System.Timer.Timer先执行后等待

[hyunwung]

System.Timer.Timer控件的问题。

        System.Timers.Timer aTimer = new System.Timers.Timer();

        // Hook up the Elapsed event for the timer.
        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

        // Set the Interval to 2 seconds (2000 milliseconds).
        aTimer.Interval = 2000;
        aTimer.Enabled = true;

        Console.WriteLine("Press the Enter key to exit the program.");
        Console.ReadLine();

        // Keep the timer alive until the end of Main.
        GC.KeepAlive(aTimer);

尝试了一下，timer是在线等待2秒之后，去执行的回调函数。启动->(2秒后)->执行OnTimedEvent函数->然后每隔两秒执行一次。

想问的是，可不可以让timer启动就去执行回调函数，然后再开始重复。就是：启动->执行OnTimedEvent函数->(2秒后)->然后每隔两秒执行一次。

[loveAllenSu]

看的都头大！哈哈

[hyunwung]

有说system.thread.timer能够控制是先等待还是先执行……？

[gomoku]

OnTimedEvent(this, ElapsedEventArgs.Empty); //C#在这一句报错了，this指代不明，还有，ElapsedEventArgs向EvenArgs型转化失败

OnTimedEvent(null, null);                         // it doesn't matter if you don't use those parameters
OnTimedEvent(null, ElapsedEventArgs.Empty);       // dittto

[jin1002]

那改用线程吧
就可以先执行再等待了

[freeboy827]

System.Timers.Timer aTimer = new System.Timers.Timer();
初始化时写好参数就行了，不要用无参数的构造函数

[gomoku]

       System.Timers.Timer aTimer = new System.Timers.Timer();

        // Hook up the Elapsed event for the timer.
        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

        // Set the Interval to 2 seconds (2000 milliseconds).
        aTimer.Interval = 2000;
        aTimer.Enabled = true;
        OnTimedEvent(this, ElapsedEventArgs.Empty);                        // <----

        Console.WriteLine("Press the Enter key to exit the program.");
        Console.ReadLine();

        // Keep the timer alive until the end of Main.
        GC.KeepAlive(aTimer);

[hyunwung]

    // Specify what you want to happen when the Elapsed event is 
    // raised.
    private static void OnTimedEvent(object source, ElapsedEventArgs e)
    {
        Console.WriteLine("Hello World!");
    }

[hyunwung]

不太明白gomoku的意思。OnTimedEvent是我写在外面的函数，
OnTimedEvent(this, ElapsedEventArgs.Empty);是什么意思

[gomoku]

...OnTimedEvent是我写在外面的函数，...
函数, so why don't you call it once at the begining?

[hyunwung]

[Quote=引用 5 楼 gomoku 的回复:]
...OnTimedEvent是我写在外面的函数，...
函数, so why don't you call it once at the begining?
[/Quote]
如上所说不是不行，不过投机取巧了，不是我想要的结果。

[gomoku]

[Quote=引用 6 楼 hyunwung 的回复:]
如上所说不是不行，不过投机取巧了，不是我想要的结果。
[/Quote]

So what is the difference?
You've got what you want.

[hyunwung]

[Quote=引用 7 楼 gomoku 的回复:]
引用 6 楼 hyunwung 的回复:
如上所说不是不行，不过投机取巧了，不是我想要的结果。


So what is the difference?
You've got what you want.
[/Quote]
by my words, how do you know this answer is what i want.
actrually, it's not.i want to know how to set "timer" options to what i want

[gomoku]

[Quote=引用 8 楼 hyunwung 的回复:]
So what is the difference?
You've got what you want.

by my words, how do you know this answer is what i want.
actrually, it's not.i want to know how to set "timer" options to what i want
[/Quote]

Sure, that is your program :-)

[Macosx]

楼主要求的不是正常的用法　所以任何解决方法都是取巧的　那还问大家干啥

[hyunwung]

[Quote=引用 10 楼 Macosx 的回复:]
楼主要求的不是正常的用法　所以任何解决方法都是取巧的　那还问大家干啥
[/Quote]
也就是说，timer只能是先等待，然后再执行，我说的用timer属性控制是无法实现的？？

[hyunwung]

using System;
using System.Timers;

public class Timer1
{
    public static void Main()
    {
        System.Timers.Timer aTimer = new System.Timers.Timer(20000);

        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
        aTimer.Enabled = true;
        
        OnTimedEvent(this, ElapsedEventArgs.Empty);  //C#在这一句报错了，this指代不明，还有，ElapsedEventArgs向EvenArgs型转化失败

        Console.WriteLine("Press the Enter key to exit the program.");
        Console.ReadLine();
        GC.KeepAlive(aTimer);
    }

    private static void OnTimedEvent(object source, ElapsedEventArgs e)
    {
        Console.WriteLine("Hello World!");
    }
}

[GhostAdai]

[Quote=引用 6 楼 hyunwung 的回复:]
引用 5 楼 gomoku 的回复:
...OnTimedEvent是我写在外面的函数，...
函数, so why don't you call it once at the begining?

如上所说不是不行，不过投机取巧了，不是我想要的结果。
[/Quote]

晕，很多算法都是投机取巧的，能出来就行了，何必执着呢？