Question

我一直在寻找一种向GridView添加累计总列的方法，该列将显示该行中某个数字列的累计总数。所以基本上：

Points | Running Total
2      | 2
1      | 3
-0.5   | 2.5
1.5    | 4

我在cumulative totals using SQL Server和其他数据库上看到了一些问题，但我没有发现严格使用GridView而不更改任何SQL，所以我想我会在这里发布我的解决方案。

Answer 1

该解决方案只处理RowDataBound并将给定字段的值添加到类的成员变量中。然后，该成员变量中的值显示在Running Total列中，该列包含用于此目的的标签。

在GridView aspx代码中：

<asp:GridView runat="server" ID="gvHistory" datasourceid="dsHistory" AutoGenerateColumns="false" AllowSorting="false" 
    onrowdatabound="gvHistory_RowDataBound">
        <Columns>
            <asp:BoundField HeaderText="Date" DataField="Date"  SortExpression="Date" DataFormatString="{0:d}" />
            <asp:BoundField HeaderText="Points" DataField="nPoints" />
            <asp:TemplateField HeaderText="Running Total">
                <ItemTemplate>
                    <asp:Label runat="server" ID="lblRunningTotal" Text=""></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
</asp:GridView>

这是RowDataBound处理程序的代码

Protected m_runningTotal As Double = 0

Protected Sub gvHistory_RowDataBound(sender As Object, e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then

        Dim pointsString As String = e.Row.DataItem("nPoints")
        Dim points As Double
        If Double.TryParse(pointsString, points) Then
            m_runningTotal = m_runningTotal + points

            Dim lblRunningTotal As Label = e.Row.FindControl("lblRunningTotal")
            lblRunningTotal.Text = m_runningTotal.ToString
        End If
    End If
End Sub

GridView列中的运行/累计总数

1 个答案: