c#如何跨线程调用窗体控件

public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            //方法1：不进行跨线程安全检查

            //System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;

        }

   

        private void button1_Click(object sender, EventArgs e)

        {

            Thread th1 = new Thread(new ThreadStart(CalNum));

            th1.Start();

        }

   

        private void CalNum()

        {

            //button1.Enabled = false;

   

            int result = 0;

            for (int i = 1; i < 100000000; i++)

            {

                result += i;

            }

   

            SetCalResult(result);

   

            //button1.Enabled = true;

        }

   

        //方法2：检查是否跨线程，然后将方法加入委托，调用委托

        public delegate void SetTextHandler(int result);

        private void SetCalResult(int result)

        {

            if (label2.InvokeRequired == true)

            {

                SetTextHandler set = new SetTextHandler(SetCalResult);//委托的方法参数应和SetCalResult一致

                label2.Invoke(set, new object[] { result }); //此方法第二参数用于传入方法,代替形参result

            }

            else

            {

                label2.Text = result.ToString();

            }

        }

    }