Ardalis Blog

AsyncSandbox.cs

using System;
using System.Diagnostics;
using System.Threading.Tasks;

namespace AsyncSandbox
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var partyStatus = new PartyStatus();
            var timer = Stopwatch.StartNew();

            var sendInvites = SendInvites();
            var orderFood = OrderFood();
            var cleanHouse = CleanHouse();

            var useResult = true; // set this to true|false

            try
            {
                await Task.WhenAll(sendInvites, orderFood, cleanHouse)
                    .ContinueWith(async t =>
                    {
                        t.Exception.Handle(e => true);

                        if (useResult)
                        {
                            partyStatus.InvitesSent = sendInvites.Result;
                            partyStatus.FoodCost = orderFood.Result;
                            partyStatus.IsHouseClean = cleanHouse.Result;
                        }
                        else
                        {
                            partyStatus.InvitesSent = await sendInvites;
                            partyStatus.FoodCost = await orderFood;
                            partyStatus.IsHouseClean = await cleanHouse;
                        }
                    }).Unwrap();
            }
            catch (AggregateException)
            {
                Console.WriteLine("AggregateException");
            }
            catch (InvalidOperationException)
            {
                Console.WriteLine("InvalidOperationException");
            }

            Console.WriteLine($"Elapsed time: {timer.ElapsedMilliseconds}ms");
            Console.ReadLine();
        }

        public static async Task<int> SendInvites()
        {
            await Task.Delay(2000);
            throw new InvalidOperationException();

            return 100;
        }
        public static async Task<decimal> OrderFood()
        {
            await Task.Delay(2000);

            return 123.23m;
        }
        public static async Task<bool> CleanHouse()
        {
            await Task.Delay(2000);

            return true;
        }

        class PartyStatus
        {
            public int InvitesSent { get; set; }
            public decimal FoodCost { get; set; }
            public bool IsHouseClean { get; set; }
        }
    }
}