C#跨线程操作控件 无参数传递

      private void change()
        {
            this.label1.Text = "已发生变化";
        }
        private void threadchange()   //通过委托处理，MSDN上又很详细用法的说明
        {
            MethodInvoker In = new MethodInvoker(change);
            this.BeginInvoke(In);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Thread cha = new Thread(new ThreadStart(threadchange));
            cha.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Thread th = new Thread(change);//出现错误，不是主线程内调用。
            th.Start();
        }