C# 本进程执行完毕后再执行下一线程

　　最近做了一套MES集成系统，由上料到成品使自动化运行，其中生产过程是逐步的，但是每一个动作都需要独立的线程进行数据监听，那么就需要实现线程等待。

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Forms
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        } 

        CountdownEvent latch ;
        private void refreshData(CountdownEvent latch)
        {
            latch.Signal();
        }

        delegate void UpdateText(Control control, string text);
        UpdateText color = delegate (Control control, string text)
        {
            control.Text = text;
        };

        private void button1_Click(object sender, EventArgs e)
        {
            Thread th = new Thread(ProcessMain);
            th.IsBackground = true;
            th.Start();
        }

        /// <summary>
        /// 主线程函数
        /// </summary>
        void ProcessMain()
        {
            Process("");
            Process("");
            Process("");
            MessageBox.Show("全部执行完毕");
        }

        /// <summary>
        /// 动作
        /// </summary>
        void Process(string value)
        {
            latch = new CountdownEvent();
            Thread thread = new Thread(() => {
                bool flag = true;
                int i = ;
                while (flag)
                {
                    if (i > )
                    {
                        flag = false;
                    }
                    i++;
                    Thread.Sleep();
                }
                refreshData(latch);
            });
            thread.Start();
            latch.Wait();
            this.Invoke(color, new object[] { textBox1, value });
        }
    }
}

多个线程全部执行完毕后再调用方法：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ExecutionCourseSystem
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        CountdownEvent latch = new CountdownEvent();
        private void Form3_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Thread thread = new Thread(() => refreshData());
            thread.Start();
            thread = new Thread(() => refreshData());
            thread.Start();
            thread = new Thread(() => refreshData());
            thread.Start();
            thread = new Thread(() => refreshData());
            thread.Start();
            thread = new Thread(() => refreshData());
            thread.Start();
            latch.Wait();
            MessageBox.Show("线程全部执行完毕");
        }
        private void refreshData()
        {
            latch.Signal();
        }
    }
}