主题：[求助]已知集合中的某一值，如何引用该值对应的索引。

Dim v1() As String = {"中国","美国","日本","俄罗斯"}
Dim s2 As New List(of String)
s2.AddRange(v1) '将集合s1中的元素全部加入到集合s2中
For i As Integer = 0 To s2.Count-1
    If s2(i) = "俄罗斯"
        Output.Show(i)
    End If
Next

'循环判断下集合吧

Dim Names As New List(Of String)
Names.Add("中国")
Names.Add("美国")
Names.Add("日本")
Names.Add("俄罗斯")
For i As Integer = 0 To Names.Count - 1
    If Names(i) = "俄罗斯" Then
        Output.Show(i)

        Exit For
    End If
Next