Passing switch parameter thru pipeline in PowerShell - function

Question

Passing switch parameter thru pipeline in PowerShell
Problem
I am trying to make a function that has a switch parameter, but also I want to able to pass all function parameters thru pipeline in a script, and I don't know ho to do that. Is it that even possible? I my case I load parameters from .csv file in witch values are string values.
Exposition
To simplify my problem and to make it easier for others to use answers of this question, I am not going to use my code but an abstract version of my code. Let us call my function New-Function that has a -StringParameter, a -IntParameter and a -SwitchParameter parameters. And just to be clear in my .csv file all fields are named same as the New-Function parameters.
Using the function
Normally I you can use the New-Function this way:
New-Function -StringParameter "value" -IntParameter 123 -SwitchParameter
But I also want to use the New-Function this way:
$Data = Import-Csv -Path "$PSScriptRoot\Data.csv" -Delimiter ';'
$Data | New-Function
My attempts
I have tried to convert the string values in pipe line to boolean but it seems like the function's -SwitchParameter does not accept boolean($true, $false) values, because it skipping the process block completely when I debug it.
$Data | ForEach-Object -Process {
if ($_.SwitchParameter -eq "true") {
$_.SwitchParameter = $true
}
else {
$_.SwitchParameter = $false
}
} | New-Function
My temporary workaround
I have settled to use a string parameter instead of a switch parameter, so I can feed the New-Function with data thru pipeline from a .csv file with no problem.
function New-Function {
param (
[Parameter(Position = 0, Mandatory, ValueFromPipelineByPropertyName)]
[string]
$StringParameter,
[Parameter(Position = 1, Mandatory, ValueFromPipelineByPropertyName)]
[int]
$IntParameter,
[Parameter(Position = 2, ValueFromPipelineByPropertyName)]
[string]
$SwitchParameter = "false"
)
#----------------------------------------------------------------------------
}

Answer 1

You have to convert values for switch parameter to boolean type.
It works to me:
function Out-Test
{
param
(
[Parameter(ValueFromPipelineByPropertyName)]
[String]
$Label,
[Parameter(ValueFromPipelineByPropertyName)]
[Switch]
$Show
)
process
{
$Color = if ($Show) { 'Yellow' } else { 'Gray' }
Write-Host -ForegroundColor $Color $Label
}
}
$row1 = '' | select Label, Show
$row1.Label = 'First'
$row1.Show = 'True'
$row2 = '' | select Label, Show
$row2.Label = 'Second'
$row1.Show = 'False'
$rows = $row1, $row2
$rows |% { $_.Show = [bool]$_.Show }
$rows | Out-Test
Result:

Answer 2

You can convert your string to a Boolean object while leaving your parameter as type [switch] in your function. The Boolean type will be coerced into [switch] during binding.
$Data | Foreach-Object {
$_.SwitchParameter = [boolean]::Parse($_.SwitchParameter)
$_
} | New-Function
Alternatively, you can update all of your objects first and then pipe to your function. It matters how your function handles the input objects.
$Data | Foreach-Object {
$_.SwitchParameter = [boolean]::Parse($_.SwitchParameter)
}
$Data | New-Function
Part of the issue with your Foreach-Object attempt is that you never output the updated object $_ before piping into your function.