C# Task的三种启动方法

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

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            var timer = Stopwatch.StartNew();
            Task taskA = new Task(MethodA);
            taskA.Start();
            Task taskB = Task.Factory.StartNew(MethodB);
            Task taskC = Task.Run(new Action(MethodC));

            Task[] tasks = { taskA, taskB, taskC };

            Task.WaitAll(tasks);

            Console.WriteLine($"{timer.ElapsedMilliseconds:#.##0}ms elapesed");

        }


        static void MethodA()
        {
            Console.WriteLine("Starting method A");
            Thread.Sleep(3000);
            Console.WriteLine("Finished method A");
        }

        static void MethodB()
        {
            Console.WriteLine("Starting method B");
            Thread.Sleep(2000);
            Console.WriteLine("Finished method B");
        }

        static void MethodC()
        {
            Console.WriteLine("Starting method C");
            Thread.Sleep(1000);
            Console.WriteLine("Finished method C");
        }
    }
}