Finding an item in an array

$LogsPath = '\someserversomepath*'
$LogsProperties = Get-ChildItem -Path $LogsPath -recurse |
Select-String -Pattern '[a-z]' |
Select-Object -Property Filename, Path, Line

$Array = @()
$LogsProperties | foreach
$Array += $LogsProperties



The query above will create an array with the following values

(dashes are tabs/columns)

Filename--------------------------Path--------------------------------------------------------------Line

FName1 LName1.txt-----------\someserversomepathFName1
LName1.txt-----------XXX Value

FName2 LName2.txt-----------\someserversomepathFName1
LName1.txt-----------YYY Value

FName3 LName3.txt-----------\someserversomepathFName1
LName1.txt-----------ZZZ Value

$Array[0]


Returns:

FName1 LName1.txt-----------\someserversomepathFName1
LName1.txt-----------XXX Value

Can someone tell me how to search for the index of an element using a value

The function below doesn't work for me

$array.indexof('XXX Value')
0 <-- expected result, index of the array


and will return the error below

Method invocation failed because [System.Object] doesn't contain a
method named 'indexof'. At line:20 char:15
+ $array.indexof <<<< ('XXX Value')
+ CategoryInfo : InvalidOperation: (indexof:String) , RuntimeException
+ FullyQualifiedErrorId : MethodNotFound

2 Answers
2

As pointed out in The Incorrigible1's answer, $LogsProperties is already an array, whose elements are [pscustomobject] instances with properties FileName, Path, and Line.

$LogsProperties

[pscustomobject]

FileName

Path

Line

(Your attempt to create $Array from $LogsProperties is not only unnecessary, but also broken, because the elements of $Array all end up referencing the array referenced by $LogsProperties as a whole.)

$Array

$LogsProperties

$Array

$LogsProperties

In order to use the .IndexOf() method on array instances^[1], PSv3+ is required.
PSv3+ also allows you to use member enumeration, so you can apply .IndexOf() to $LogsProperties.Line in order to search the array of .Line property values:

.IndexOf()

.IndexOf()

$LogsProperties.Line

.Line

$LogsProperties.Line.IndexOf('XXX Value') # -> 0


In PSv2 you can use a foreach loop to determine the index:

foreach

$i = 0
foreach ($obj in $LogsProperties) if ($obj.Line -eq 'XXX Value') break ; ++$i
if ($i -eq $LogsProperties.Count) $i = -1
# $i now contains the index of the matching element or -1, if not found.


^{[1] Type System.Array, the base type for all arrays, also has a static .IndexOf() method that is available in PSv2 too. However, given the need to search the .Line property values of the array elements of $LogProperties, that won't help here, unless a separate array with just the .Line property values is constructed first.}

System.Array

.IndexOf()

.Line

$LogProperties

.Line

break

[string]$index += "$i"

$index = $null

$i = 0

.IndexOf()

foreach

$i

-1

So your $logsProperties is already an array. You can filter using Where-Object or the Where array method:

$logsProperties

Where-Object

Where

$logsProperties = Get-ChildItem -Path \someserversomepath* -Recurse |
Select-String -Pattern '[a-z]' |
Select-Object -Property FileName, Path, Line


Filtering:

$logsProperties | Where-Object Line -like '*xxx value*'


or:

$logsProperties.Where$_.Line -like '*xxx value*'


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