主题：自动编号提示错误

Select e.DataCol.Name
    Case "登记编号"
        If e.DataRow.IsNull("登记编号") Then
            e.DataRow("问题编号") = Nothing
        Else
            Dim lb As String = e.DataRow("登记编号")
            If e.DataRow("问题编号").StartsWith(lb) = False '如果单据编号前缀不符
                Dim max As String
                Dim idx As Integer
                max = e.DataTable.Compute("Max(问题编号)","登记编号 = '" & lb & "' And [_Identify] <> " & e.DataRow("_Identify")) '取得该登记编号的最大编号
                If max > "" Then '如果存在最大编号

                    idx = CInt(max.Substring(lb.length+1)) + 1 '获得最大编号的后三位顺序号,并加1
                Else
                    idx = 1 '否则顺序号等于1
                End If
                e.DataRow("问题编号") = lb & "-" & Format(idx,"000")
            End If
        End If
End Select