c# task run in background

最新推荐文章于 2024-01-09 18:44:59 发布

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本文介绍了一个使用C#实现的任务管理示例，展示了如何利用Task.Run启动后台任务，并通过async/await进行异步操作。文章强调了不要使用断点调试以免中断所有任务。演示了如何并行运行两个异步方法A和B，以及如何根据条件决定是否等待任务B完成。

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;
        }
    }
}