DEV Gridcontrol 查询得到0条记录时显示自定义的字符提示/显示

private void gridView_CustomDrawEmptyForeground(object sender, DevExpress.XtraGrid.Views.Base.CustomDrawEventArgs e)
{
if (this.judge_ds(dsDt))
{
string str = "没有查询到你所想要的数据!";
Font f = new Font("宋体", 10, FontStyle.Bold);
Rectangle r = new Rectangle(e.Bounds.Top + 25, e.Bounds.Left + 25, e.Bounds.Right - 25, e.Bounds.Height - 25);
e.Graphics.DrawString(str, f, Brushes.Black, r);
}
}

#region 判断ds是否为空
private bool judge_ds(DataSet ds)
{
bool flag = false;
if (ds == null||ds.Tables.Count == 0||(ds.Tables.Count == 1 && ds.Tables[0].Rows.Count == 0))
{
flag = true;
}
return flag;
}
#endregion