PowerShell Add-Member Examples

gistfile1.txt

# Create a new object
$Person = [PSCustomObject]@{
    FirstName = 'Nickolaj';
    LastName = 'Andersen';
    Age = 27
    };
# Add a custom "type" name to the object called "Person"
$Person.pstypenames.Add('Person');


# EXAMPLE #1: Add a GetFullName() method, that simply concatenates the first & last names of a Person
$FullNameMethod = { '{0} {1}' -f $this.FirstName, $this.LastName; };
Add-Member -InputObject $Person -MemberType ScriptMethod -Name GetFullName -Value $FullNameMethod;

# TEST: Get the Person's full name
$Person.GetFullName();

# EXAMPLE #2: Add a Validate() method that ensures the Person object meets type requirements
$ValidateMethod = { $this.FirstName.Length -ge 2 -and $this.FirstName.Length -lt 20; };
Add-Member -InputObject $Person -MemberType ScriptMethod -Name Validate -Value $ValidateMethod;

# TEST: Test out the Validate() method
$Person.Validate(); # Validate the Person object. Should return $true, because the first name is longer than 2, and less than 20 characters
$Person.FirstName = 'a'; # Change the person's first name
$Person.Validate(); # Returns $false, because first name is only one character