Task usage startup method example-C#.Net Tutorial-php.cn

Task usage startup method example

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Release： 2017-06-23 16:15:35

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First, basic use

The difference between Thread, ThreadPool and Task

Task was added in .NET4.0 and has similar functions to the thread pool ThreadPool. When using Task to start a new task , the thread will be called from the thread pool, and Thread will create a new thread every time it is instantiated.

If it is a long-term operation, please use

TaskCreationOptions.LongRunning in the Task (Acton, TaskCreationOptions) constructor to imply the task scheduler and put this thread Execute on non-thread pool

The second and fourth startup methods

1) Start through start, new one Task, where the parameter is an Action

 class Program
    {
        static void Main(string[] args)
        {
            Task t = new Task(DoA);
            t.Start();
            Console.ReadKey();
        }
        static void DoA()
        {
            for (int i = 0; i < 100; i++)
            {
                Console.WriteLine("i={0}\n", i);
            }
        }
    }

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2) Run directly through Run, accept The parameter is an Action, and the return object is a Task

 static void Main(string[] args)
        {
            Task.Run(() =>
            {
                for (int i = 0; i < 50; i++)
                {
                    Console.WriteLine("i={0}",i);
                }
            });
            Console.ReadKey();
        }

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3) Thread with return parameters

   Task<int> task = Task.Run<int>(() =>
            {
                int sum = 0;
                for (int i = 0; i < 50; i++)
                {
                    sum += 1;
                }
                return sum;
            });
            int result = task.Result;
            Console.WriteLine("运算结果是：{0}",result);//输出50
            Console.ReadKey();

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4) Through Task.Factory

  Task t = Task.Factory.StartNew(() =>
              {
                  for (int i = 0; i < 10; i++)
                  {
                      Console.WriteLine("i={0}", i);
                  }
              });

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