Embedding PowerShell in your C# Application author :Douglas Finke

Invoke-Template.txt

function Invoke-Template {
  param(
  [string]$Path,
  [Scriptblock]$ScriptBlock
 )
function Get-Template {
  param($TemplateFileName)
  $content = [IO.File]::ReadAllText(
  (Join-Path $Path $TemplateFileName) )
  Invoke-Expression "@`"`r`n$content`r`n`"@"
  }
  & $ScriptBlock
}

PsExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Management.Automation;

namespace breezhang.Copy.Douglas Finke.to.github.com
{
    public static class PsExtensions
    {
        public static List<PSObject> ExecutePs(
            this string script, bool writeToConsole = true)
        {
            var powerShell = PowerShell
                .Create()
                .AddScript(script);
            if (writeToConsole)
            {
                powerShell.AddCommand("Out-String");
                powerShell
                    .Invoke<PSObject>()
                    .ToList()
                    .WritePs();
            }
            // Lets the caller act on the returned collection
            // of PowerShell objects
            return powerShell
                .Invoke<PSObject>()
                .ToList();
        }
        public static void WritePs(this List<PSObject> psResults)
        {
            psResults.ForEach(Console.WriteLine);
        }
    }
}

test.txt

var script = "Get-Process | Where {$_.Handles -gt 400}";
 // Let the extension method
// print out the results
  script.ExecutePs();
  // In PowerShell v3, PSObject
  // implements IDynamicObject
  foreach (dynamic item in
  script.ExecutePs(writeToConsole: false))
  {
  Console.WriteLine(item.ProcessName);
  }