winform 后台线程更新UI

//后台线程更新TextBoxprivate void SetTextBox(TextBox txt, string value){Action act = () =>{txt.Text = value;};if (txt.InvokeRequired){txt.Invoke(act);}else{act();}}private void TestThread(){int i = 0;while (true){Thread.Sleep(1000);i++;SetTextBox(textBox2,i.ToString());}}