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   |  Thread update; public Form1() {     InitializeComponent();     update = new Thread(UpdateFunc); }
 
  void UpdateFunc() {     while (true)     {         Invoke(()=> label1.Text = DateTime.Now.ToString("HH:mm:ss"));         Invoke((string x)=> label1.Text = x + DateTime.Now.ToString("HH:mm:ss"),"时间:");         Thread.Sleep(500);     } }
 
 
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