1.多线程操作 一旦打开线程就必须记得关闭

1.第一部分

这是个数字叠加小功能

private void CountTo(int countTo, CancellationToken ct)        {            int sum = 0;            for (; countTo > 0; countTo--)            {                if (ct.IsCancellationRequested)                {                    break;                }                sum += countTo;                //Invoke方法用于获得创建lbl_Status的线程所在的上下文                this.Invoke(new Action(() => textBox2.Text = sum.ToString()));                Thread.Sleep(200);            }        }

private CancellationTokenSource _cts;        private void button1_Click(object sender, EventArgs e)        {            _cts = new CancellationTokenSource();            ThreadPool.QueueUserWorkItem(state => CountTo(int.Parse(textBox1.Text), _cts.Token));        }

代码中Textbox1输入叠加数量的范围 ，textbox2 为显示Textbox

取消累加

private void button2_Click(object sender, EventArgs e)        {            if (_cts != null)                _cts.Cancel();        }

2.第二部分

这是个listbox 点击添加1.2.3.4.5。。。。。直到您点击停止

Thread[] workThreads = new Thread[1];   private void button3_Click(object sender, EventArgs e)        {            for (int i = 0; i < workThreads.Length; i++)            {                if (workThreads[i] == null)                {                    //如果线程不存在，则创建                      workThreads[i] = new Thread(new ThreadStart(DataGet));                    workThreads[i].Name = i.ToString();                    workThreads[i].Start();                }                else                {                    //已经存在，如果没有运行，则启动                      if (workThreads[i].ThreadState == ThreadState.Aborted || workThreads[i].ThreadState == ThreadState.Stopped)                    {                          workThreads[i] = new Thread(new ThreadStart(DataGet));                        workThreads[i].Name = i.ToString();                        workThreads[i].Start();                    }                    else                    {                        workThreads[i].Start();                    }                }            }          }

public void DataGet()          {            while (true)            {                if (listBox1.Items.Count > 0)                {                    int text = int.Parse(listBox1.Items[listBox1.Items.Count - 1].ToString()) + 1;                    AddItem(text.ToString());                    Thread.Sleep(1000);                }                                                }            //如果此方法退出了，那么这个线程也就退出了             }

private void AddItem(string text)        {            if (this.listBox1.InvokeRequired)            {                AddItemCallback d = new AddItemCallback(AddItem);                this.Invoke(d, new object[] { text });            }            else            {                this.listBox1.Items.Add(text);            }        }

 

关闭线程

private void button4_Click(object sender, EventArgs e)        {            this.listBox1.Items.Clear();            for (int i = 0; i < workThreads.Length; i++)            {                //如果线程存在，并且状态不是停止也不是终止的，则终止该线程                  if (workThreads[i] != null && workThreads[i].ThreadState != ThreadState.Stopped && workThreads[i].ThreadState != ThreadState.Aborted)                {                    workThreads[i].Abort();                }            }            this.listBox1.Items.Add("1");        }

3.第三部分是模仿着自己写的

//调取主板的声音        [DllImport("kernel32.dll", EntryPoint = "Beep")]        public static extern int Beep(int dwFreq, int dwDuration);

public void PLaySound()        {            for (int a = 1; a < 10; a++)            {                Beep(800, 1000);                Beep(500, 1000);            }            //thread.Join();        }

 

private void button5_Click(object sender, EventArgs e)        {                 thread = new Thread(new ThreadStart(PLaySound));                 thread.Start();         }

关闭进程

private void button6_Click(object sender, EventArgs e)        {            thread.Abort();        }

进程操作有很多种，仅供自己在编程时使用