主题：[求助] 关于再增加行之后不能自动生成代码的问题

照抄下面的代码，如果有问题，上传具体实例说明。

 
e.DataRow("日期")=Date.Today()
e.DataRow("工程代码")= leibie
Dim d As Date = e.DataRow("日期")
Dim y As Integer = d.Year
Dim fd As Date = New Date(y,1,1)
Dim ld As Date = New Date(y,12,31)
Dim bh As String = Format(d,"yyyy")
bh = "GDUP-BJSD/YW-" & Format(leibie,"00")&"-" & bh
Dim max As String
Dim idx As Integer
Dim flt As String
flt =  "工程代码 = '"& e.DataRow("工程代码") & "' And 制单日期 >= #" & fd & "# And 制单日期 <= #" & ld & "# And [_Identify] <> " & e.DataRow("_Identify")
max = e.DataTable.Compute("Max(编号)",flt)
If max > "" Then '如果存在最大编号
    idx = CInt(max.Substring(bh.length,4)) + 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") = bh & Format(idx,"0000")