如何在x秒后触发方法运行？

Question

我正在使用C#Windows窗体应用程序,我需要该方法暂停30秒,直到它继续到下一行代码.我试过Thread.Sleep()哪个不适合这个应用程序,我知道我应该使用某种计时器代替.我搜索了很多,但我无法弄清楚如何实现计时器.

我的代码在下面,任何人都可以告诉我应该如何实现计时器.我已经评论了我希望方法暂停的位置.

private void start_Vid_Click(object sender, EventArgs e)
{
    if (video.State != StateFlags.Running)
    {
        viewport.Visible = true;
        video.Play();
    }

    //Here I want to wait 30 seconds until the next line of code is triggered

    viewport.Visible = false;
    viewport2.Visible = true;
    pictureBox1.Visible = true;
    start_Webc(); 
    video2.Play();
}

Answer 1

如果您的应用是.Net 4.5应用程序,那么它使用起来会更容易一些Task:

private async void start_Vid_Click(object sender, EventArgs e)
{
    if (video.State != StateFlags.Running)
    {
        viewport.Visible = true;
        video.Play();
    }

    await Task.Delay(TimeSpan.FromSeconds(30));

    viewport.Visible = false;
    viewport2.Visible = true;
    pictureBox1.Visible = true;
    start_Webc();
    video2.Play();
}

Answer 2

Task.Delay在.NET 4.0上不可用,但您可以启动任务,它将只睡眠30秒,之后您可以再次继续使用UI线程:

Task.Factory.StartNew(() => Thread.Sleep(30 * 1000))
            .ContinueWith((t) =>
    {
         viewport.Visible = false;
         viewport2.Visible = true;
         pictureBox1.Visible = true;
         start_Webc(); 
         video2.Play();
    }, TaskScheduler.FromCurrentSynchronizationContext());

Answer 3

System.Threading.Tasks.Task.Delay( 60 * 1000 ).ContinueWith( (_) => StartVoid() );

Answer 4

在类级别定义一个实例Timer（有一些这样的类 - 对于 winforms 应用程序，您应该使用System.Windows.Forms.Timer）

static System.Windows.Forms.Timer myTimer = new System.Windows.Forms.Timer();

然后在您的方法中添加行来处理其刻度并启动它：

private void start_Vid_Click(object sender, EventArgs e)
{
    if (video.State != StateFlags.Running)
    {
        viewport.Visible = true;
        video.Play();
    }

    myTimer.Tick += (o,ea) => {    
        viewport.Visible = false;
        viewport2.Visible = true;
        pictureBox1.Visible = true;
        start_Webc(); 
        video2.Play();
        myTimer.Stop();
    }
    myTimer.Interval = 5000; // 5 seconds
    myTimer.Start();
}