Task usage startup method example

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);
            }
        }
    }

　

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();
        }

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();

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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