筛选重复的代码

Dim idx As String = "-1,"
Dim idx_temp As String = ""
Dim pdr As DataRow = Nothing
Dim count As Integer = 0
For Each dr As DataRow In DataTables("表A").Select("", "第一列,第二列")
    If pdr IsNot Nothing AndAlso (pdr("第一列") <> dr("第一列") OrElse pdr("第二列") <> dr("第二列")) Then
        If count > 1 Then
            idx &= idx_temp
        End If
        count = 1
        idx_temp = ""
    Else
        count += 1
    End If
    idx_temp &= dr("_Identify") & ","
    pdr = dr
Next

If count > 1 Then
    idx &= idx_temp
End If

Tables("表A").filter = "_Identify in (" & idx.trim(",") & ")"