如何将 Powershell 信息控制台输出捕获到变量？

Question

I can't seem to figure out how to capture the quoted text below for parsing. I've tried setting it to a variable as well as redirecting all streams with *>&1 . How can I grab the output text? The *>&1 works for errors, but not for the text below for some reason? Writing to a file is not an option.

Connect-Mailbox -Identity $guidT -user $targetDNT -Alias $aliasT -Database $databaseT -DomainController $domainSpecificDCsSourceAccountT[0]

I've also tried

$outValue = Connect-Mailbox -Identity $guidT -user $targetDNT -Alias $aliasT -Database $databaseT -DomainController $domainSpecificDCsSourceAccountT[0] *>&1

WARNING: The operation completed successfully but the change will not become effective until Active Directory replication occurs.

[edit] For repro, this command appears to fall into the same situation, and is easier to setup/configure

$var = Set-Mailbox $sourceUserT -LitigationHoldEnabled $false

[edit2]

Some commands like set-mailbox will work if you change the type from a string to an array such as but connect-mailbox is not able to use that?

So this was kind of dumb luck, it works for the set-mailbox command but not the connect-mailbox command?

PS> Set-Mailbox "first.last" -LitigationHoldEnabled $false -WarningVariable wv
    WARNING: The command completed successfully but no settings of 'xxx/last, first' have been modified.

PS> $wv

PS>

However when it did it this way

[System.Collections.ArrayList]$wvar = @();
Set-Mailbox "onprem.detailee1" -LitigationHoldEnabled $false -WarningVariable +wvar
WARNING: The command completed successfully but no settings of 'xxxx/last, first' have been modified.

PS> write-host $wvar
The command completed successfully but no settings of 'xxxx/last, first' have been modified.

So Powershell cannot cast some outputs (warning, error, etc) to a string, however they can add the object to an array. Strangely enough the non-typing portion of the Powershell language is not applicable here.

Answer 1

You should be able to use the -WarningVariable Common Parameter to capture messages destined for the warning stream.

Connect-Mailbox -Identity $guidT -user $targetDNT -Alias $aliasT -Database $databaseT -DomainController $domainSpecificDCsSourceAccountT[0] -WarningVariable WarningVar

$WarningVar

The common parameters include variable options for messages sent to the error, information, and warning streams.

Answer 2

One way I found to do this was to set erroraction explicitly to stop ( -ea stop ) for the cmdlet in a try catch statement, then I could get the exception value with $_.Exception.Message in the catch statement as it forces the cmdlet to have a terminating error.

This is something I've found to be frustrating coming from c# where a try/catch statement works without having to explicitly define an error as terminating or not. If you do not do that for some cmdlets, the try/catch will not work and it will never catch the terminating error.

Hopefully this helps others, more info

https://www.vexasoft.com/blogs/powershell/7255220-powershell-tutorial-try-catch-finally-and-error-handling-in-powershell

Answer 3

The problem most likely stems from buggy behavior with respect to streams from implicitly remoting commands , such as created via Import-PSSession ; this GitHub issue is presumably related.

You have already found one workaround, as demonstrated in your question: if you explicitly create the target variable to pass to -WarningVariable as a System.Collections.ArrayList instance and pass the variable name prefixed with + ( -WarningVariable +var ) - normally intended for appending to a preexisting variable value - capturing the warning(s) is possible.

A slightly simpler workaround is to call the command via Invoke-Command and apply -WarningVariable to the latter :

Invoke-Command -WarningVariable warnings {
  Connect-Mailbox -Identity $guidT -user $targetDNT -Alias $aliasT -Database $databaseT -DomainController $domainSpecificDCsSourceAccountT[0]
}

# $warnings now contains any warnings emitted by the command.

Answer 4

您是否尝试过以下操作？

$var = myCommand | out-string