CODEWITHSUNDEEP
arrayswindowspowershellarraylist
joebegborg07
joebegborg07

Reputation: 839

Add new set of values to ArrayList

So I have the following ArrayList stored in $var:

ip_prefix   region         string   
0.0.0.0/24  GLOBAL         Something
0.0.0.0/24  GLOBAL         Something
0.0.0.0/24  GLOBAL         Something
0.0.0.0/24  GLOBAL         Something

I need to add a row to this however the following code returns an error:

$var.add("127.0.0.1/32", "GLOBAL", "something")

Error:

Cannot find an overload for "Add" and the argument count: "3".
At line:1 char:1
+ $awsips.add("127.0.0.1/32", "GLOBAL", "SOMETHING")
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

I'm sure it's something simple I have to adjust, however Google searches had me going around in circles.

Upvotes: 2

Views: 6577

Answers (3)

mklement0
mklement0

Reputation: 437618

Your output suggests that your array list contains custom objects with properties ip_prefix, region, and string.

You therefore need to add a single object with the desired property values to your array list.

By contrast, you attempted to add 3 indvividual elements to the array list, which is not only conceptually wrong, but also fails syntactically, given that the .Add() method only accepts a single argument (technically, there is a method for adding multiple items, .AddRange()).

In PSv3+, syntax [pscustomobject]@{...} constructs a custom object from a hashtable literal with the definition order of the entries preserved.

$null = $var.Add(
  [pscustomobject] @{ ip_prefix="127.0.0.1/32"; region="GLOBAL"; string="something" }
)

Note how $null = ... is used to suppress the .Add() method's output (the index at which the item was inserted).

SQLAndOtherStuffGuy's answer is on the right track, but beware that $var += ... silently replaces the array list stored in $var with a regular PowerShell array ([System.Object[]]).

Upvotes: 2

SQLAndOtherStuffGuy
SQLAndOtherStuffGuy

Reputation: 214

Should do the job

   $obj = New-Object PSObject -Property @{            
        ip_prefix = "0.0.0.0/24"                
        region = "GLOBAL"              
        string = "Something"           
    }    

$var+= $obj

Upvotes: 3

David Brabant
David Brabant

Reputation: 43499

$var = New-Object System.Collections.ArrayList
$var.Add(@{"ip_prefix" = "0.0.0.0/24"; "region" = "GLOBAL"; string = "Something"})
$var.Add(@{"ip_prefix" = "127.0.0.1/32"; "region" = "GLOBAL"; string = "SOMETHING"})

$var
$var | %{ Write-Output "$($_.ip_prefix), $($_.region), $($_.string)" }

Or:

$var = @()
$var += @{"ip_prefix" = "0.0.0.0/24"; "region" = "GLOBAL"; string = "Something"}
$var += @{"ip_prefix" = "127.0.0.1/32"; "region" = "GLOBAL"; string = "SOMETHING"}

Upvotes: 4

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