主题：[求助]随机组合出现重复怎么办？

Dim a() As String = {"张","林","陈"，“王”，“李”}
Dim b() As String = {"建国"，“国庆”，“旺财”}
Dim c() As String = {"男","女"}
For Index As Integer = 0 To 10
    Output.Show(a(rand.Next(0,5)) & b(rand.Next(0,3)) & c(rand.Next(0,2)))
Next

以上代码如何杜绝重复?

Dim a() As String = {"张","林","陈","王","李"}
Dim b() As String = {"建国","国庆","旺财"}
Dim c() As String = {"男","女"}
Dim ls As new List(Of String)
For Index As Integer = 0 To 10
    Dim s As String = a(rand.Next(0,5)) & b(rand.Next(0,3)) & c(rand.Next(0,2))
    If ls.Contains(s) = False
        ls.add(s)
        Output.Show(s)
    Else
        index -= 1
    End If
Next