主题：请教~关联表问题

If e.DataCol.Name.StartsWith("工序") Then

    Dim filter As String = "产品名称 = '" & e.DataRow("产品名称") & "'"

    Dim fdr As DataRow = DataTables("产品信息").Find(filter)

    If fdr IsNot Nothing Then

        Dim sum As Double = e.DataTable.Compute("sum(数量)", filter & " and 单号 = '" & e.DataRow("单号") & "' and " & e.DataCol.Name & " = '" & e.NewValue & "'")

        sum = sum * fdr(e.DataCol.Name)

        Dim fdr2 As DataRow  = DataTables("工时统计").Find(filter & " and 单号 = '" & e.DataRow("单号") & "'")

        If fdr2 Is Nothing Then

            fdr2 = DataTables("工时统计").AddNew

            fdr2("产品名称") = e.DataRow("产品名称")

            fdr2("日期") = e.DataRow("日期")

            fdr2("单号") = e.DataRow("单号")

        End If

        If DataTables("工时统计").DataCols.Contains(e.NewValue) Then

            fdr2(e.NewValue) = sum

        End If

        If e.OldValue IsNot Nothing AndAlso DataTables("工时统计").DataCols.Contains(e.OldValue) Then

            fdr2(e.OldValue) = fdr(e.DataCol.Name) * e.DataTable.Compute("sum(数量)", filter & " and 单号 = '" & e.DataRow("单号") & "' and " & e.DataCol.Name & " = '" & e.OldValue & "'")

        End If

    Else

        msgbox("没有找到【产品信息】对应的数据!")

    End If

End If