只使用一次定时器(Using Timer only once)

 我想在主窗体初始化1秒后只使用一次定时器。 我认为以下内容会有一个消息框只说一次“Hello World”，但实际上每隔一秒新消息框就会显示“Hello World”。 
 
 为什么这样？ 我在tick事件中放置了t.Stop() 。 另外，我是否需要以某种方式处理计时器以避免内存泄漏？ 
 
        Timer t = new Timer();
        t.Interval = 1000;                
        t.Tick += delegate(System.Object o, System.EventArgs e)
                        { MessageBox.Show("Hello World"); t.Stop(); };

        t.Start();   
 
 请帮助并显示是否有更好的方法来做到这一点？ 谢谢。 

I want to use a timer only once, at 1 second after the initialization of my main form. I thought the following would have a message box saying "Hello World" just once, but actually a new message box says "Hello World" every one second.
 
Why so? I had put t.Stop() in the tick event. Also, do I need to dispose the timer somehow to avoid memory leakage?
 
        Timer t = new Timer();
        t.Interval = 1000;                
        t.Tick += delegate(System.Object o, System.EventArgs e)
                        { MessageBox.Show("Hello World"); t.Stop(); };

        t.Start();   
 
Please help and show if there is a better way of doing this? Thanks.

原文：https://stackoverflow.com/questions/2841177