主题：[求助]请教编号代码中的一个问题！！！！

看不懂你的代码，很乱，这么简单的要求，并不应该写这么复杂的代码。

红色的部分帮你修正了一下，可以避免你说的问题。

Dim trv As WinForm.TreeView = e.form.Controls("TreeView1")
If trv.SelectedNode.Text <> "全部" Then
    Dim t As Integer = trv.SelectedNode.Text.LastIndexOf(" ")
    Dim s As String = trv.SelectedNode.Text.SubString(0,t)
    Dim i As Integer = s.Length - 2
   
    Dim s2,s3,s4 As String
    Dim dr,dr1,dr2 As DataRow
    Dim n,n1 As Integer
    Dim dt As DataTable = Tables("表A").DataTable
   
    dr = dt.AddNew
    s2 =  "SubString(分类编号, 1, " & t & ") = '" & s & "' And len(分类编号) = " & t+2
    dr1 =  dt.Find(s2)
    If dt.DataRows.count =1  OrElse  dr1 Is Nothing Then 'dt.DataRows.count =1 是因为有dr = dt.AddNew,增加了一行
        dr("分类编号") = s & "01"
    Else
        For Each dr2 In dt.Select(s2)
            n = right(dr2("分类编号"),2)
            n1= iif(n1<n,n,n1)
        Next
       
        For n  = 1 To n1
            If dt.Find("分类编号 = '" & s & Functions.Execute("数值转换2",n) & "'") Is Nothing Then
                dr("分类编号") = s & Functions.Execute("数值转换2",n)
            End If
        Next
        If dr.Isnull("分类编号") Then
            dr("分类编号") = s & Functions.Execute("数值转换2",n1+1)
        End If

    End If
End If
With Tables("表A")
    .Position = .Rows.Count - 1
End With