public class MyStatefulService : StatefulService
{
    ...
    
    protected override IEnumerable<ServiceReplicaListener> CreateServiceReplicaListeners()
    {
        // Build an ASP.NET 5 web application that serves as the communication listener.
        var webApp = new WebApplicationBuilder().UseConfiguration(WebApplicationConfiguration.GetDefault())
                                                .UseStartup<Startup>()
                                                .ConfigureServices(services => services.AddSingleton<MyStatefulService>(this))
                                                .Build();

        // Replace the address with the one dynamically allocated by Service Fabric.
        var endpoint = ServiceInitializationParameters.CodePackageActivationContext.GetEndpoint("WebTypeEndpoint");
        webApp.GetAddresses().Clear();
        webApp.GetAddresses().Add($"{endpoint.Protocol}://+:{endpoint.Port}");

        return new[] { new ServiceReplicaListener(_ => new AspNetCommunicationListener(webApp)) };
    }
}

public class AspNetCommunicationListener : ICommunicationListener
{
    private IWebApplication _webApp;
    private IDisposable _token;

    public AspNetCommunicationListener(IWebApplication webApp)
    {
        _webApp = webApp;
    }

    public void Abort()
    {
        _token?.Dispose();
    }

    public Task CloseAsync(CancellationToken cancellationToken)
    {
        _token?.Dispose();

        return Task.FromResult(true);
    }

    public Task<string> OpenAsync(CancellationToken cancellationToken)
    {
        _token = _webApp.Start();

        return Task.FromResult(_webApp.GetAddresses().First());
    }
}