C# WinForm窗体的多线程问题，多个用户控件界面开多个线程，多个线程之间来回跳跃

Question

各位大佬们，我想要做个下图的窗体，treeview有三个节点，每个节点调出一个用户控件，三个界面是一样的。

想要实现的功能是，点击开启线程，创建一个线程并调用计时器开始计时，计时器半秒给数值+1，关闭线程则丢弃线程。三个界面完全一致，但是发现三个界面的线程号会来回跳跃，说明线程一直在切换，而不是我想象中三个界面三个线程稳定执行。

UserControl的代码如下，三个界面一致。

请各位大佬指教，我的线程开闭有什么问题吗？怎么能实现我想要的功能呢？？

public partial class UserControl1 : UserControl
    {
        private Thread m_multiGetTestThread;
        private Boolean m_multiGetTestThreadStart = false;
        System.Timers.Timer myTimer;

        static int i = 0;
        public UserControl1()
        {
            InitializeComponent();
        }
        private void UserControl1_Load(object sender, EventArgs e)
        {
            int interval = 500;
            myTimer = new System.Timers.Timer(interval);
            myTimer.Elapsed += new System.Timers.ElapsedEventHandler(myTimer_tick);

            textBox3.Text = Thread.CurrentThread.ManagedThreadId.ToString();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (m_multiGetTestThreadStart == false)
            {
                m_multiGetTestThreadStart = true;
                m_multiGetTestThread = new Thread(connect);
                m_multiGetTestThread.Start();
                this.button1.Enabled = false;
            }
            textBox2.Text = m_multiGetTestThread.ThreadState.ToString();
            textBox3.Text = Thread.CurrentThread.ManagedThreadId.ToString();
        }

        private void connect()
        {
            i = 0;
            myTimer.Start();
        }
        private void myTimer_tick(object sender, EventArgs e)
        {
            textBox1.Text = i.ToString();            
            textBox2.Text = m_multiGetTestThread.ThreadState.ToString();
            textBox3.Text = Thread.CurrentThread.ManagedThreadId.ToString();
            i++;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            myTimer.Start();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            myTimer.Stop();
            textBox2.Text = m_multiGetTestThread.ThreadState.ToString();
            textBox3.Text = Thread.CurrentThread.ManagedThreadId.ToString();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            myTimer.Stop();
            m_multiGetTestThreadStart = false;
            m_multiGetTestThread.Abort();
            this.button1.Enabled = true;
            textBox2.Text = m_multiGetTestThread.ThreadState.ToString();
            textBox3.Text = Thread.CurrentThread.ManagedThreadId.ToString();
        }
    }
```**

Answer 1

没理解错的话
感觉像是这句的问题 Thread.CurrentThread.ManagedThreadId.ToString();