Ambiguous SwitchParameter binding in PowerShell cmdlet

Question

I want to add two switch parameters to my custom PowerShell cmdlet like this:

[Parameter(Mandatory = false, ParameterSetName = "p1")]
public SwitchParameter switchOne { get; set; }

[Parameter(Mandatory = false, ParameterSetName = "p2")]
public SwitchParameter switchTwo { get; set; }

But when I run my cmdlet, it raises AmbiguousParameterSet, even if I don't specify any of them. Am I missing something here?

Do you have default parameter set specified in Cmdlet attribute? — user4003407
– user4003407, Commented Sep 11, 2018 at 18:17
No, I don't. I guess without the parameters the ambiguity would remain right? — MauriR
– MauriR, Commented Sep 11, 2018 at 18:20
Correct. Without parameters passed, it's entirely ambiguous. [Cmdlet(DefaultParameterSet = "p1")] — Maximilian Burszley
– Maximilian Burszley, Commented Sep 11, 2018 at 18:25
@TheIncorrigible1 Note in C# it is Cmdlet attribute, but not CmdletBinding attribute. — user4003407
– user4003407, Commented Sep 11, 2018 at 18:28
@PetSerAl Thanks- edited. I obviously don't write cmdlets in C#! — Maximilian Burszley
– Maximilian Burszley, Commented Sep 11, 2018 at 18:30

Jordan · Accepted Answer · 2018-09-11 18:30:49Z

1

Set the mandatory attribute to true if the switch uniquely indicates the use of a parameter set.

If this is the case then you may need to reconsider your use of parameters sets, each set should be unique, if you need a switch to indicate uniqueness then you probably don't need parameter sets.

However, without a full list of the parameters its difficult to say.

answered Sep 11, 2018 at 18:30

Jordan

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1 Comment

MauriR Over a year ago

I removed both parameter set names and it worked. I guess the two parameter sets, although with different names, specified the same number and type of parameters (One mandatory, three strings and this two of type switchParameter).

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