ComboBox ItemHeight 再高一点

        public static void BindData(this ComboBox box, List<KeyValuePair<long, string>> data)
        {
            box.ItemHeight = 18;
            box.DropDownStyle = ComboBoxStyle.DropDownList;
            box.DrawMode = DrawMode.OwnerDrawFixed;
            box.DataSource = data;
            box.DrawItem += (sender, e) =>
            {
                if (e.Index < 0)
                {
                    return;
                }
                e.DrawBackground();
                e.DrawFocusRectangle();
                e.Graphics.DrawString(data[e.Index].Value.ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds.X, e.Bounds.Y + 3);
            };
        }