How can I pass dynamic parameters to powershell script and iterate over the list? - powershell

Question

I want to create a powershell script that accepts dynamic parameters and I also want to iterate through them.
eg:
I call the powershell script in the following manner.
ParametersTest.ps1 -param1 value1 -param2 value2 -param3 value3
And I should be able to access my params inside the script as follows:
for($key in DynamicParams) {
$paramValue = DynamicParams[$key];
}
Is there anyway to do this in powershell? Thanks in advance.

Answer 1

There is nothing built-in like that (essentially you're asking for PowerShell parameter parsing in the absence of any definition of those parameters). You can emulate it, though. With $args you can get at all arguments of the function as an array. You can then iterate that and decompose it into names and values:
$DynamicParams = #{}
switch -Regex ($args) {
'^-' {
# Parameter name
if ($name) {
$DynamicParams[$name] = $value
$name = $value = $null
}
$name = $_ -replace '^-'
}
'^[^-]' {
# Value
$value = $_
}
}
if ($name) {
$DynamicParams[$name] = $value
$name = $value = $null
}
To iterate over dynamic parameters you can either do something like you wrote
foreach ($key in $DynamicParams.Keys) {
$value = $DynamicParams[$key]
}
(note the foreach, not for, the latter of which cannot work like you wrote it) or just iterate normally over the hash table:
$DynamicParams.GetEnumerator() | ForEach-Object {
$name = $_.Key
$value = $_.Value
}