Mi lectura de la pregunta original es ligeramente diferente a CB's. De
Get-Foo [-foo1] <foo1Arg> [-foo2 <foo2Arg> [-bar <barArg>]]
El primer argumento $ foo1 siempre es obligatoria, mientras que si se especifica $ bar $ foo2 debe especificarse también.
Así que mi codificación sería poner $ foo1 en ambos conjuntos de parámetros.
function Get-Foo
{
[CmdletBinding(DefaultParameterSetName="set1")]
param (
[Parameter(ParameterSetName="set1", Mandatory=$true, Position=0)]
[Parameter(ParameterSetName="set2", Mandatory=$true, Position=0) ]
[string]$foo1,
[Parameter(ParameterSetName="set2", Mandatory=$true)]
[string]$foo2,
[Parameter(ParameterSetName="set2", Mandatory=$false)]
[string]$bar
)
switch ($PSCmdlet.ParameterSetName)
{
"set1"
{
$Output= "Foo is $foo1"
}
"set2"
{
if ($bar) { $Output= "Foo is $foo1, Foo2 is $foo2. Bar is $Bar" }
else { $Output= "Foo is $foo1, Foo2 is $foo2"}
}
}
Write-Host $Output
}
Get-Foo -foo1 "Hello"
Get-Foo "Hello with no argument switch"
Get-Foo "Hello" -foo2 "There is no bar here"
Get-Foo "Hello" -foo2 "There" -bar "Three"
Write-Host "This Stops for input as foo2 is not specified"
Get-Foo -foo1 "Hello" -bar "No foo2"
Luego obtiene la siguiente salida cuando ejecuta lo anterior.
Foo is Hello
Foo is Hello with no argument switch
Foo is Hello, Foo2 is There is no bar here
Foo is Hello, Foo2 is There. Bar is Three
This Stops for input as foo2 is not specified
cmdlet Get-Foo at command pipeline position 1
Supply values for the following parameters:
foo2: Typedfoo2
Foo is Hello, Foo2 is Typedfoo2. Bar is No foo2
Consulte esta pregunta: http://stackoverflow.com/questions/10748978/conditional-powershell-parameters/10749238#10749238 –