How to create dynamic class instances from multiple class modules in PowerShell

Question

I have several class modules (let's assume classA, classB and so on) created for different purposes. From the main file, I want to create instance dynamically from each class

Rather than creating instance one by one like below, I want to create them dynamically through a loop. The below "classname" value cannot be replaced by a variable ($classname) as I checked. Any proper method to get this done?

[<classname>]$instance = [<classname>]::new()

Answer 1

You can use the -as operator or simply cast [type] to instantiate them, for example:

class A {
    $prop = 'classA' 
}
class B {
    $prop = 'classB' 
}
class C {
    $prop = 'classC' 
}

foreach ($i in 'A', 'B', 'C') {
    ($i -as [type])::new() # with `-as`
    ([type] $i)::new()     # casting
}

Assuming you will be instantiating many times using this method, it will be preferable to cache the types in different variables (using class A as example):

$classA = 'A' -as [type]
0..10 | ForEach-Object {
    $classA::new()
}

Alternatively, personally wouldn't recommend this method, but you can use New-Object:

foreach ($i in 'A', 'B', 'C') {
    New-Object $i
}