DEVEXPRESS GridControl 重繪分組行邊框

在使用DEV控件庫中的gridcontrol的分組功能時，需要給分組行加一個上邊線，將不同的組明顯的區隔開來，如下圖。

重繪分組行，可實現該需求。此處只用了 AddRowLineInfo 這個方法畫線，還有其他幾個方法，有需要的話可以繼續探索。

private void gridView1_CustomDrawGroupRow(object sender, DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs e)
{
    GridGroupRowInfo info = e.Info as GridGroupRowInfo;
    if (info == null) return;
    if (info.Column.FieldName == "CLASS")　　//符合條件的分組行
    {
        GridGroupRowPainter painter = e.Painter as GridGroupRowPainter;
        Rectangle bounds = painter.GetGroupClientBounds(info);
        AppearanceObject appearance = new AppearanceObject();
        appearance.BackColor = Color.Black;
        info.AddRowLineInfo(bounds.X, bounds.Y-2, bounds.Width, 2, appearance);
        e.Painter.DrawObject(info);
    }
}

主要參考了以下幾個鏈接：

https://www.devexpress.com/Support/Center/Question/Details/Q424679/gridview-customdrawgrouprow

https://www.cnblogs.com/wangfeng8317/p/4432151.html

https://blog.csdn.net/u011871201/article/details/70271798