如何在ASP.NET中通过列表填充的网格视图中添加脚注行

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
    <Columns>
        <asp:BoundField DataField="ColumnName" HeaderText="Column Header" />
        <!-- 其他列字段 -->
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // 获取数据源
        DataTable dt = GetData();

        // 设置数据源
        GridView1.DataSource = dt;
        GridView1.DataBind();

        // 添加脚注行
        AddFooterRow();
    }
}

private DataTable GetData()
{
    // 从数据库或其他数据源获取数据
    // 示例代码：
    DataTable dt = new DataTable();
    dt.Columns.Add("ColumnName");
    dt.Rows.Add("Row 1");
    dt.Rows.Add("Row 2");
    return dt;
}

private void AddFooterRow()
{
    GridViewRow footerRow = new GridViewRow(0, 0, DataControlRowType.Footer, DataControlRowState.Normal);

    TableCell footerCell = new TableCell();
    footerCell.ColumnSpan = GridView1.Columns.Count;
    footerCell.Text = "脚注内容";
    footerRow.Cells.Add(footerCell);

    GridView1.Controls[0].Controls.Add(footerRow);
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    // 可以在此处对每一行进行处理，如添加样式等
}