c# task run in background

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1. Task.Run will start to run in background

2. Don't use breakpoint to debug, or all tasks will be interupted.

using System;using System.Collections.Generic;using System.Linq;using System.Threading;using System.Threading.Tasks;namespace SystemTasks{    class TestTask    {        public static async Task<int> A(int upper)        {            for (int i = 0; i < upper; ++i)            {                await Task.Delay(1000);                Console.WriteLine("A: " + i);            }            return upper;        }        public static async Task<int> B(int upper)        {            for (int i = 0; i < upper; ++i)            {                await Task.Delay(1000);                Console.WriteLine("B: " + i);            }            return upper;        }        public static async Task<int> C()        {            int xx = 0;            var taskb = Task.Run(async () =>            {                Console.WriteLine("Start B:");                int b = await B(10);                Console.WriteLine("End B:");                return b;            });            int a = await A(5);            if (xx == 0)            {// xx == 0, taskb will run in background even if the function has returned.                 return a;            }            else            {                await taskb;                return taskb.GetAwaiter().GetResult();            }        }        static void Main()        {            C().GetAwaiter().GetResult();            Thread.Sleep(200000);   //If using breakpoint here, all threads will be interupted                         return;        }    }}

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