Calling AppDomain.DoCallback from Powershell

Question

This is based on the Stack Overflow question: How to load an assembly as reflection-only in a new AppDomain?

I am attempting to determine the runtime version of an a

Answer 1

You can't run DoCallback via powershell alone. But DoCallBack does work with some inline C#. As Jeroen says it's ugly, but this works:

$assm = "C:\temp\so\bin\dynamic-assembly.dll"

Add-Type -TypeDefinition @"

using System.Reflection;
using System;

namespace Example
{


    public class AppDomainUtil
    {


        public void LoadInAppDomain(AppDomain childDomain, string assemblyName)
        {
            childDomain.SetData("assemblyName", assemblyName);

            childDomain.DoCallBack( new CrossAppDomainDelegate(LoadAssembly)) ;
        }

        public static void LoadAssembly() 
        {

            string assemblyName = (string)AppDomain.CurrentDomain.GetData("assemblyName");

            // console not available from another domain
            string log = "c:\\temp\\hello.txt";

            System.IO.File.WriteAllText(log, string.Format("Hello from {0}\r\n",AppDomain.CurrentDomain.FriendlyName));

            System.IO.File.AppendAllText(log, string.Format("Assembly to load is {0}\r\n",assemblyName));

            Assembly loaded = Assembly.Load(assemblyName);

            System.IO.File.AppendAllText(log, string.Format("Assemblyloaded: {0}\r\n",loaded.FullName));
        }

    }



}
"@ -OutputAssembly $assm -OutputType Library # must set output assembly otherwise assembly generated in-memory and it will break with Type errors.

Add-Type -Path $assm

function Load-AssemblyInNewAppDomain([string]$assembly) {

    Write-Host "Parent domain: $([AppDomain]::CurrentDomain.FriendlyName)"

    $util = New-Object Example.AppDomainUtil

    $ads = New-Object System.AppDomainSetup

    $cd = [AppDomain]::CurrentDomain

    # set application base 
    $ads.ApplicationBase =  [IO.path]::GetDirectoryName( $assm )

    [System.AppDomain]$newDomain = [System.AppDomain]::CreateDomain([System.Guid]::NewGuid().ToString(), $null, $ads);
    Write-Host "Created child domain: $($newDomain.FriendlyName)"

    $util.LoadInAppDomain($newDomain, $assembly)
}

Testing it out:

PS C:\WINDOWS\system32> Load-AssemblyInNewAppDomain "".GetType().Assembly.FullName

Parent domain: PowerShell_ISE.exe
Created child domain: 61ab2dbb-8b33-4e7e-84db-5fabfded53aa

PS C:\WINDOWS\system32> cat C:\temp\hello.txt

Hello from 61ab2dbb-8b33-4e7e-84db-5fabfded53aa
Assembly to load is mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Assemblyloaded: mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089