Can I somehow get `Get-Content` cmdlet output into `ArrayList` object?

Question

I'm trying to cast output from Get-Content myfile.txt into an ArrayList object so that I can easily insert and change strings with .add and .insert. What I've tried is

[Systems.Collections.ArrayList]mylist=@()
Get-Content myfile | $mylist # obviously wrong
Get-Content myfile | ForEach-Object {$mylist} # don't quite grasp the logic, get empty array as a result
Get-Content myfile | ForEach-Object {$mylist.Add()} # get overload error

if I just assign $mylist=Get-Content myfile.txt it will change data type to static array which I don't want

Get-Content myfile | ForEach-Object {$mylist.Add($_)} you need to actually pass a value to Add method? — 4c74356b41
– 4c74356b41, Commented Jan 18, 2017 at 13:02

arco444 · Accepted Answer · 2017-01-18 13:03:27Z

Get-Content returns an array, so you can cast directly to an ArrayList:

$mylist = [System.Collections.ArrayList](Get-Content myfile)
$mylist.gettype()                                                                                                                                                                                       

IsPublic IsSerial Name                                     BaseType                                                                                                                                        
-------- -------- ----                                     --------                                                                                                                                        
True     False    ArrayList                                System.Object

Now you can modify with the .add() or .insert() methods like:

$mylist.insert(2,"new content")

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