主题：排班（遍历）方法思路求教

如果层数是固定的，建议直接写多层循环，否则，就需要写成递归。下面代码，是三层的，看懂代码

Dim dt As DataTable = DataTables("表A")
Dim drs = dt.Select("第二列 is not null")
Dim s0 As String = drs(0)("第二列")
For Each ss0 As String In s0.split(",")
    Dim s1 As String = drs(1)("第二列")
    Dim ls As new List(Of String)
    ls.add("")
    ls.add("")
    ls.add("")
    ls(0) = ss0
    For Each ss1 As String In s1.split(",")
        If ls.contains(ss1) Then Continue For
        ls(1) = ss1
        Dim s2 As String = drs(2)("第二列")
        For Each ss2 As String In s2.split(",")
            If ls.contains(ss2) Then Continue For
            ls(2)= ss2
            output.show(String.Join("|", ls.ToArray))
        Next
    Next
Next