how to retieve the index of an element which is found by array.contains method in vb.net

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i have a list of large number of string elements in array and i am using contains function to check if it contains that element. it is working fine. Now i want to get to know the index/position of element. suppose the array is

C#

dim s as string() = {"first", "second","third"}
and the string

dim l as string = "third"
method

dim b as boolean = s.Contains(l, StringComparer.CurrentCultureIgnoreCase)
flag

if (b) Then
messagebox.show("It exists") 
end if

Posted 6-Apr-15 1:03am

Sahilmanchanda

Updated 6-Apr-15 1:24am

Thanks7872

v2

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Thomas Daniels · Answer 1 · 2015-04-06T01:20:00

Use Array.IndexOf. With this method, you don't even need Contains: IndexOf returns -1 if the item doesn't exist:

VB.NET

Dim s As String() = {"first", "second", "third"}
Dim l As String = "third"
Dim i As Integer = Array.IndexOf(s, l)
If i >= 0 Then
    Console.WriteLine("it exists at index " + i.ToString())
End If

Important: if you want to use StringComparer.CurrentCultureIgnoreCase, then you cannot use the above; you'll have to use FindIndex in that case:

VB.NET

Dim i As Integer = Array.FindIndex(s, Function(x As String) x.Equals(l, StringComparison.CurrentCultureIgnoreCase))