Scripting Games Commentary: VIII Creating Objects
I saw a lot of code like this during the games
| 001
002
003
004
005
006
007
008
009
010
011
| $comp = Get-WmiObject -Class Win32_ComputerSystem
$os = Get-WmiObject -Class Win32_OperatingSystem
$myobject = New-Object -TypeName PSObject
Add-Member -InputObject $myobject -MemberType NoteProperty -Name "Make" -Value $comp.Manufacturer
Add-Member -InputObject $myobject -MemberType NoteProperty -Name "Model" -Value $comp.Model
Add-Member -InputObject $myobject -MemberType NoteProperty -Name "OS" -Value $os.Caption
Add-Member -InputObject $myobject -MemberType NoteProperty -Name "SP" -Value $os.CSDVersion
$myobject |
Get some stuff, create an object and add the properties. That’s a lot of typing. A slightly easier way is like this
| 001
002
003
004
005
006
007
008
009
010
011
| $comp = Get-WmiObject -Class Win32_ComputerSystem
$os = Get-WmiObject -Class Win32_OperatingSystem
$myobject = New-Object -TypeName PSObject
$myobject | Add-Member -MemberType NoteProperty -Name "Make" -Value $comp.Manufacturer -PassThru |
Add-Member -MemberType NoteProperty -Name "Model" -Value $comp.Model -PassThru |
Add-Member -MemberType NoteProperty -Name "OS" -Value $os.Caption -PassThru |
Add-Member -MemberType NoteProperty -Name "SP" -Value $os.CSDVersion
$myobject |
This time we get the pipeline to do some of the work for us using the –passthru parameter to keep passing the object to the next Add-Member
But wait
There’s an even better and easier way
| 001
002
003
004
005
006
007
008
009
010
011
| $comp = Get-WmiObject -Class Win32_ComputerSystem
$os = Get-WmiObject -Class Win32_OperatingSystem
$myobject = New-Object -TypeName PSObject -Property @{
Make = $comp.Manufacturer
Model = $comp.Model
OS = $os.Caption
SP = $os.CSDVersion
}
$myobject |
Use the –property parameter on new-object and create a hash table of the property names and values. The hash table can be created earlier is required.
Recommendation – create the properties using the hash table method. Set the values at creation if you know them otherwise simple set as they become available.
Keep the typing down, keep the bugs down and keep the Power up.