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

• 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.verboseMessage   InvocationInfo                          PipelineIterationInfo-------   --------------                          ---------------------42        System.Management.Automation.Invocat... {0, 0}

This should be easy to translate into C#.

1.        string scriptFile = "Test.ps1";2.        using (PowerShell ps = PowerShell.Create())3.        {4.          const string getverbose = "$verbosepreference='continue'"; 5.          ps.AddScript(string.Format(getverbose));6.          ps.Invoke();7.          ps.Commands.Clear();8.          ps.AddScript(@".\" + scriptFile);9.          ps.Invoke();10.         foreach (var v in ps.Streams.Verbose)11.         {12.               Console.WriteLine(v.Message);13.         }14.       }

Important lines are line 5 and 6. This basically set the $verbosepreference for the session and for upcoming new commands and scripts.