“流水账“例子中，在区分“产品”的同时想区分“日期”该怎么做？ - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

“流水账“例子中，在区分“产品”的同时想区分“日期”该怎么做？谢谢！

下面是帮助中区分“产品”的例子

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Select Case e.DataCol.Name
    Case "产品","入库","出库"
        Dim drs As List(of DataRow)
        Dim Filter As String
        Filter = "[_SortKey] >= " & e.DataRow("_SortKey") & " And [产品] = '" & e.DataRow("产品") & "'"
        drs = e.DataTable.Select(Filter)
        For Each dr As DataRow In drs
            Filter = "[_SortKey] <= " & dr("_SortKey") & " And [产品] = '" & dr("产品") & "'"
            Dim Val1 As Double = e.DataTable.Compute("Sum(入库)",Filter)
            Dim Val2 As Double = e.DataTable.Compute("Sum(出库)",Filter)
            dr("库存") = Val1 - Val2
        Next
        If e.DataCol.Name = "产品" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then
            Filter = "[_SortKey] > " & e.DataRow("_SortKey") & " And [产品] = '" & e.OldValue & "'"
            drs = e.DataTable.Select(Filter)
            For Each dr As DataRow In drs
                Filter = "[_SortKey] <= " & dr("_SortKey") & " And [产品] = '" & dr("产品") & "'"
                Dim Val1 As Double = e.DataTable.Compute("Sum(入库)",Filter)
                Dim Val2 As Double = e.DataTable.Compute("Sum(出库)",Filter)
                dr("库存") = Val1 - Val2
            Next
        End If
End Select

主题：“流水账“例子中，在区分“产品”的同时想区分“日期”该怎么做？