How do I pass a parameter that should be $null in powershell via C#

Question

Exchange management requires you to pass $null as a parameter to remove forwarding from a mailbox:

Set-Mailbox -ForwardingAddress $null -DeliverToMailboxAndForward $false

This (IMHO) translates to:

command = new PSCommand().AddCommand("Set-Mailbox");
          command.AddParameter("Identity",task.TargetUser);
          command.AddParameter("FowardingAddress", null);
          command.AddParameter("DeliverToMailboxAndForward", false);
ps.Commands=command;
var results = ps.Invoke();

Unfortunately, the Invoke chokes on the "ForwardingAddress" setting: A parameter cannot be found that matches parameter name 'FowardingAddress'.

How can I pass a parameter that ends up as $null?

@SteveMitcham - doesn't modify the forwarding if I don't set SOMETHING for ForwardingAddress — dragonspeed
– dragonspeed, Commented Jan 20, 2015 at 19:37

Keith Hill · Accepted Answer · 2015-01-20 21:06:20Z

8

If that parameter is of type string then you should be able to pass this value:

System.Management.Automation.Language.NullString.Value

or include

using System.Management.Automation.Language;

and then later

command.AddParameter("ForwardingAddress",NullString.Value);

Another option is to use $null via the AddScript method:

var script = String.Format("Set-Mailbox -Identity {0} -ForwardingAddress $null -DeliverToMailboxAndForward $false", task.TargetUser);
new PSCommand().AddScript(script);

edited Jan 20, 2015 at 21:06

answered Jan 20, 2015 at 19:14

Keith Hill

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4 Comments

dragonspeed Over a year ago

How would I put that in my c# code? I'm a bit perplexed.

Steve Mitcham Over a year ago

System.Management.Automation.Language.NullString.Value

dragonspeed Over a year ago

Sadly, it looked quite promising, but still comes back with the same error :(

dragonspeed Over a year ago

Which turns out to be fat-finger syndrome on my part.

Community · Accepted Answer · 2017-05-23 11:47:10Z

2

Passing null should work fine. As this question shows, C#'s nulls are mapped to $null.

Assuming the code you're showing is copy-pasted directly from your solution, I'm guessing the problem is that you're passing a value to the parameter "FowardingAddress", rather than "ForwardingAddress" (note the missing 'r'). A simple typo, not a type mismatch. :)

edited May 23, 2017 at 11:47

CommunityBot

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answered Jan 20, 2015 at 21:28

Avner Shahar-Kashtan

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2 Comments

dragonspeed Over a year ago

Urgh. Freeform parameter values are the death of me. Fixed! Thanks.

Keith Hill Over a year ago

Good eye. I had to look at those two for about 30 seconds before I saw where the missing 'r' was supposed to be. Dang brain auto-correct. :-)

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