主题：求表达式

表A的DataColChanged事件代码设置为：

 

Select Case e.DataCol.Name
    Case "金额"
        Dim dr1 As DataRow = e.DataRow
        Dim dr2 As DataRow = DataTables("表B").Find("产品1 = '" & dr1("产品") & "' And 型号3 = '" & dr1("型号") & "' And 规格2 = '" & dr1("规格") & "' And 等级4 = '" & dr1("等级") & "'")
        If dr1.IsNull("金额") Then
            If dr2 IsNot Nothing
                dr2.Delete
            End If
        Else
            If dr2 Is Nothing Then
                dr2 = DataTables("表B").AddNew
            End If
            dr2("产品1") = dr1("产品")
            dr2("型号3") = dr1("型号")
            dr2("规格2") = dr1("规格")
            dr2("等级4") = dr1("等级")
            dr2("金额6") = dr1("金额")
        End If
End Select

最好增加一个编号列，否则编码真累。