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post #361 of 1143
It's be useless, if I don't Task.Run it it doesn't show me the message box warning me of the exception. The exceptions handled anyways, but why?
post #362 of 1143
Quote:
Originally Posted by 3930K View Post

It's be useless, if I don't Task.Run it it doesn't show me the message box warning me of the exception. The exceptions handled anyways, but why?

Show me the code, trust me. If VS is breaking in to the debugger then the exception is not being handled correctly.
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post #363 of 1143
OK, then:
Code:
                try
                {
                    Task.Run(() => { try { someThing = XDocument.Load(SomeClass.Path, (LoadOptions.None)); } catch (Exception e) { throw e; } });
                }
                catch (Exception)
                {
                    return;
                }
post #364 of 1143
Quote:
Originally Posted by 3930K View Post

OK, then:
Code:
                try
                {
                    Task.Run(() => { try { someThing = XDocument.Load(SomeClass.Path, (LoadOptions.None)); } catch (Exception e) { throw e; } });
                }
                catch (Exception)
                {
                    return;
                }

Thanks smile.gif

No point re-throwing the exception - the Framework TPL will handle the exception for you and spit it out in your outer try...catch. Visual Studio breaks and throws up "user-handled" because, technically it IS unhandled by user-code; the framework caught the exception. However, exceptions will not be spun out to an outside handler unless you use async and await. Do the following:

1. Apply the "async" modifier to the parent method, and the caller method.
2. Modify the code to look like this:
Code:
async Task SomeMethod() /* Task is the same as "void" when using async */
{
                try
                {
                        await Task.Run( () =>
                                {
                                                someThing = XDocument.Load( SomeClass.Path, ( LoadOptions.None ) );
                                } );
                }
                catch (Exception)
                { /* Set a break-point here and press F5 once VS jumps in to the debugger - you'll notice the exception handler jumps here */ 
                    return;
                }
}

3. Change the caller to prefix "await" to the method, e.g. await SomeMethod()

---

Demonstrated with this test:
Code:
     static class Program
        {
                static void Main( string[] args )
                {
                        Task.Run( async () => await Test() );
                        Console.ReadLine();
                }

                static async Task Test()
                {
                        try
                        {
                                await Task.Run( () =>
                                        {
                                                throw new Exception();
                                        } );
                        }
                        catch ( Exception )
                        {
                                Console.WriteLine( "Exception caught" );
                        }

                        Console.ReadLine();
                }
        }

Async and await make exception handling MUCH easier when using the TPL. See here for info on handling exceptions when using the TPL - http://msdn.microsoft.com/en-us/library/dd997415.aspx
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post #365 of 1143
I have a problem: SomeMethod is in System.Xml.Linq :/
post #366 of 1143
Quote:
Originally Posted by 3930K View Post

I have a problem: SomeMethod is in System.Xml.Linq :/

How? SomeMethod is the method containing your code that you posted.
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post #367 of 1143
doh.gif

Brain-fart.
post #368 of 1143
Quote:
Originally Posted by 3930K View Post

doh.gif

Brain-fart.

tongue.gif
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post #369 of 1143
UGH. Now it's breaking at the Task.Run in SomeMethod.
post #370 of 1143
Quote:
Originally Posted by 3930K View Post

UGH. Now it's breaking at the Task.Run in SomeMethod.

That's fine - its supposed to happen.

"the Framework TPL will handle the exception for you and spit it out in your outer try...catch. Visual Studio breaks and throws up "user-handled" because, technically it IS unhandled by user-code; the framework caught the exception."

smile.gif
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