private double sumReq = 0;
    private double sumOut = 0;
    protected void dgv_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        int m;
        for (m = -1; m < dgv.Rows.Count; m++)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor,this.style.backgroundColor='#00A9FF'");
                e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
            }
        }

        try
        {
            if (e.Row.RowIndex >= 0)
            {
                sumReq += Convert.ToDouble(e.Row.Cells[1].Text);
                sumOut += Convert.ToDouble(e.Row.Cells[7].Text);
            }
            else if (e.Row.RowType == DataControlRowType.Footer)
            {
                e.Row.Cells[0].Text = "物料需求总数：";
                e.Row.Cells[1].Text =  sumReq.ToString() ;
                e.Row.Cells[6].Text = "实际发料总数：";
                e.Row.Cells[7].Text =  sumOut.ToString();

            }
        }
        catch (Exception ex)
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "script", "<script>alert('" + ex.Message + "')</script>", false);
        }
    }