DispatcherTimer.TickはEventHandlerではなくEventHandler<object>です。

これを正しく指定するには、コードを変更する必要があります。

 timer.Tick += new EventHandler(timer_Tick);

これは短い形式でも記述できることに注意してください。これは通常、より安全です。

timer.Tick += timer_Tick;

Delegate types are not required when attaching events, the compiler can figure it out for you. Try this instead:

timer.Tick += timer_Tick;

As for why you get the error currently, the EventHandler delegate is declared like this:

public delegate void EventHandler<TEventArgs>(
    Object sender,
    TEventArgs e
)

This means the type you put in the brackets represents the second argument in the function.

So when you type EventHandler<object>, the compiler looks for a function like timer_Tick(Object sender, object e) which it does not find, hence the error. To use the full delegate type, it would have to be EventHandler<EventArgs>

Instead of new EventHandler<object>, do new EventHandler. Or alternatively just put += timer_Tick;.

I solved the same issue with two small changes:

1) Change second argument to type object:

INSTEAD OF THIS:

private void timer_Tick(object sender, EventArgs e)

USE THIS:

private void timer_Tick(object sender, **object** e)

2) Simplify the

INSTEAD OF THIS:

timer.Tick += new EventHandler<object>(timer_Tick);

USE THIS:

timer.Tick += timer_Tick;  // as suggested by WildCrustacean above