How to capture a Powershell CmdLet's verbose output when the CmdLet is programmatically Invoked from C#

Answer 1

• Verbose output is not actually output unless $VerbosePreference is set at least to "Continue."
• Use the PowerShell type to run your cmdlet, and read VerboseRecord instances from the Streams.Verbose propery

Example in powershell script:

ps> $ps = [powershell]::create()
ps> $ps.Commands.AddScript("`$verbosepreference='continue'; write-verbose 42")
ps> $ps.invoke()
ps> $ps.streams.verbose
Message   InvocationInfo                          PipelineIterationInfo
-------   --------------                          ---------------------
42        System.Management.Automation.Invocat... {0, 0}

This should be easy to translate into C#.

-Oisin

PowerShell MVP

http://www.nivot.org/