MicroAppExample

using Microsoft.Extensions.DependencyInjection;

namespace MicroAppExample;

public static class App
{
    private static object _syncLock = new();
    private static IServiceProvider? _serviceProvider = null;

    private static IServiceProvider BuildContainer()
    {
        ServiceCollection services = new();

        // Наполняешь DI.
        //services.AddSingleton<IService, Service>();
        //services.AddScoped<IService, Service>();

        return services.BuildServiceProvider();
    }

    public static TResult Run<TResult>(Func<IServiceProvider, TResult> appCode)
    {
        lock (_syncLock)
        {
            if (_serviceProvider is null)
            {
                _serviceProvider = BuildContainer();
            }
        }

        using var scope = _serviceProvider.CreateScope();

        return appCode(scope.ServiceProvider);
    }
}