How to convert function to script method?

Question

I have a powershell function, is there any way to convert it into a script method?

function Do-Something {
  Param( 
     $p1,
     $p2
     )
 [...]
}

I am trying to convert it to script method in below fashion, but it throws exception.

$obj | add-member-membertype scriptmethod { $function:Do-Something }

fdafadf · Accepted Answer · 2018-01-24 09:20:46Z

3

This code shows two examples. In my opinion the first Add-Member shows better approach which is more OOP.

function Convert-PersonToText
{
    param($Person)
    '{0} {1}' -f $Person.FirstName, $Person.LastName
}

function Print-Something
{
    Write-Host 'Something'
}

function New-Person
{
    param($FirstName, $LastName)

    $result = '' | select FirstName, LastName
    $result.FirstName = $FirstName
    $result.LastName = $LastName
    Add-Member -InputObject $result -MemberType ScriptMethod -Name 'ToText' -Value { Convert-PersonToText -Person $this }
    Add-Member -InputObject $result -MemberType ScriptMethod -Name 'Print' -Value ((Get-Command -Name 'Print-Something').ScriptBlock)
    $result
}


$person = New-Person -FirstName 'John' -LastName 'Smith'
$person.ToText() | Out-Host
$person.Print()

Output:

John Smith
Something

edited Jan 24, 2018 at 9:20

answered Jan 24, 2018 at 9:10

fdafadf

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2 Comments

Samselvaprabu Over a year ago

@fdafdaf can function in another module be used here?

fdafadf Over a year ago

In second Add-Member approach you can use only script modules (not binary modules). In the first Add-Member example you can use anything.

Paweł Dyl · Accepted Answer · 2018-01-24 09:14:49Z

2

Here is another approach (you can mix it with @fdafadf solution):

function Do-Something { param($p1) Write-Host $p1 }
$obj = @{}
$obj | Add-Member -MemberType ScriptMethod -Name "DoSomething" -Value ${function:Do-Something}
$obj.DoSomething(3)

answered Jan 24, 2018 at 9:14

Paweł Dyl

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3 Comments

Samselvaprabu Over a year ago

Dyl how to param in this approach?

Paweł Dyl Over a year ago

There is already a param. DoSomething(3) is called, 3 becomes $p1 and goes directly to Write-Host

Samselvaprabu Over a year ago

oh then while defining we can just add the function name. While calling we can pass param. Isn’t it? Will this approach works if function is in different file ( or in different psm1)?

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