GRIDVIEW绑定显示合计某一列,合计结果始终为0,哪里错误了?

Question

 protected void gvInfos_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            int sumdays = 0;
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //sumdays = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "WDays"));
                //sumdays = int.Parse(DataBinder.Eval(e.Row.DataItem, "WDays").ToString());
                sumdays = int.Parse(e.Row.Cells[2].Text);
            }
            else if (e.Row.RowType == DataControlRowType.Footer)  //页脚 
            {
                e.Row.Cells[0].Visible = false;
                e.Row.Cells[1].Text = "合计：";
                e.Row.Cells[1].ColumnSpan = 2;
                e.Row.Cells[1].HorizontalAlign = HorizontalAlign.Right;
                e.Row.Cells[2].Text = sumdays.ToString();
            }
        }

Answer 1

应该是没有执行这：
if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //sumdays = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "WDays"));
                //sumdays = int.Parse(DataBinder.Eval(e.Row.DataItem, "WDays").ToString());
                sumdays = int.Parse(e.Row.Cells[2].Text);
            }

Answer 2

onrowdatabound="gvInfos_RowDataBound" 前台已经加了这个啊控件上?

Answer 3

int sumdays;
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //sumdays = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "WDays"));
                //sumdays = int.Parse(DataBinder.Eval(e.Row.DataItem, "WDays").ToString());
                sumdays = int.Parse(e.Row.Cells[2].Text);
            }
           
  if (e.Row.RowType == DataControlRowType.Footer)  //页脚 
            {
                e.Row.Cells[0].Visible = false;
                e.Row.Cells[1].Text = "合计：";
                e.Row.Cells[1].ColumnSpan = 2;
                e.Row.Cells[1].HorizontalAlign = HorizontalAlign.Right;
                e.Row.Cells[2].Text = sumdays.ToString();
            }

Answer 4

参考：
http://www.cnblogs.com/insus/articles/1433589.html