Capturing Powershell output in C# after Pipeline.Invoke throws

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Not sure if this is helpful. I am guessing you are running V1. This V2 approach doesn’t throw and prints the result:

Hello World
67 errors

string script = @"
  'Hello World'
  ps | % {
    $_.name | out-string1
  }
";

PowerShell powerShell = PowerShell.Create();

powerShell.AddScript(script);
var results = powerShell.Invoke();

foreach (var item in results)
{
  Console.WriteLine(item);
}

if (powerShell.Streams.Error.Count > 0)
{
  Console.WriteLine("{0} errors", powerShell.Streams.Error.Count);
}

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