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();
}