C#中怎么给GridView添加页脚以实现统计某一列值的和

C#中如何给GridView添加页脚以实现统计某一列值的和
第一步：设置GridView的属性：ShowFooter=true第二步：定义一个全局变量，以备使用，如:

在GridViewShow()函数中：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e){        if (e.Row.RowType == DataControlRowType.DataRow)        {            //----------鼠标移动到每项时颜色交替效果            e.Row.Attributes["onmouseover"] = "e=this.style.backgroundColor;this.style.backgroundColor='#FFFF99'";            e.Row.Attributes["onmouseout"] = "this.style.backgroundColor=e";            //----------设置悬浮鼠标指针形状为小手"            e.Row.Attributes["style"] = "Cursor:hand";            //----------鼠标点击某行即选中某行            e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(this.GridView1, "Select$" + e.Row.RowIndex);        }        if (GridView1.FooterRow != null)        {            GridView1.FooterRow.Visible = true;        }        if (e.Row.RowType == DataControlRowType.Footer)          // 判断当前项是否为页脚        {            e.Row.Cells[4].HorizontalAlign = HorizontalAlign.Right;  //因为示例中该GridView为7列            e.Row.Cells[4].Text = "费用合计：";            e.Row.Cells[5].Text = thisTotal.ToString()+" 元";            e.Row.Cells[5].HorizontalAlign = HorizontalAlign.Center;            e.Row.Cells[6].Text = "共计:"+total+" 元";            e.Row.Cells[6].HorizontalAlign = HorizontalAlign.Center;        }}

这样，便可以实现统计某一列的值了。