主题：S*elect 能只选择不重复的值吗

select方法无法去除重复。

Dim drs As List(Of DataRow) = DataTables("A表").Select("勾选=false")
Dim ls As new List(of String)
For Each dr As DataRow In drs
    If ls.contains(dr("第一列")) Then
        ls.add(dr("第一列"))
    End If
Next