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


//在单步调试过程中，实际上单击挂起线程按钮时，还未执行函数内的语句，t.ThreadState的值已经变成Stopped。为什么呢？

namespace thread_state
{
    public partial class Form1 : Form
    {
        private Thread t;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Sample st = new Sample(listBox1);   //实例化Sample类      
            t = new Thread(new ThreadStart(st.work));      //创建Thread对象

            System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;     //注销此语句会出现错误，不知道为啥

        }

        
        private void button1_Click_1(object sender, EventArgs e)
        {
            t.Start();
            button1.Enabled = false;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (t.ThreadState == ThreadState.Running)      //线程已启动，它未被阻塞，并且没有挂起的 ThreadAbortException。
            {
                t.Suspend();       //挂起线程

              // listBox1.Items.Add("线程已挂起");
            button2.Enabled = false;
            button3.Enabled = true;
            }
            
            
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (t.ThreadState == ThreadState.Suspended)    //如果线程已挂起
            {
                t.Resume();                                //继续已挂起的线程
                button2.Enabled = true;
                button3.Enabled = false;
                //listBox1.Items.Add("线程已恢复");
            }
            
            
        }

        private void button4_Click(object sender, EventArgs e)
        {
            if (t.IsAlive & t.ThreadState == ThreadState.Running)  //IsAlive :如果此线程已启动并且尚未正常终止或中止，则为 true；否则为 false。

            {
                t.Abort();   
                listBox1.Items.Add("线程已停止");         
                button2.Enabled = false;
                button3.Enabled = false;
                button4.Enabled = false;            
            }
           
        }
    }

    public class Sample
    {
        private System.Windows.Forms.ListBox listBox1;

        public Sample(System.Windows.Forms.ListBox a)
        {
            this.listBox1 = a;
        }
        public void work()
        {
            listBox1.Items.Add("Sample 的 work 线程正在运行");

        }

    }
}


//  在单步调试时，发现：单击按钮事件的if条件{ 。。。}括号的语句未被 执行，就是单击按钮时，线程的状态t.Thread直接就变成Stopped了，不知道为什么？？？

看了，但不知道

单击按钮事件已不在线程的生命周期内，肯定是终止，如果要实现你的这种功能可以试试Timer

System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;//这句是不检查跨线程调用控件
Sample类中的work函数在线程中直接调用控件,要引发异常,应该用委托
private delegate void AddItem(ListBox lb);
this.Invoke(new AddItem(st.work), new object[] { this.listBox1});
线程的状态t.Thread直接就变成Stopped了是因为t线程执行work函数瞬间就完了,线程就退出了,再操作它是不不对的

新学C#，基础篇还没看完，好多问题不是很懂。