GridView数据绑定时数据源为空时显示表头和"没有记录"

DataTable dt_Test  = new DataTable();

dt_Test = obj.GetList();

if(dt_Test.Rows.Count == 0)

{

    dt_Test.Rows.Add(dt.NewRow()); 

    gv_Test. DataSource = dt_Test;

    gv_Test.DataBind();

    int columnCount = dt_Test.Rows[0].Cells.Count;

    gv_Test.Rows[0].Cells.Clear();

    gv_Test.Rows[0].Cells.Add(new TableCell());

    gv_Test.Rows[0].Cells[0].ColumnSpan = columnCount;

    gv_Test.Rows[0].Cells[0].Text = "没有记录";

    gv_Test.Rows[0].Cells[0].Style.Add("text-align","center");}

else

{ 

gv_Test. DataSource = dt_Test;

gv_Test.DataBind();

}