asp.net GridView 在报表底部增加合计行

首先:在GridView 属性设置中,ShowFooter 设为 true
方法一：使用SQL查询统计出合计值，在绑定GridView时让其结果赋于一个DataTable(全局变量)，然后在RowDataBound事件中


if (e.Row.RowType == DataControlRowType.Footer)




        ...{


            e.Row.Cells[0].Text = "合计";


            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是那个全局DataTable，在绑定GridView同时将SQL查询的结果赋给它；效果如下：



方法二、直接把对应列每一行的值相加(不做数据查询，在RowDataBound事件中运算)


int mysum1 = 0; 


    int mysum2 = 0;


    protected void GridList_RowDataBound(object 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());


        }


        // 合计


        if (e.Row.RowType == DataControlRowType.Footer)




        ...{


            e.Row.Cells[0].Text = "合计";


            e.Row.Cells[1].Text = mysum1.ToString();


            e.Row.Cells[2].Text = mysum2.ToString();


        }


    }

方法三:

1. 在Web Form 的源文件中,修改GridView部分,添加 OnRowDataBound 响应函数 OnRowDataBound = "GridView1_RowDataBound"
2. 在代码页,添加该函数代码如下:
 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        GridViewRowEventArgs ea = e as GridViewRowEventArgs;
     //判断如果是底部,则执行
        if (ea.Row.RowType == DataControlRowType.Footer)
        {
            DataRowView drv = ea.Row.DataItem as DataRowView;
         // SQL 查询语句根据实际情况添加,要有合计或求平均值等函数
            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"] + "'";
         //设置数据库连接
            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();
        }
    }
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