主题：这个字符串的比较代码怎么写

Dim ls1 = "1,2,3".split(",")
Dim ls2 = "aa,1,2,cc".split(",")
Dim s1 As String = ""
For Each s As String In ls2
    If array.Indexof(ls1, s) < 0 Then
        s1 &= s & ","
    End If
Next
msgbox(s1)

怎么比较，输入什么，比较什么，最后得到什么？

 

Dim s1 As String = "aaa,bbb,ccc"
Dim s2 As String = "bbb1"
If s1.contains(s2) = False Then
    s1 = s1 & "," & s2
End If
msgbox(s1)

请直接说，在哪里输入什么，最后得到什么？怎么比较？

参考代码

 

Dim s1 As String = "aaa,bbb,ccc"
Dim s2 As String = "bbb1"
If s1.contains(s2) = False Then
    s1 = s1 & "," & s2
End If
msgbox(s1)

删掉的参考

 

Dim s1 As String = "aaa,bbb,ccc"
Dim s2 As String = "aaa"
If s1.contains(s2) Then
    s1 = ("," & s1 & ",").Replace("," & s2 & ",", ",")
End If
msgbox(s1.trim(","))

 

你不应该循环返回值。你应该循环所有switch的id，看具体得到的值是什么，如果没有选中，得到的是空白。