主题：汇总求助

不知我理解的对不对？

DataTables("月报表").DataRows.Clear
Dim s As String = e.Form.Controls("月份").Value
If s <> "" Then
    Dim n As Integer = e.Form.Controls("月份").Value
    DataTables("月报表").DataRows.Clear
    Dim Arys As List(Of String())
    Arys = DataTables("入仓").GetUniqueValues("", "型号","规格")
    For Each Ary As String() In Arys
        Dim r As Row = Tables("月报表").AddNew
        r("型号") = Ary(0)
        r("规格") = Ary(1)
    Next
    For Each dr As DataRow In DataTables("月报表").DataRows
        Dim s1 As String = "型号 = '" & dr("型号") & "' And 规格 = '" & dr("规格") & "' And 月份 = '" & s & "'"
        Dim s2 As String = "型号 = '" & dr("型号") & "' And 规格 = '" & dr("规格") & "' And 月份 < " & n
        Dim Sum,Sum1 As Double
        dr("本月入仓_数量") = DataTables("入仓").Compute("Sum(入仓数量)",s1)
        dr("本月入仓_金额") = DataTables("入仓").Compute("Sum(入仓金额)",s1)
        dr("本月出仓_数量") = DataTables("出仓").Compute("Sum(出仓数量)",s1)
       
        Sum = DataTables("入仓").Compute("Sum(入仓金额)",s2)
        Sum1 = DataTables("入仓").Compute("Sum(入仓数量)",s2)
        dr("上月结存_数量") = Sum1 - DataTables("出仓").Compute("Sum(出仓数量)",s2)
       
        '-----------------------计算上月结存金额
        dr("上月结存_金额") = Sum / Sum1 * dr("上月结存_数量")
        '-----------------------
       
        dr("本月加权平均单价") = (dr("上月结存_金额") + dr("本月入仓_金额"))/(dr("上月结存_数量") + dr("本月入仓_数量"))
        dr("本月结存_数量") = dr("上月结存_数量") + dr("本月入仓_数量") - dr("本月出仓_数量")
       
        dr("本月结存_金额") = dr("本月加权平均单价") * dr("本月结存_数量")
        dr("本月出仓_金额") = dr("本月加权平均单价") * dr("本月出仓_数量")
       
    Next
End If