C# 跨线程访问控件的解决方法

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //方法一：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;
        }

        //方法二：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) //等待异步
            {
                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();
            }
        }
    }