Select Case e.DataCol.name Case "数量" Dim sumin As Double = DataTables("产品表").compute("sum(进货数量)", "产品编号 = '" & e.DataRow("产品编号") & "'") Dim sumout As Double = e.DataTable.compute("sum(数量)", "产品编号 = '" & e.DataRow("产品编号") & "' and _Identify <= " & e.DataRow("_Identify")) e.DataRow("当前库存") = sumin - sumout End Select
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