DataRowView获取数据或模板列控件值

[左手青春右手年华]

后台：

 protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
     
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            //只统计当前页
          
            DataRowView drv = (DataRowView)e.Item.DataItem;
            ta1 = ta1 + Convert.ToDecimal(drv["b"]);
            ta2 = ta2 + Convert.ToDecimal(drv["a"]);
            ta3 = ta3 + Convert.ToDecimal(drv["c"]);

ta4?
ta5?
——————————————————————————

<td style="width:7%;"><asp:Label ID="labchengben" runat="server" Text='<%# Eval("b", "{0:f2}")%>'></asp:Label> </td>
<td style="width:7%;"> <asp:Label ID="labxiaoshou" runat="server" Text='<%# Eval("a", "{0:f2}")%>'></asp:Label></td>
<td style="width:7%;"> <asp:Label ID="labchajia" runat="server" Text='<%# Eval("c", "{0:f2}")%>'></asp:Label></td>
<td style="width:7%;"> <asp:Label ID="labhuikuan" runat="server" Text='<%# MoneyBack(Eval("empid"))%>'></asp:Label></td>
<td style="width:6%;"> <asp:Label ID="labguodishui" runat="server" Text='<%# GuoDiShui(Eval("c"))%>'></asp:Label></td>
__________________________________________

后台绑定的字段可以直接用 ta1 = ta1 + Convert.ToDecimal(drv["b"]);来统计该列，如果后台绑定的是一个方法怎么统计这列