主题：[求助]请帮忙分析下这段代码！这个n1 值怎么有问题 老是=1

看看红色的地方。

Dim s As String = Tables("综合部物品分类设置_综合部物品分类设置Table1").current("分类编号")
Dim s1 As String
Dim i As Integer = s.LastIndexOf(".")
s1 = s.SubString(0,i)

output.show(s1)

Dim s2,s3 ,s4 As String
Dim dr,dr1 As DataRow
Dim n,n1 As Integer
Dim dt As DataTable = Tables("综合部物品分类设置_综合部物品分类设置Table1").DataTable

dr = dt.AddNew
s2 =  "SubString(分类编号, 1, " & i & ") = '" & s1  & "' And len(分类编号) = " & s.Length
dr1 =  dt.Find(s2)
s3= s1 & "."
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") = s3 & "01"
Else
    For Each dr In dt.Select(s2)
        n=dr1("分类编号").Substring(s1.Length + 1)
        n1=iif(n1<n,n,n1)
    Next
End If
output.show(n1)