……Dim ls_sfzhm As new List(Of String)
For n As Integer = 1 To Sheet.Rows.Count -1
Dim sfzhm As String = sheet(n,nms("系统单号")).Text
If sfzhm = "" Then Continue For
Dim dr As DataRow = dt.Find("系统单号 = '" & sfzhm & "'")
If dr Is Nothing Then
If ls_sfzhm.Contains(sfzhm) = False Then
ls.add(n)
ls_sfzhm.Add(sfzhm)
End If
Else
dic.Add(dr, n)
End If
Next
……