using System;
using System.Threading;
using System.Threading.Tasks;
 
class Program
{
    static void Main(string[] args)
    {
        var newDomain = AppDomain.CreateDomain("Worker domain");
        newDomain.DomainUnload += (o, e) =>
            Console.WriteLine($"App domain unload event in thread {Thread.CurrentThread.ManagedThreadId}, domain {AppDomain.CurrentDomain.FriendlyName}, at {DateTime.Now}");
 
        Task.Run(() =>
            {
                Thread.Sleep(1000);
                Console.WriteLine($"App domain killer in thread {Thread.CurrentThread.ManagedThreadId}, domain {AppDomain.CurrentDomain.FriendlyName}, at {DateTime.Now}");
                AppDomain.Unload(newDomain);
            });
 
        Worker remoteWorker = (Worker)newDomain.CreateInstanceAndUnwrap(
            typeof(Worker).Assembly.FullName, typeof(Worker).FullName);
        var result = remoteWorker.Work();
        Console.WriteLine(result);
    }
}
 
class Worker : MarshalByRefObject
{
    public int Work()
    {
        int result = 0;
        try
        {
            // nothing
        }
        finally
        {
            Console.WriteLine($"Worker.Work in thread {Thread.CurrentThread.ManagedThreadId}, domain {AppDomain.CurrentDomain.FriendlyName}, at {DateTime.Now}");
            for (int i = 0; i < 4; i++)
            {
                result += 1;
                Thread.Sleep(1000);
                Console.WriteLine($"Worker.Work in thread {Thread.CurrentThread.ManagedThreadId}, domain {AppDomain.CurrentDomain.FriendlyName}, at {DateTime.Now}");
            }
        }
        return result;
    }
}
 

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