线程无法启动后线程Sleeep

Question

在这我使用秒表。当0之间秒表值至15就会起到在屏幕1的视频和15后，将在屏幕上显示0但线程中执行Thread.sleep()

public partial class Form2 : Form 
{ 
    int[] screentimings = new int[2] { 20, 20 }; 
    Stopwatch sp; 
    Thread thread1; 
    //private System.Timers.Timer _timer = new System.Timers.Timer(); 

    public Form2() 
    { 
     InitializeComponent(); 
     thread1 = new Thread(new ThreadStart(A)); 
     thread1.SetApartmentState(ApartmentState.STA); 
     sp = new Stopwatch(); 
     sp.Start(); 
     thread1.Start();   
    } 
     [STAThread] 
    public void showOnMonitor(int showOnMonitor) 
    { 
     Screen[] sc; 
     sc = Screen.AllScreens; 
     Form1 f = new Form1(); 
     f.FormBorderStyle = FormBorderStyle.None; 
     f.Left = sc[showOnMonitor].Bounds.Left; 
     f.Top = sc[showOnMonitor].Bounds.Top; 
     f.Height=sc[showOnMonitor].Bounds.Height; 
     f.Width=sc[showOnMonitor].Bounds.Width; 
     f.StartPosition = FormStartPosition.Manual; 
     f.ShowDialog(); 
    } 

    [STAThread] 
    private void A() 
    { 
     long i = sp.Elapsed.Seconds; 
     if (i > 0 && i < 15) 
     { 
      showOnMonitor(1); 
     } 
     else 
     { 
      showOnMonitor(0); 
     } 
     Thread.Sleep(500); 
    } 
} 

showOnMonitor（1）代码之后，但15秒后没有启动showOnMonitor （0）不起作用。 我是新的线程不知道什么是错的。这可能是因为[STAThread]没有它给单线程异常。

Answer 1

你并不需要一个线程都没有。线程用于同时执行多个操作。解释它将超出这个问题的范围。请阅读有关线索here的更多信息。

既然你是在.Net 4.5中，你可以使用async/await来很容易地完成你的目标。

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

    protected async override void OnLoad(EventArgs e) 
    { 
     base.OnLoad(e); 
     await ShowForms();//Show the forms 
    } 

    private async Task ShowForms() 
    { 
     ShowOnMonitor(1); 
     await Task.Delay(15000);//15 seconds, adjust it for your needs. 
     ShowOnMonitor(2); 
    } 

    private void ShowOnMonitor(int showOnMonitor) 
    { 
     Screen[] allScreens = Screen.AllScreens; 
     Rectangle screenBounds = allScreens[showOnMonitor - 1].Bounds; 
     Form1 f = new Form1 
     { 
      FormBorderStyle = FormBorderStyle.None, 
      Left = screenBounds.Left, 
      Top = screenBounds.Top, 
      Height = screenBounds.Height, 
      Width = screenBounds.Width, 
      StartPosition = FormStartPosition.Manual 
     }; 
     f.Show();//Use show, not ShowDialog. 
    } 
}