主题：datatablebuilder如何判断是否有一样列

drs = DataTables("工艺参数记录").SQLSelect("产品= '" & cpname.Value & "' and 规格= '" & spec.value & "'")’ 这里会有很多重复的行
                For Each dr As DataRow In drs
                    If dtb.Contains(dr("编码")) = False Then
                        dtb.AddDef(dr("编码"), GetType(String), 200, Nothing, dr("项目"))
                    End If

                Next