Example
function myFunction
{
param(
# If parameter 'a' is used, then 'c' is mandatory
# If parameter 'b' is used, then 'c' is optional, but allowed
# You can use parameter 'c' in combination with either 'a' or 'b'
# 'a' and 'b' cannot be used together
[parameter(ParameterSetName="AandC", mandatory=$true)]
[switch]$a,
[parameter(ParameterSetName="BandC", mandatory=$true)]
[switch]$b,
[parameter(ParameterSetName="AandC", mandatory=$true)]
[parameter(ParameterSetName="BandC", mandatory=$false)]
[switch]$c
)
# $PSCmdlet.ParameterSetName can be used to check which parameter set was used
Write-Host $PSCmdlet.ParameterSetName
}
# Valid syntaxes
myFunction -a -c
# => "Parameter set : AandC"
myFunction -b -c
# => "Parameter set : BandC"
myFunction -b
# => "Parameter set : BandC"
# Invalid syntaxes
myFunction -a -b
# => "Parameter set cannot be resolved using the specified named parameters."
myFunction -a
# => "Supply values for the following parameters:
# c:"
