Advanced Windows PowerShell Scripting Video Training

Advanced Windows PowerShell Scripting Video Training
Advanced Windows PowerShell Scripting Video Training

Monday, March 18, 2013

New Way to add Note Properties with PowerShell V3

For those of you who have taken my PowerShell V2 class probably remember the step-by-step exercise that I took you through to help you build a custom object.  In PowerShell V3, we can create a new NoteProperty with a smaller amount of code.  Below is code that creates an object with a single note property.
$Obj = New-Object -TypeName PSObject
$Obj | Add-Member -MemberType NoteProperty -Name "Value1" -Value 10
Using the Add-Member cmdlet, we declare the member type that we are adding “NoteProperty”. Then we provide it with a name and a value.  In PowerShell V3, two new parameters were added to the Add-Member cmdlet.  They are –NotePropertyName and –NotePropertyValue.  Below is the same object created with this new method.
$Obj = New-Object -TypeName PSObject
$Obj | Add-Member -NotePropertyName "Value1" -NotePropertyValue 10
If your code will be running on clients or servers using PowerShell V2, do not use this new method.  Take a look at the screen shot below.
image
You can see that the script successfully executes in PowerShell V3.  When I switch the shell to the V2 engine and then executed the code, PowerShell V2 hit a run time error because its version of Add-Member does not have a parameter for ‘NotePropertyName’.
Just one of the little hidden tricks inside of PoSH V3.  As always, code for the lowest level of PowerShell that your code will execute on.

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