How to find the indexOf element in ArrayList in PowerShell

Question

I am trying to find the index of an element from an arraylist using powershell script,however getting the below given error

Method invocation failed because [System.String[]] doesn't contain a method named 'IndexOf'.

Code Used:

[String[]]$eventList = New-Object System.Collections.ArrayList
$eventList.GetType().FullName 
$index = $eventList.IndexOf('cvv');

'cvv' is an string that i m trying to find in $eventList which is null the thing is i want the location of 'cvv' in $eventList null it should return '-1' but it is returning error — Lovepreet Singh
– Lovepreet Singh, Commented Jan 29, 2016 at 6:07

dugas · Accepted Answer · 2016-01-28 17:04:42Z

1

You are casting the ArrayList to an array, just remove the cast:

$eventList = New-Object System.Collections.ArrayList

Also, you might want to consider using a List<string> instead of an ArrayList:

$eventList = New-Object System.Collections.Generic.List[string]

answered Jan 28, 2016 at 17:04

dugas

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2 Comments

Mathias R. Jessen Over a year ago

List<string> for the win! It'll also allow you to find indices based on predicates rather than string literals: $evenList.FindIndex({param($s) $s -match 'cv[u-z]'})

dugas Over a year ago

$s represents the item in the list

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