private bool StartThreads()
        {
          
            bool IfTimesEnd = false;  
           
            IfRunOver = false;
         
     
            Thread newThread = new Thread(new ThreadStart(ThreadProc));
            newThread.Start();

            while (!IfRunOver)
            {                        
               
                IfTimesEnd = newThread.IsAlive;
                System.Windows.Forms.Application.DoEvents();
                if (!IfTimesEnd || IfRunOver)
                {
                    newThread.Interrupt();
                    newThread.Abort();
                    IfTimesEnd = false;
                    break;
                }
            }
            return !IfTimesEnd; 
          
        }

而主线程中的相关代码为：

                    while (true)
                    {
                        IfTimesEnd = StartThreads();
                        IfThreadOver = IfTimesEnd && true;
                        System.Windows.Forms.Application.DoEvents();

                        if (IfRunOver && IfThreadOver)
                        {
                            pt.Stop();
                            str = "用时:" + pt.Duration + " 秒\n";
                            richTextBox1.ScrollToCaret();
                            richTextBox1.AppendText(str);
                            richTextBox1.Update();
                            break;
                        }
                    }