主题：[求助]统计

  Select Case e.DataCol.Name
    Case "商品编号","商品名称"
        Dim dr As DataRow
        Dim mr As DataRow = e.DataRow
        Dim drs As List(of DataRow)
        dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [商品编号] = '" & mr("商品编号") & "'", "[_SortKey] Desc")
        If dr Is Nothing Then
            mr("结存_数量") = mr("入库_入库数量")+mr("期初_期初数量")+ mr("出库_出库数量")
            mr("结存_金额") = mr("入库_入库金额")+mr("期初_期初金额")- mr("出库_出库金额")
            dr = mr
        End If
        drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [商品编号] = '" & dr("商品编号") & "'", "[_SortKey]")
        For i As Integer = 1 To drs.Count - 1
            drs(i)("结存_数量") = drs(i-1)("结存_数量") + drs(i)("入库_入库数量") - drs(i)("出库_出库数量")
            drs(i)("结存_金额") = drs(i-1)("结存_金额") + drs(i)("入库_入库金额") - drs(i)("出库_出库金额")
        Next
        If e.DataCol.Name = "商品编号" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then
            dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [商品编号] = '" & e.OldValue & "'", "[_SortKey] Desc")
            If dr Is Nothing Then
                dr = e.DataTable.Find("[商品编号] = '" & e.OldValue & "'", "[_SortKey]")
                If dr IsNot Nothing Then
                    dr("结存_数量") = dr("入库_入库数量")- dr("出库_出库数量")
                    dr("结存_金额") = dr("入库_入库金额")- dr("出库_出库金额")
                End If
            End If
            If dr IsNot Nothing Then
                drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [商品名称] = '" & dr("商品名称") & "'", "[_SortKey]")
                For i As Integer = 1 To drs.Count - 1
                    drs(i)("结存_数量") = drs(i-1)("结存_数量") + drs(i)("入库_入库数量") - drs(i)("出库_出库数量")
                    drs(i)("结存_金额") = drs(i-1)("结存_金额") + drs(i)("入库_入库金额") - drs(i)("出库_出库金额")
                Next
            End If
        End If
End Selec

老师，该公式不能及时动态更新，