BackgroundWorker

 class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("Main(string[] args)方法中：当前执行的线程编号：{0}", Thread.CurrentThread.ManagedThreadId);

            //BackgroundWorker
            //创建一个后台执行者对象
            BackgroundWorker backWorker = new BackgroundWorker();
            //设置该对象要在后台执行的方法
            backWorker.DoWork += new DoWorkEventHandler(backWorker_DoWork);

            //设置另外一个事件：当程序执行完毕后触发的事件
            backWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backWorker_RunWorkerCompleted);

            //开始执行
            backWorker.RunWorkerAsync(new int[] { 1, 100 });
            Console.WriteLine("主线程继续.......");
            Console.ReadKey();
        }
        //当后台方法执行完毕后触发的事件
        static void backWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            Console.WriteLine("backWorker_RunWorkerCompleted方法中：当前执行的线程编号：{0}", Thread.CurrentThread.ManagedThreadId);
            Console.WriteLine("最后输出结果是：{0}", e.Result);
        }


        //要在后台执行的方法
        static void backWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            Console.WriteLine("backWorker_DoWork方法中：当前执行的线程编号：{0}", Thread.CurrentThread.ManagedThreadId);
            if (e.Argument != null)
            {
                int[] arr = e.Argument as int[];
                //把方法调用完毕后的值赋值给e.Result
                e.Result = Sum(arr[0], arr[1]);
            }

        }
        static int Sum(int from, int to)
        {
            int sum = 0;
            for (int i = from; i <= to; i++)
            {
                sum += i;
            }
            return sum;
        }
    }