Powershell script how to handle parameters that are directly passed to a module

Question

I am creating a wrapper and in my ps1 file I want to invoke:

ConnectTo-PSSession -Path "test" -Confirm

Since I want to wrap this call I've created a ps1 file with those same params:

Param(
  [string]$Path,
  [switch]Confirm
)

Now I would like to call the ConnectTo-PSSession with those parameters but the main problem is that I dont want to even call the flag if its not required:

ConnectTo-PSSession -Path $Path $Confirm //Confirm here is not working

I took a look at Invoke-Expression but it seems like it will have security issues. Is there a way for me to achieve my result without Invoke-Expression? I can of course start writing If statements but this does not scale well with multiple parameters since I will need a insane amount of those checks.

Theo · Accepted Answer · 2020-11-19 11:52:56Z

2

Since you have made Confirm as switch parameter (but forgot to prefix it with a dollar sign), change the script like this:

Param(
  [string]$Path,
  [switch]$Confirm
)
ConnectTo-PSSession -Path $Path -Confirm:$Confirm

Now, if you invoke that script with the -Confirm switch, it will be interpreted as $true, whereas when you leave the swith off, ConnectTo-PSSession with Confirm being interpreted as $false

answered Nov 19, 2020 at 11:52

Theo

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T-Me · Accepted Answer · 2020-11-19 11:55:18Z

0

Two things:

you can provide a default value in the param block:

Param(
  [string]$Path = $PWD ,
  [switch]$Confirm = $True
)

The Switch parameter won't accept the value of $Confirm without especialy beeing called. To calle the switch parameter use ... -Confirm:$Confirm without a space after :

answered Nov 19, 2020 at 11:55

T-Me

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3 Comments

Theo Over a year ago

Why would you give a switch parameter a default value of $True, where it already has a default value of $False when not present in the call?

T-Me Over a year ago

@Theo Depends on how you implement it. I have seen a lot of switch parameters, that do the opposite of what their name would suggest. Others are inversed like -NoConfirmation or something like that. In one of my scripts I calculate the value of a switch based uppon if another parameter is filled: [switch]$useGUI = $([string]::IsNullOrEmpty($CsvPath)) > Switch is $true if no CsvPath is provided. in that case I show a GUI. Otherwise the script is pure commandline. But I can force it to show GUI and provide the path, too!

Theo Over a year ago

But then I suggest you define it as [bool] and not use [switch] contrary to what it is designed for..

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