How to read errors from Powershell pipeline in c#?

Question

I am using System.Management.Automation.Runspaces.Pipleline to create a powershell pipeline instance and execute my powershell scripts in c# console application, the problem is that if the script end up with an error, then i don't know how to print that error on the console screen.

This is my code,

System.Management.Automation.Runspaces.Runspace PowershellRunspace = System.Management.Automation.Runspaces.RunspaceFactory.CreateRunspace();
PowershellRunspace.Open();

System.Management.Automation.RunspacesPipeline PowershellPipeline = PowershellRunspace.CreatePipeline();
PowershellPipeline.Commands.AddScript(PowershellScript);
PowershellPipeline.Commands.AddScript("Out-String");
foreach (string IpAddress in ActiveSystemIPAddresses)
{

    PowershellPipeline.Commands.AddScript("Stop-Computer -ComputerName \"" + IpAddress + "\" -Credential $Credentials");
}
try
{
    Collection<PSObject> output = PowershellPipeline.Invoke();
    if (PowershellPipeline.HadErrors)
    {
        Console.WriteLine("Cannot shutdown this server IP");
    }
    PowershellPipeline.Stop();

    StringBuilder results = new StringBuilder();

    foreach (PSObject obj in output)
    {
        results.AppendLine(obj.ToString());
    }
    Console.WriteLine(results);
}
catch (Exception e)
{
    Console.WriteLine(e.Message);
}
PowershellRunspace.Close();

I can see the property Pipeline.HadErrors but it only rake me to the loop if there are errors detected, its doing anyhting to get the error message. My problem is how to get the actual error on the console screen?

Answer 1

Something like this should get you the errors.

var rs = RunspaceFactory.CreateRunspace();
rs.Open();
var ps = rs.CreatePipeline();
ps.Commands.AddScript("Get-Member");
ps.Commands.AddScript("ps");

try
{
    var result = ps.Invoke();

    if (ps.HadErrors)
    {
        var errors = ps.Error.ReadToEnd();
        foreach (var error in errors)
        {
            Console.WriteLine(error);
        }
    }

    foreach (var r in result)
    {
        Console.WriteLine(r);
    }
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}
finally
{
    ps.Stop();
}