C# and DLL call in Powershell

C# and DLL call in Powershell Updated 160205

I recently needed to combine C# and powershell. I found varios way to combine this.
One obviuos way is to compile C#-code as a dll and call the included functions from powershell.
Another way is to actually include the source code from C# directly in a powershell script and run it.
One advantage of this is that the C# code can be run on any system that permits running powershell scripts, and
the source code can be changed very easy without a compiler.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClassLib
{
    public class Class1
    {
        public static string retfromdll()
        {
            string retstr = "Return string from dll";
            return retstr;
        }
    }
}
Listing 1 source code for the dll

#############################
# Csharp code in Powershell #
#############################

$Global:namestr="Testname in global var"

$Assem = ("D:\PowershellScripts\CsharpInPoweshellToPublish\ClassLib.dll")

$Source = @”
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ClassLib;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello world");
        }
        public static string GetName()
        {
            string namestr;
            Console.WriteLine("Enter your name: ");
            namestr = Console.ReadLine();
            return namestr;
        }
        public static void SetName(string namestr)
        {
            string outputstr="Name as input from Powershell: "+namestr;
            Console.WriteLine(outputstr);
        }
        public static void SetNameByGlobalVar()
        {
            Console.WriteLine("Name from a global variabel from Powershell: $Global:namestr");
        }
        public static void UseDllFromCS()
        {
            string namestr;
            string outputstr;

            namestr=Class1.retfromdll();
            outputstr="Return from Dll called from CS: "+namestr;
            Console.WriteLine(outputstr);
        }
    }
}

“@

#Import C# source code and load a dll
Add-Type -TypeDefinition $Source -Language CSharp -ReferencedAssemblies $Assem
[System.Reflection.Assembly]::LoadFrom("D:\PowershellScripts\CsharpInPoweshellToPublish\ClassLib.dll")

#CALL MAIN IN C#
[ConsoleApp.Program]::Main("test")

#Call a C# function without param and return a string
$NameFromCS=[ConsoleApp.Program]::GetName()
Write-Host "Name returned from CS: $NameFromCS"
Write-host "Type another name: "

#Call a C# function with a param
$NameFromPS=Read-Host
[ConsoleApp.Program]::SetName($NameFromPS)

#Call a C# function without param, but use a global declared variabel
[ConsoleApp.Program]::SetNameByGlobalVar()

#Call a C# function in a dll
$StringFromDll=[ClassLib.Class1]::retfromdll()
Write-Host "Name returned from dll: $StringFromDll"

#Call a C# function that call a function in a dll
[ConsoleApp.Program]::UseDllFromCS()
Listing 2 Powerhell code

The source code for the dll can be downloaded here. (as visual studio ce 2015 project)
The source code for the powershell script can be downloaded here.