Gridview求和，求平均数，非常简单实用

先上图片，看看是不是你需要的？

关键代码：

protected void _gvGuest_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            int count = _gvGuest.Rows.Count;

            if (e.Row.RowIndex >= 0)
            {
                sumRoom += Convert.ToDouble(e.Row.Cells[5].Text);
                sumJe += Convert.ToDouble(e.Row.Cells[6].Text);
                sumNgtKey += Convert.ToDouble(e.Row.Cells[7].Text);
                sumDyKey += Convert.ToDouble(e.Row.Cells[8].Text);
                sumResvNum += Convert.ToDouble(e.Row.Cells[9].Text);

                sumCZL += Convert.ToDouble(e.Row.Cells[10].Text);
                sumRevper += Convert.ToDouble(e.Row.Cells[11].Text);
                sumPJFJ += Convert.ToDouble(e.Row.Cells[12].Text);
            }
            else if (e.Row.RowType == DataControlRowType.Footer)
            {
                e.Row.Cells[5].Text = "汇总房间数：" + sumRoom.ToString();
                e.Row.Cells[6].Text = "汇总房金：" + sumJe.ToString();
                e.Row.Cells[7].Text = "汇总过夜房：" + sumNgtKey.ToString();
                e.Row.Cells[8].Text = "汇总日房：" + sumDyKey.ToString();
                e.Row.Cells[9].Text = "汇总使用房间数：" + sumResvNum.ToString();

                e.Row.Cells[10].Text = "平均出租率：" + (sumCZL / count).ToString("0.00") + "%";
                e.Row.Cells[11].Text = "平均Revpar：" + (sumRevper / count).ToString("0.00") + "%";
                e.Row.Cells[12].Text = "平均房价：" + (sumPJFJ / count).ToString("0.00") + "%";
            }
}

补充说明：

①GridView的ShowFooter="true"

②颜色：<HeaderStyle Font-Bold="True" ForeColor="Black" HorizontalAlign="Center" />
                <FooterStyle Font-Bold="true" ForeColor="Black" HorizontalAlign="Center" />

③GridView的OnRowDataBound="_gvGuest_RowDataBound"