Metro JavaScript try/catch fails

Question

Anyone else having problems with try/catch in a Metro JavaScript app failing - i.e. catching no exceptions?  The first symptom is that the app blows up if you include standard jQuery, as jQuery depends on a functioning try/catch.  Also fails to catch an exception when calling a non-existent function on a winRT API object.  I'm surprised I haven't seen any complaints, as this is a complete show-stopper for any serious work.

Visual Studio standard JavaScript windows Metro Style Fixed Layout project.

Microsoft Visual Studio 11
Version 11.0.40825.2 PREREL
Microsoft .NET Framework
Version 4.5.65530 PREREL
Installed Version: Ultimate
Microsoft Visual C# 11 Developer Preview   01019-315-4422943-70030

Answer 1

Hi GlennW23,

Can you provide more details on the exceptions which aren't being caught? If I generate an exception in a try/catch block in a dummy function it gets caught as expected.

function button_click(e)
{
    try 
    {
        Debug.writeln("button_click");
        thisFunctionDoesNotExist();
     } 
    catch(ex)
    {
        Debug.writeln("caught exception: " + ex);
    }
}

Many people are using jQuery successfully in Metro style apps so there is likely something unusual about your specific scenario.

--Rob

Answer 2

Aha, I didn't understand what this line did:

// Uncomment the following line to enable first chance exceptions.
//Debug.enableFirstChanceException(true);

jQuery has a browser portability test in a try/catch that was firing and throwing into the debugger first with this uncommented.

Answer 3

Note that first chance exceptions are now enabled through Visual Studio, as described here: http://msdn.microsoft.com/en-us/library/windows/apps/6d156cff-36c6-425a-acf8-e1f02d4f7869#FirstChance.