namespace 多线程

{

    public partial class Form2 : Form

    {

        public Form2()

        {

            InitializeComponent();

        }  

        private void Form2_Load(object sender, EventArgs e)

        {

            //1.New 一个thread.

            //给新创建的thread绑一个带参的方法ParameterizedThreadStart

            new Thread((ParameterizedThreadStart)(Dosomething)).Start();

            //如果绑的是无参的方法，就用ThreadStart

            //new Thread((ThreadStart)(Dosomething)).Start();  

            //2.在线程池里面做.

            ThreadPool.QueueUserWorkItem(new WaitCallback(Dosomething));  

            //3.用backgroundworker

            using (BackgroundWorker bw = new BackgroundWorker())

            {

                bw.DoWork += new DoWorkEventHandler(bw_DoWork);

                bw.RunWorkerAsync();

            }

        }  

        private void bw_DoWork(object sender, DoWorkEventArgs e)

        {

            Dosomething("");

        }  

        private void Dosomething(object o)

        {

            var text = "跨线程设值";

            UpdateTextboxText(text);

        }  

        private void UpdateTextboxText(string text)

        {

            if (this.InvokeRequired)

            {

                //this.Invoke((EventHandler)(SetText),new object[] {text});

                //this.Invoke((MethodInvoker)(delegate { textBox1.Text = text; }));

                this.Invoke((Action)( delegate {UpdateTextboxText(text);}));

                //其中Action,MethodInvoker,Func<>,EventHandler都是系统定义好的委托类型

            }

            else

            {

                textBox1.Text = text;

            }

        }

    }

}