主题：[求助]计算BOM

Dim dic As new Dictionary(of String,Integer)

DataTables("零件需求").DataRows.Clear()

For Each dr1 As DataRow In DataTables("订单").DataRows

    For Each dr2 As DataRow In DataTables("物料清单").Select("[阀门型号] = '" & dr1("规格型号") & "'")

        Dim nm As String = dr2("子图号")

        Dim vl As Integer = dr1("数量") * dr2("单位用量")

        If dic.ContainsKey(nm) = False

            dic.Add(nm,vl)

        Else

            dic(nm) = dic(nm)+ vl

        End If

    Next

Next

For Each key As String In dic.keys

    Dim dr As DataRow = DataTables("零件需求").AddNew()

    dr("子图号") = key

    dr("订单用量") = dic(key)

Next
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