Powershell script with discoverable default values of parameter?

Question

I have written a powershell script to simple start or stop and array of services.

Here is my current script:

param([Switch] $Stop, [Switch] $Start) 

$services = @(
"Service1",
"Service2",
"Service3",
"etc"
)

if ($Start -eq $true) { 
    echo "Starting services..."
    get-service $services | start-Service
} 

if ($Stop -eq $true) { 
    echo "Stopping services..."
    get-service $services | stop-Service
} 

echo "Done."

The command is simply Services -stop or Services -start

The parameters -stop or -start are discoverable (when you hit tab) which I love.

Currently this will stop or start all the services in the array, what I would like to do is also have an option to stop or start a particular service.

This is easy enough if I modify the parameters and take in a service name.

BUT what I would really like to do, is have those services names to be fixed to the ones in my array, and to be discoverable in the same way so that hitting tab will go through the available default?

The result might be something like this:

Services -stop -service:Service1

Is this possible to do? To limit the -service to the ones in my array?

Keith Hill · Accepted Answer · 2014-02-27 05:33:58Z

3

You can do this with the ValidateSet attribute e.g.:

param(
    [Parameter()]
    [Switch]
    $Stop,

    [Parameter()]
    [Switch]
    $Start,

    [Parameter()]
    [ValidateSet("Service1","Service2","Service3","etc")]
    [string[]]
    $Service
) 

...

You would invoke tab completion like so:

Services -stop -service <tab>

answered Feb 27, 2014 at 5:33

Keith Hill

204k44 gold badges370 silver badges377 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

shenku Over a year ago

I'll give it a try, can I use the same array or will I have to duplicate that portion? (within the validateset)

Duncan Over a year ago

You can access the validateset, but it's a bit messy:

$services = $MyInvocation.MyCommand.Parameters['Service'].Attributes | ? { $_.TypeId.Name -eq 'ValidateSetAttribute' } | select -ExpandProperty ValidValues

Collectives™ on Stack Overflow

Powershell script with discoverable default values of parameter?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related