C# DevExpress Winform ComboBoxEdit 下拉框选项颜色交替

DevExpress的ComboBoxEdit的下拉框的选项要设置背景色就需要用它的DrawItem的绘制事件来实现，交替颜色就根据索引奇偶数来判断设置相应的颜色，废话不多说，直接上代码，（为了方便RepositoryItemComboBox在GridView上面的使用，封装了一个方法通用使用）

效果图：

 封装的方法：

       public static void SetComboBoxEditEvenOldItem(DevExpress.XtraEditors.Repository.RepositoryItemComboBox edit,Color evenColor,Color oldColor,Color selectColor)
        {
            edit.DrawItem += (s, e) =>
            {
                Brush backBrush1 = new SolidBrush(evenColor);
                Brush backBrush2 = new SolidBrush(oldColor);
                Brush backBrush3 = new SolidBrush(selectColor);
                string itemText = e.Item.ToString();
                if ((e.State & DrawItemState.Selected) != 0)
                {
                    e.Cache.FillRectangle(backBrush3, e.Bounds);
                    //ControlPaint.DrawBorder3D(e.Graphics, e.Bounds);
                    e.Cache.DrawString(itemText, new Font(e.Appearance.Font.Name,
                      e.Appearance.Font.Size, FontStyle.Bold), new SolidBrush(Color.Black),
                      e.Bounds, e.Appearance.GetStringFormat());
                    e.Handled = true;
                    return;
                }
                if (e.Index % 2 == 0)
                {
                    e.Cache.FillRectangle(backBrush1, e.Bounds);
                }
                else
                {
                    e.Cache.FillRectangle(backBrush2, e.Bounds);
                }
                e.Cache.DrawString(itemText, e.Appearance.Font, new SolidBrush(Color.Black),
                  e.Bounds, e.Appearance.GetStringFormat());
                e.Handled = true;
            };
        }

调用示例：

public Form1()
        {
            InitializeComponent();
            SetComboBoxEditEvenOldItem(comboBoxEdit1.Properties, Color.FromArgb(224, 251, 254), Color.FromArgb(198, 241, 249), Color.FromArgb(253, 192, 47));
        }