Value for switch parameter from pipeline - powershell

Question

I need to pass parameters to a script from pipeline input by importing the required values from CSV file. The original script has more than 15 parameters to be passed and input values are stored in a CSV file. I am posting a simple example to express the issue.
Below are the contents of CSV file (Input.csv)
ResourceGroupName,SetThrottling
TestRG1,1
TestRG2,0
TestRG3,1
TestRG4,0
TestRG5,0
Script file - Switch-FromPipelineTest.ps1
[CmdletBinding()]
Param(
[Parameter(Mandatory=$True, ValueFromPipeline=$True, ValueFromPipelineByPropertyName=$True)]
[String]$ResourceGroupName,
[Parameter(ValueFromPipeline=$True, ValueFromPipelineByPropertyName=$True)]
[Switch]$SetThrottling
)
Begin {}
Process {
Function TestingValues {
Param(
$ResourceGroupName,
$SetThrottling
)
Write-Host "$ResourceGroupName is set to $SetThrottling"
}
TestingValues -ResourceGroupName $ResourceGroupName -SetThrottling $SetThrottling
}
End {}
If I run the command Import-Csv .\Input.csv | .\Switch-FromPipelineTest.ps1 it gives an error as given below:
C:\Scripts\Switch-FromPipelineTest.ps1 : Cannot process argument
transformation on parameter 'SetThrottling'. Cannot convert value
"System.String" to type "System.Management.Automation.SwitchParameter".
Boolean parameters accept only Boolean values and numbers, such as
$True, $False, 1 or 0.
At line:1 char:26
+ Import-Csv .\Input.csv | .\Switch-FromPipelineTest.ps1
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidData: (#{ResourceGroup...etThrottling=1}:PSObject) [Swith-FromPipelineTest.ps1], ParameterBindingArgumentTransformationException
+ FullyQualifiedErrorId : ParameterArgumentTransformationError,Switch-FromPipelineTest.ps1
In order to make this work, I have to run below command:
Import-Csv -Path .\Input.csv -Verbose |
Select-Object -Property ResourceGroupName,#{n='SetThrottling';e={[bool][int]$_.SetThrottling}} |
.\Switch-FromPipelineTest.ps1
Is there a way we can omit the type casting done by using custom property expression in the second command? As in the original script, I have several [switch] parameters and I need to do the same thing for each [switch] parameter.

Answer 1

Convert the string values to boolean values upon importing the CSV:
Import-Csv 'C:\path\to\input.csv' |
Select-Object -Property *,#{n='SetThrottling';e={
[bool][int]$_.SetThrottling
}} -Exclude SetThrottling | ...
You need to do this for every switch parameter you want to import from a CSV.
If you want to avoid this, change your parameters from switches to set-validated parameters and adjust the parameter evaluation accordingly:
[Parameter(ValueFromPipeline=$True, ValueFromPipelineByPropertyName=$True)]
[ValidateSet('0', '1')]
[string]$SetThrottling