How to use on DynamicParam in a function based upon input from a parameter
Cmdlet Dynamic Parameters
Cmdlets can define parameters that are available to the user under special conditions, such as when the argument of another parameter is a specific value. These parameters are added at runtime and are referred to as dynamic parameters because they are added only when they are needed. For example, you can design a cmdlet that adds several parameters only when a specific switch parameter is specified.
Get more info about these DynamicParam : https://msdn.microsoft.com/en-us/library/dd878299(v=vs.85).aspx
function get-info {
Param(
[Parameter()]
[ValidateSet('A', 'B')]
[string] $Target
)
DynamicParam {
# Ensure $Target is defined
try { [void]$Target }
catch { $Target = [string]::Empty }
if ($Target -eq 'B') {
$target += "...si si"
}
}
end {
Write-Host $Target
}
}

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