How define & Execute Powershell Functions from C#

Question

I want to create a powershell function and use it from inside the C#

using System;
using System.Management.Automation;
using System.Text;
namespace PowerShell_eg
{
    public class Program
    {
        public static void Main(String[] args)
        {
            var psFunction = @" function Get-Hostname { hostname } ";

            RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
            Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);
            runspace.Open();
            RunspaceInvoke scriptInvoker = new RunspaceInvoke(runspace);    
            Pipeline pipeline = runspace.CreatePipeline();

            ??// HOW TO Add Get-Hostname & INVOKE IT ??

            pipeline.Commands.AddScript(psFunction);
            pipeline.Commands.Add("Get-Hostname");
            var results = pipeline.Invoke();
            foreach (var obj in results.Where(o => o != null))
            {
                Console.WriteLine("\t" + obj);
            }
        }
    }
}

Currently I get CommandNotFound exception @ Invoke. The term 'Get-Hostname' is not recognized as the name of a cmdlet, function, script file, or operable program.

Please advice how to correctly do this!

Also it will be ideal if I can add multiple functions and cont. to use them over the life of the powershell session without having to add them again and again.

user189198 · Accepted Answer · 2014-01-03 14:02:40Z

3

This C# code seems to work fine for me. Just add a reference to the System.Management.Automation .NET assembly.

using System;
using System.Management.Automation;

namespace PowerShellTest02
{
    class Program
    {
        static void Main(string[] args)
        {
            string func = @"function Test { Write-Host 'hello' };";
            PowerShell ps = PowerShell.Create();
            ps.AddScript(func);
            ps.Invoke();
            ps.AddCommand("Test");
            ps.Invoke();
            Console.WriteLine("Successfully executed function");
            Console.ReadLine();
        }
    }
}

answered Jan 3, 2014 at 14:02

user189198

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1 Comment

Ashish Kumar Jaryal Over a year ago

It works, but when I provide string func='ps1 file path it shows error that the term Test is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again

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