PowerShell中的多个参数集

Question

Is it possible to use multiple sets to make two sets of parameters exclusive of each other, but inclusive with the other two sets? For example, say I had four parameters:

param(
    $param1,
    $param2,
    $param3,
    $param4,
)

Param1 and 2 are exclusive of each other, but can be called whether 3 or 4 are called. Similarly, param3 and 4 are exclusive of each other, but can be called whether 1 or 2 are called. These are the okay sets of parameters that can be called together:

./MyScript.ps1 -param1 -param3
./MyScript.ps1 -param1 -param4
./MyScript.ps1 -param2 -param3
./MyScript.ps1 -param2 -param4

These shouldn't be called at the same time:

./MyScript.ps1 -param1 -param2
./MyScript.ps1 -param1 -param3 -param4
./MyScript.ps1 -param2 -param3 -param4
./MyScript.ps1 -param3 -param1 -param2
./MyScript.ps1 -param4 -param1 -param2
./MyScript.ps1 -param3 -param4

I've tried a few things, but all of them seem to cause weird output, and still allow me to call what I would think to be "illegal" parameter sets. Here is an example of the parameter sets as I set them up:

[Parameter(ParameterSetName="onethree",Mandatory=$true,HelpMessage="a or b")]
[Parameter(ParameterSetName="onefour",Mandatory=$true,HelpMessage="a or b")]
[ValidateSet("a","b")]
[string]$one,
[Parameter(ParameterSetName="twothree",Mandatory=$true)]
[Parameter(ParameterSetName="twofour",Mandatory=$true)]
[switch]$two,
[Parameter(ParameterSetName="onethree")]
[Parameter(ParameterSetName="twothree")]
[string[]]$PropertyClass,
[Parameter(ParameterSetName="onefour")]
[Parameter(ParameterSetName="twofour")]
[string[]]$PropertyName

The script executes, but it doesn't complete correctly (If I call it with $two, it tries doing something with $one and causes the script to fail). If I tab through the possible parameters, I don't see $two; but if I type -t and hit [tab], it will autocomplete to -two . Any ideas what could be causing this? Is it possible to do what I'm looking for?

Answer 1

Use Get-Help

The best way to see what the parameter sets are is to use Get-Help My-Function . I created a function called Test-Sets with your given param() block, and this is the output from Get-Help :

SYNTAX
    Test-Sets -one <string> {a | b} [-PropertyName <string[]>]  [<CommonParameters>]

    Test-Sets -one <string> {a | b} [-PropertyClass <string[]>]  [<CommonParameters>]

    Test-Sets -two [-PropertyName <string[]>]  [<CommonParameters>]

    Test-Sets -two [-PropertyClass <string[]>]  [<CommonParameters>]

This looks like it satisfies your requirements, unless you always want 2 parameters, in which case I think the only thing you need to do is make $PropertyClass and $PropertyName mandatory in each of their 2 parameter sets.

If I'm missing something here, please clarify and include the failing command as @mike z requested.