主线程和子线程的区别

public delegate void dele();
    public partial class Form1 : Form
    {
        int idA;
        public dele getlab;
        public Form1()
        {
            InitializeComponent();
            idA  = Thread.CurrentThread.ManagedThreadId;//UI界面主线程
            /*
             * Main函数为主线程，id标示符与UI界面主线程相同。
             */
        }

        Thread thread;
        private void getbtu_Click(object sender, EventArgs e)//UI控件属于主线程
        {
            int idB = Thread.CurrentThread.ManagedThreadId;
            getlab = new dele(getLabel);//委托添加方法
            getlab += new dele(gg);//委托在叠加一个方法
            getlab += new dele(kk);//委托在叠加一个方法
            //
            thread = new Thread(new ThreadStart(delegate
            {
                int idC = Thread.CurrentThread.ManagedThreadId;//Thread开辟一个子线程
                //gg();//方法直接在thread里面调用均为子线程
                //kk();//方法直接在thread里面调用均为子线程
                getlab();//委托直接在thread里面调用，委托里面的方法为子线程

                //以上因为都包含在thread里面
                MessageBox.Show("显示完成");

                //this.Invoke(getlab);
                /*错误提示：主线程调用主线程当然会假死*/
            }));
            thread.IsBackground = true;
            thread.Start();
        }
        public void kk()//委托中的方法  委托方法三
        {
            int idR = Thread.CurrentThread.ManagedThreadId;
            this.Invoke((dele)(() =>//修改UI界面值则需要加this.Invoke
            {                 
                    label2.Text = "ABC";
            }));
        }
        public void gg()//委托中的方法  委托方法二
        {
            int idP = Thread.CurrentThread.ManagedThreadId;
            this.Invoke((dele)(() =>//修改UI界面值则需要加this.Invoke
            {
                    label3.Text = "QWE";
            }));
        }
        public void getLabel()//委托中的方法 委托方法一
        {       
            int idD = Thread.CurrentThread.ManagedThreadId;//子线程

            for (int i = 0; i <= 1000; i++)
            {
                Thread.Sleep(10);
                //this.Invoke为主线程，执行子线程的内容
                this.Invoke((dele)(() =>
                {
                    getlabel.Text = i.ToString();
                    int idE = Thread.CurrentThread.ManagedThreadId;//主线程
                    Console.WriteLine("线程idE:" + idE);
                }));
                Console.WriteLine(i);
            }
            MessageBox.Show("显示完成");
        }

        private void sleepbtu_Click(object sender, EventArgs e)//UI控件属于主线程
        {
            int idF = Thread.CurrentThread.ManagedThreadId;
            try
            {
                if (thread.ThreadState != ThreadState.Suspended)
                {
                    thread.Suspend();
                }
            }
            catch (Exception r)
            {
                MessageBox.Show(r.Message);
            }
        }

        private void setbtu_Click(object sender, EventArgs e)//UI控件属于主线程
        {
            int idG = Thread.CurrentThread.ManagedThreadId;
            try
            {
                if (thread.ThreadState != ThreadState.Running)
                {
                    thread.Resume();
                }
            }
            catch (Exception r)
            {
                MessageBox.Show(r.Message);
            }
        }

        public void getlabel_Click(object sender, EventArgs e)
        {

        }
    }