawItem(DrawItemEventArgs e)
        {
            if(e.Index%2==0)
            {
                DrawItemEventArgs e2 = new DrawItemEventArgs(e.Graphics, e.Font, 
new Rectangle(e.Bounds.Location, e.Bounds.Size), 
e.Index, (e.State & DrawItemState.Focus) == DrawItemState.Focus ? DrawItemState.Focus : DrawItemState.None, Color.Orange, this.BackColor);
                base.OnDrawItem(e2);
            }
            else
                base.OnDrawItem(e);
        }