Problem in calling a event from async method

Question

I have defined a delegate and event in the class like this:

public delegate void ResponseHandler();

event ResponseHandler^ responseEvent;

and then from a class method, I fired event as:

someAsyncFunction().then([this]()
 {
		
responseEvent();
		
});

From another place, I subscribed to the event as:

mWebServiceComponent->responseEvent += ref new WebServiceComponent::ResponseHandler([this]() {  });

But, this is not working and application raises an exception while calling the responseEvent. The exception is:

"Unhandled exception at 0x50CB9AD1 (msvcr110d.dll) in WWAHost.exe: An invalid parameter was passed to a function that considers invalid parameters fatal.

If there is a handler for this exception, the program may be safely continued."

This is really driving me crazy. What is wrong with this code? Could some please help!!

Thanks in advance.

Answer 1

Someone please reply! I am stuck!!!

Answer 2

You should turn on First chance exceptions (Debug > Exceptions...) in the debugger to see whether your code is throwing any other exceptions before the one you mentioned. Chances are that a C++ exception is trying to go over the ABI boundary and the process is terminated because of that. Only Platform::Exception exceptions are allowed to pass the ABI boundary.

Hope this helps,
Marian Luparu
Visual C++