dev/csharp/Dotnetservice/Program.cs

// ==============================================================================================
// For testing windows service with .NET 5
// Source: https://stackoverflow.com/questions/7764088/net-console-application-as-windows-service
// ==============================================================================================


using System.ServiceProcess

public static class Program
{
    #region Nested classes to support running as service
    public const string ServiceName = "MyService";

    public class Service : ServiceBase
    {
        public Service()
        {
            ServiceName = Program.ServiceName;
        }

        protected override void OnStart(string[] args)
        {
            Program.Start(args);
        }

        protected override void OnStop()
        {
            Program.Stop();
        }
    }
    #endregion
    
    static void Main(string[] args)
    {
        if (!Environment.UserInteractive)
            // running as service
            using (var service = new Service())
                ServiceBase.Run(service);
        else
        {
            // running as console app
            Start(args);

            Console.WriteLine("Press any key to stop...");
            Console.ReadKey(true);

            Stop();
        }
    }
    
    private static void Start(string[] args)
    {
        // onstart code here
    }

    private static void Stop()
    {
        // onstop code here
    }
}