Program.cs

using IdleMon;
using CliWrap;
using Microsoft.Extensions.Logging.Configuration;
using Microsoft.Extensions.Logging.EventLog;
using System.Reflection;

if (args is { Length: >= 1 }) {
    string executablePath = Path.Combine(AppContext.BaseDirectory, "IdleMon.exe");
    switch(args[0].ToLower()) {
        case "/install":
            await IdleService.Uninstall();
            try {
                _ = await Cli.Wrap("sc")
                .WithArguments(new[] { "create", IdleService.SERVICE_NAME, $"binPath={executablePath}", "type=userown", "DisplayName=IdleMon", "start=auto" })
                .ExecuteAsync();
                Console.WriteLine("Successfully installed IdleMon service.");
            } catch (Exception ex) {
                Console.WriteLine($"Installation of IdleMon service failed: {ex}");
            }
            break;
        case "/uninstall":
            await IdleService.Uninstall();
            break;
        case "/report":
            Console.WriteLine(IdleService.GetIdleReport());
            break;
        case "/version":
            Console.WriteLine(Assembly.GetExecutingAssembly().GetName().Version ?? null);
            break;
        default:
            throw new NotImplementedException();
    }
    return;
}

HostApplicationBuilder builder = Host.CreateApplicationBuilder(args);
builder.Services.AddWindowsService(options => { options.ServiceName = IdleService.SERVICE_NAME; });
LoggerProviderOptions.RegisterProviderOptions<EventLogSettings, EventLogLoggerProvider>(builder.Services);
builder.Services.AddSingleton<IdleService>();
builder.Services.AddHostedService<WindowsBackgroundService>();

IHost host = builder.Build();
host.Run();