Powershell list of objects of a class type

Question

I am trying to iterate through a list of objects of a class type. The class looks like this :

Class UrlTestModel
{
    [String]$Name
    [String]$Url
    [String]$TestInProd
}

So I would like to be able to create a list of objects that contain the three strings above, then iterate through the list and do stuff with the data. For some reason I cant see a way to do that. Seems simple enough. I am kinda new to powershell, and come from a C# background, so I might be thinking too C# and not enough powershell. :)

If you already have a list of objects it's as simple as $list |ForEach-Object { <# Do somthing with $_ #> } or foreach($item in $list){ <# do something with $item here #> } — Mathias R. Jessen
– Mathias R. Jessen, Commented Oct 26, 2020 at 16:35

marsze · Accepted Answer · 2020-10-26 16:56:52Z

3

You can create a new instance this way:

New-Object -TypeName "UrlTestModel" -Property @{
    Name = "string"
    Url = "string"
    TestInProd = "string"
}

Or define a constructor in your class:

class UrlTestModel
{
    [String]$Name
    [String]$Url
    [String]$TestInProd

    UrlTestModel([string]$name, [string]$url, [string]$testInProd) {
        $this.Name = $name
        $this.Url = $url
        $this.TestInProd = $testInProd
    }
}

And then create a new instance like this:

[UrlTestModel]::new("string", "string", "string")

You can read more about it in about_Classes.

Lists are basically created by using the comma operator:

$list = [UrlTestModel]::new("name1", "url1", "true"), [UrlTestModel]::new("name2", "url2", "false")

# or

$a = New-Object -TypeName UrlTestModel -Property @{Name = "string"; Url = "string"; TestInProd = "string" }
$b = New-Object -TypeName UrlTestModel -Property @{Name = "string"; Url = "string"; TestInProd = "string" }
$list = $a, $b

Iterate over a list using the ForEach-Object cmdlet or the foreach statement:

$list | ForEach-Object {
    # this is the current item:
    $_
}

# or 

foreach ($item in $list) {
    # ... 
}

edited Oct 26, 2020 at 16:56

answered Oct 26, 2020 at 16:50

marsze

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1 Comment

evolmonster Over a year ago

Thank you! It didnt work while using the New-Object, but when declaring the class with a constructor, works a charm.

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