HomeController.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Orleans.AspNetCore.Demo.Grains;

namespace Orleans.AspNetCore.Demo.Controllers
{
    public class HomeController : Controller
    {
        private readonly IClusterClient _clusterClient;

        public HomeController(IClusterClient clusterClient)
        {
            _clusterClient = clusterClient;
        }

        public async Task<IActionResult> Index()
        {
            var orderNumberGenerator = _clusterClient.GetGrain<IOrderNumberGenerator>("Demo");
            var orderNumber = await orderNumberGenerator.GenerateOrderNumber();
            return View(orderNumber);
        }
    }
}