Loading/Injecting .Net Assembly into existing .net process?

Question

In my situation i want to load a custom .net assembly into a running .net process\'s domain, for example Windows Explorer, What i have tried already is just injecti

Answer 1

As another option you can use existing library - ManagedInjector - https://github.com/cplotts/snoopwpf/tree/master/ManagedInjector . There is a tool snoopwpf that can show details of any WPF process, and it uses process injection for that. I used it some time ago and it worked well.

You need to build it, add to your project as reference and call like this:

Injector.Launch(someProcess.MainWindowHandle, 
                  typeof(Loader).Assembly.Location, 
                  typeof(Loader).FullName, 
                  "Inject");

Loader is name of type that will be loaded into process and Inject is a static method that will be executed. In my case i had:

public class Loader
{

    public static void Inject()
    {
          // i did CBT Hook on main window here 
          // and also displayed sample message box for debugging purposes
          MessageBox.Show("Hello from another process");
    }
}

That ManagedInjector is written in Managed C++ code. Basically it hooks own unmanaged C++ method as MessageHookProc and it will start specified assembly after injection and run specified method. It should work fine for both managed and unmanaged programs. In my case i used it for unmanaged program.

UPDATE

I tested it locally and it successfully injects my message box into explorer process under Windows 8.1 x64. I compiled ManagedInjector64-4.0 and my sample console project also has x64 in platform selection. Here is my working code:

class Program
{
    static void Main(string[] args)
    {
        var proc = Process.GetProcessesByName("explorer").FirstOrDefault();
        Injector.Launch(proc.MainWindowHandle, typeof(Loader).Assembly.Location, typeof(Loader).FullName, "Inject");
    }
}

public class Loader
{
    public static void Inject()
    {
        MessageBox.Show("Hello");
        Task.Run(() =>
        {
            Thread.Sleep(3000);
            MessageBox.Show("Hello again");
            Thread.Sleep(5000);
            MessageBox.Show("Hello again again");
        });
    }
}