List of string contains or not

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Dim numbers As New List(Of String)()
       numbers.Add("One")
       numbers.Add("Two")
       numbers.Add("Three")

       If Not numbers.Contains("on5e") = False Then
           MsgBox("not exist")
       Else
           MsgBox("exist")
       End If

What I have tried:

i need to get true or false
i getting error on both

Posted 3-Jan-21 17:55pm

Member 10974007

Updated 3-Jan-21 20:23pm

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RickZeeland · Answer 1 · 2021-01-03T19:50:00

Try like this:

Imports System
Imports System.Collections.Generic
				
Public Module Module1
	Public Sub Main()
		
		Dim numbers As New List(Of String)
       numbers.Add("One")
       numbers.Add("Two")
       numbers.Add("Three")

       If Not numbers.Contains("One") Then
			Console.WriteLine("not exist")
       Else
			Console.WriteLine("exist")
       End If
	End Sub
End Module

Maciej Los · Answer 2 · 2021-01-03T20:23:00

Quote:
i need to get true or false
i getting error on both

I have no idea, why you're getting an error... Your code is working fine. You can test it this way:

VB

Dim result As Boolean =  numbers.Contains("on5e")
Console.WriteLine(result) 'displays "False"

If you're interested in comparison ignoring case, you can try this:

VB

Dim result As Boolean =  numbers.Contains("one", StringComparer.InvariantCultureIgnoreCase)
Console.WriteLine(result) 'displays "True"

For further details, please see: StringComparer | Microsoft Docs[^]

List of string contains or not

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