绑定GRIDVIEW时无数据显示表头方法

/// <summary>
    /// 如果没有查询到任何信息则显示表头
    /// </summary>
    /// <param name="gv"></param>
    /// <param name="ds"></param>
    public static void BindNullDataSet(GridView gv, DataSet ds)
    {
        if (ds.Tables[0].Rows.Count == 0)
        {
            ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());
            gv.DataSource = ds;
            gv.DataBind();
            int columnCount = ds.Tables[0].Columns.Count;
            gv.Rows[0].Cells.Clear();
            gv.Rows[0].Cells.Add(new TableCell());
            gv.Rows[0].Cells[0].ColumnSpan = columnCount;
            gv.Rows[0].Cells[0].Text = "---没有记录---";
            gv.Rows[0].Cells[0].Style.Add("text-align", "center");
        }
        else
        {
            gv.DataSource = ds;
            gv.DataBind();
        }