首先:在GridView 屬性設定中,ShowFooter 設為 true
方法一：使用SQL查詢統計出合計值，在繫結GridView時讓其結果賦於一個DataTable(全域性變數)，然後在RowDataBound事件中

 DataControlRowType.Footer)
        

{
            e.Row.Cells[0].Text ="合計";
            e.Row.Cells[3].Text = dtSum.Rows[0][0].ToString();
            e.Row.Cells[4].Text 

= dtSum.Rows[0][1].ToString();
            e.Row.Cells[5].Text = dtSum.Rows[0][2].ToString();
            e.Row.Cells[6].Text = dtSum.Rows[0][3].ToString();
            e.Row.Cells[7].Text = dtSum.Rows[0][4].ToString();
            e.Row.Cells[8].Text = dtSum.Rows[0][5].ToString();
            e.Row.Cells[9].Text 

= dtSum.Rows[0][6].ToString();
            e.Row.Cells[10].Text = dtSum.Rows[0][7].ToString();
            e.Row.Cells[11].Text = dtSum.Rows[0][8].ToString();
        }

其中dtSum是那個全域性DataTable，在繫結GridView同時將SQL查詢的結果賦給它；效果如下：


方法二、直接把對應列每一行的值相加(不做資料查詢，在RowDataBound事件中運算)

; 
    

;
    

 sender, GridViewRowEventArgs e)
    

{
        if (e.Row.RowType == DataControlRowType.DataRow )
        ...{
            DataRowView myrows=(DataRowView)e.Row.DataItem;
            mysum1 +=Convert .ToInt32 (myrows[2].ToString ());
            mysum2 += Convert.ToInt32(myrows[3].ToString());
        }
        // 合計
if (e.Row.RowType == DataControlRowType.Footer)
        ...{
            e.Row.Cells[0].Text ="合計";
            e.Row.Cells[1].Text = mysum1.ToString();
            e.Row.Cells[2].Text = mysum2.ToString();
        }
    }

方法三:

1. 在Web Form 的原始檔中,修改GridView部分,新增 OnRowDataBound 響應函式 OnRowDataBound = "GridView1_RowDataBound"

2. 在內碼表,新增該函式程式碼如下:
 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        GridViewRowEventArgs ea = e as GridViewRowEventArgs;
     //判斷如果是底部,則執行
        if (ea.Row.RowType == DataControlRowType.Footer)
        {
            DataRowView drv = ea.Row.DataItem as DataRowView;

         // SQL 查詢語句根據實際情況新增,要有合計或求平均值等函式

            string strQuery = "select 'Total' as column1,'' as column2,sum(col3) as sale_col3,sum(col4)as sum_col4 from order_v" +

                    " where OrderNo = '" + Request.QueryString["OrderNo"] + "'";

         //設定資料庫連線

            SqlConnection cn = new SqlConnection();

            cn.ConnectionString = ConfigurationManager.ConnectionStrings["MainConnectionString"].ConnectionString;

            cn.Open();

            SqlCommand cmdGetItem = new SqlCommand(strQuery, cn);

            SqlDataReader rdr;

            rdr = cmdGetItem.ExecuteReader();

            while (rdr.Read())

            {

                for (int i = 0; i < rdr.FieldCount; i++)

                {

             //填充每列的值

                    ea.Row.Cells[i].Text = rdr[i].ToString();

                }

            }

            rdr.Close();

            cn.Close();

        }

    }