Dim num As Integer = 50 For Each bh As String In DataTables("表A").GetValues("编号") Dim drs As List(Of DataRow) = DataTables("表A").Select("编号 = '" & val(bh) & "'", "日期 Desc") If drs.Count > 1 Then For i As Integer = 1 To drs.Count - 1 drs(i)("编号") = num num += 1 Next End If Next