ParameterSetName and mandatory validtion

[schwallers]

I don't think paramtersetname is working correctly.
When using parametersets the mandatory setting validation is taking priority over the parametersets.
The below param setting should make C mandatory if using A and optional if using B. Currently all 3 are mandatory and that results in an "AmbiguousParameterSet" error on submit.

param
(
[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
}

[markdomansky]

ParameterSetName is not supported. Depending on your use case, it can be made to work, without the mandatory fields and doing validation within the function.