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Exceptions in System.Timers.T imer.Elapsed event are ignored & not reported - desired behaviour?


I was testing this with .NET Framework 2.0.

Exceptions in the Elapsed event handler of a System.Timers.T imer are
ignored, they are not handled by the runtime and not reported (when
running outside of VS.NET) either. Ther Timer continues as if nothing
happened.
Is this the desired behaviour, because this would have very negative
impact on analysis of unexpected errors?
Am i missing any design directives concerining the exception handling
in a System.Timers.T imer object?

The following example demonstrates, what i am speaking of

using System;
using System.Timers;

class TimerTest
{
Timer myTimer;

public TimerTest() {
myTimer = new Timer(1000);
myTimer.Enabled = true;
myTimer.Elapsed += new ElapsedEventHan dler(myTimer_El apsed);
}

void myTimer_Elapsed (object sender, ElapsedEventArg s e) {
Console.WriteLi ne("TimerTest: Simulate an unexpected exception
....");
// Simulate unexpected exception ...
throw new Exception("Elap sed test exception.");
}
}

class Program
{
static void Main(string[] args) {
TimerTest timerTest = new TimerTest();
Console.WriteLi ne("TimerTest running. Press any key to
proceed");
Console.Read();
}
}

As already said, the exception is catched inside of VS.NET 2005 by the
Exception Assistant, when debugging.

Thanks & greets
brunft

Dec 14 '05 #1
0 1336

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