Select e.DataCol.Name
    Case "家庭住址"
        If e.DataRow.IsNull("家庭住址") Then
            e.DataRow("编号") = Nothing
        Else
            Dim lb As String = e.DataRow("家庭住址")
            If e.DataRow("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(编号)","家庭住址 = \'" & lb & "\' And [_Identify] <> " & e.DataRow("_Identify")) \'取得该类别的最大编号
                If max > "" Then \'如果存在最大编号
                    idx = CInt(max.Substring(4,5)) + 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("编号") = lb & Format(idx,"00000")
            End If
        End If
End Select

执行上面代时出现示找到integer的公共成员startswith是什么原因，编号列的设置的是整数型