How to Call a function from a timer

Question

I want to call a function after an interval in uwp so I have this:

 private void TimedEvent()
        {
           aTimer = new System.Timers.Timer();
            aTimer.Interval = 40000;
           aTimer.Elapsed += new ElapsedEventHandler(PresencePage_Loaded);
            aTimer.AutoReset = true;

        }

 private async void PresencePage_Loaded(object sender, RoutedEventArgs e)
        {}

However I get a no overload for presencePage_loaded matches delegate ElapsedeventHandler error. Where am I going wrong?

Martin Costello · Accepted Answer · 2021-04-20 12:22:28Z

4

The signature of the ElapsedEventHandler delegate is:

public delegate void ElapsedEventHandler(object sender, ElapsedEventArgs e);

You need to change your method signature to match, so you need to change RoutedEventArgs to ElapsedEventArgs:

private async void PresencePage_Loaded(object sender, ElapsedEventArgs e)
{
}

answered Apr 20, 2021 at 12:22

Martin Costello

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1 Comment

MikeT Over a year ago

might cause more problems than it fixes as PresencePage_Loaded is the default for the loaded event so changing its signature will break the pages event

MikeT · Accepted Answer · 2021-04-20 12:37:54Z

3

Elapsed is declared as

public event System.Timers.ElapsedEventHandler Elapsed;

where as loaded is

public event System.Windows.RoutedEventHandler Loaded;

as the events have different types you can't use the handler for one as a handler for the other

the simplest option would be to pull your logic out of the handler into a function

public async Task DoSomething(){...}

then you can have 2 handlers that call this function ie

private async void Timer_Elapsed(object sender, ElapsedEventArgs e)
{
    await DoSomething();
}

private async void PresencePage_Loaded(object sender, RoutedEventArgs e)
{
    await DoSomething();
}

which would be attached as follows

aTimer.Elapsed += Timer_Elapsed;

edited Apr 20, 2021 at 12:37

answered Apr 20, 2021 at 12:31

MikeT

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