public partial class Form1 : Form
    {
        CountdownEvent hander = new CountdownEvent(10);

        public static object lock_action = new object();
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 10; i++)
            {
                ThreadPool.QueueUserWorkItem(new WaitCallback(Run1), i);
            }
            textBox1.Invoke(new Action(() =>
            {
                textBox1.AppendText("按钮1执行完毕".Log());
            }));
        }
        private void button2_Click(object sender, EventArgs e)
        {
            
            //ThreadPool.SetMaxThreads(10, 30);
            for (int i = 0; i < 10; i++)
            {
                ThreadPool.QueueUserWorkItem(new WaitCallback(Run2), i);
            }
            hander.Wait();
            textBox1.AppendText("按钮2执行完毕".Log());
        }

        private void Run1(object str)
        {
            Thread.Sleep(1000);
            textBox1.AppendText(str.ToString().Log());
        }
        private void Run2(object str)
        {
            Thread.Sleep(1000);
            textBox1.AppendText(str.ToString().Log());
            hander.Signal();
        }
        

        
    }