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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