Running a powershell command in C# errors with, "Cannot invoke this function because the current host does not implement it"

Question

I have an application that I use to run Exchange Powershell commands inside C# code like below. This is an example of the relevant lines I use to run the powershell command.

            RunspaceConfiguration rsConfig = RunspaceConfiguration.Create();
        PSSnapInException snapInException = null;

        //load Exchange shell
        rsConfig.AddPSSnapIn("Microsoft.Exchange.Management.PowerShell.E2010", out snapInException); 
        Runspace runSpace = RunspaceFactory.CreateRunspace(rsConfig);

        //open runspace
        runSpace.Open();

        //setup pipeline
        Pipeline pipeLine = runSpace.CreatePipeline();
        String sScript = "get-mailbox -identity 'rj'";

        //add script to pipeline
        pipeLine.Commands.AddScript(sScript);

        //run the script
        pipeLine.Invoke();
        pipeLine.Dispose();

This code works perfect in all cases until now. the script I am trying to run instead of the one above is to set the RetentionPolicy for a mailbox. The script I am trying to run looks like this:

Set-Mailbox -Identity 'rj' -RetentionPolicy 'Main Campus Retention Policy'

When I run this in powershell itself it works perfectly but when I try to run it using the code below I get the error, "Cannot invoke this function because the current host does not implement it."

From this error, it almost seems like the command that runs in C# cannot run the RetentionPolicy command but that doesn't make much sense. I have Googled this and tried everything suggested but no luck.

If anyone knows why this is happening, it would be very helpful.

Jaykul · Accepted Answer · 2010-11-18 20:34:35Z

11

If that command would normally prompt for confirmation then you will need to either:

Set -Confirm:$false as a parameter (and possibly -Force as well)
Set $ConfirmPreference = "None" before calling Set-Mailbox (and possibly -Force too)
Create a Host and implement the Confirm functionality ;-)

answered Nov 18, 2010 at 20:34

Jaykul

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4 Comments

RJ. Over a year ago

You nailed it with the -Force. It worked perfect once I added that. Thanks for the help, that completes these requirements. Awesome!

Jaykul Over a year ago

@Kiquenet, I believe the simple answer is just to set the sScript that he's executing to: Set-Mailbox -Identity 'rj' -RetentionPolicy 'Main Campus Retention Policy' -Confirm:$false -Force

Tarun Arora Over a year ago

Interesting. I'll try out the -Force approach. Any ways, if you are still interested, here is the same for implementing the interfaces for PSHost, Pshostuserinterface and pshostrawuserinterface. stackoverflow.com/questions/1233640/…

fero Over a year ago

-Confirm:$false did the trick for Add-RecipientPermission, too. Now I can finally add SendAs permissions. Thanks.

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