Powershell Invoke invalid command output C#

Question

I have short C# code which fires an invalid command using powershell.

using (PowerShell PowerShellInst = PowerShell.Create())
{
    PowerShellInst.AddScript("abc");
    Collection<PSObject> PSOutput = PowerShellInst.Invoke();
    Console.WriteLine(PSOutput);
}

Output is not printing anything. when same command fire using actual powershell then following output is printed.

How can I get error output in C sharp code?

this is just an invalid command, on runtime I am executing an exe file with full path , but it can happen that exe is not there. so wanted to print error — max
– max, Commented Jan 9, 2021 at 12:57

Reza Aghaei · Accepted Answer · 2021-01-09 13:36:12Z

3

To get the errors, you can check if the powershell object HadError then look into Streams.Error property of the powershell object and for each ErrorRecord, you can get the Exception, StackTrace, ToString, etc:

using (var powerShell = PowerShell.Create())
{
    var output = powerShell.AddScript("abc").Invoke();
    if(powerShell.HadErrors)
    {
        foreach(var error in powerShell.Streams.Error)
        {
            Console.WriteLine(error.ToString());
        }
    }
}

Note: PowerShell provides multiple streams for different purposes: Debug, Error, Information, Progress, Verbose, Warning. You can get the streams using Streams property of your powershell instance.

edited Jan 9, 2021 at 13:36

answered Jan 9, 2021 at 13:14

Reza Aghaei

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