winform程序backgroundworker或者异步中修改控件内容需要判断控件的InvokeRequired

winform程序backgroundworker或者异步中修改控件内容需要判断控件的InvokeRequired，然后使用委托执行更改控件内容的操作。
代码

using System;
using System.Threading;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            new Thread(Work).Start();//开启线程不卡死主线程
        }

        private void Work()
        {
            Thread.Sleep(5000);
            string msg = "abcdefg";
            UpdateMsg(msg);
        }

        private void UpdateMsg(string msg)
        {
            if (this.txtwords.InvokeRequired)
            {
                Action<string> action = UpdateMsg;
                this.Invoke(action, msg);
                return;
            }
            this.txtwords.Text = msg;
        }
    }
}