How to create an object of a custom class in Window PowerShell console?

Question

I have created a simple class using Windows PowerShell ISE. The class definition is as follows.

class Person {
 [string] $FirstName
 [string] $LastName
    
    Person() {        
    }
    
    [string] Greeting() {
        return "Greetings, {0} {1}!" -f $this.FirstName, $this.LastName
    }
}

Now from within PowerShell console when I attempt to create an object from this class like this:

$x = [Person]::new()

It says

Unable to find type [Person].

Did you run the code to load the class in memory? Or did you dot source the file? Or did you using module? — Santiago Squarzon
– Santiago Squarzon, Commented Feb 7, 2022 at 17:35
This is as expected. Defining a new type in one process doesn't automatically define it in another. — Mathias R. Jessen
– Mathias R. Jessen, Commented Feb 7, 2022 at 17:39
Save the class as file "Person.ps1". Assuming you are in the same directory in the console, type: . .\Person.ps1 to make the class available in the console. Note the space between the two dots! This is called dot-sourcing. Not the most scalable approach, but easy to use for simple stuff. — zett42
– zett42, Commented Feb 7, 2022 at 19:44
Ok. I dot-sourced my script and I'm able to successfully create the object like the following . F:\Per\PowerShell\PowerShell_Classes.ps1 $myobj = [Person]::new() Bundle of thanks — user1575786
– user1575786, Commented Feb 8, 2022 at 15:54

Alex Korobchevsky · Accepted Answer · 2022-02-08 03:04:20Z

2

Your class definition is perfectly valid. The easiest way of starting to use your class is adding code in the same file below:

class Person {
 [string] $FirstName
 [string] $LastName
    
    Person() {        
    }
    
    [string] Greeting() {
        return "Greetings, {0} {1}!" -f $this.FirstName, $this.LastName
    }
}

# Using constructor
$x = [Person]::new()

# Setting up properties
$x.FirstName = "Alex"
$x.LastName = "K"

# Running a method
$x.Greeting()

Greetings, Alex K!

answered Feb 8, 2022 at 3:04

Alex Korobchevsky

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