多线程个人笔记

当创建的线程操作界面上的控件的时候，会抛出入校异常　　　　
　　Cross-thread operation not valid: Control 'tbNumb' accessed from a thread other than the thread it was created on.
虽然可以通过这样来解决：TextBox.CheckForIllegalCrossThreadCalls = false;
但是不推荐这样做，微软推荐的做法如下：


//定义一个委托用于将值设置到文本框中
        delegate void SetTextToControl_del(int n);
        SetTextToControl_del delTextToControl = null;
        private void btnStart_Click(object sender, EventArgs e)
        {
            //将委托指向方法SetValueToControl
            delTextToControl = SetValueToControl;
            //新建一个线程来执行数数
            Thread t = new Thread(new ThreadStart(CountNumb));
            t.IsBackground = true;
            t.Start();
        }
        private void CountNumb()
        {
            for (int i = 0; i < 50000; i++)
            {
                tbNumb.Invoke(delTextToControl, i);　　//重点在这里
            }
        }
        /// <summary>
        /// 将传递过来的值存放到文本框中
        /// </summary>
        /// <param name="n"></param>
        private void SetValueToControl(int n)
        {
            tbNumb.Text = n.ToString();
        }