Continued: Elusive Exception, Part 2
I am writing a custom binding mechanism; My converter is called before the DataContext is set for the target element. This alone does not really matter, because it will be updated when the DataContext ultimately gets the value. What causes the problems is the NullReferenceException, which I get because the DataContext is null, which doesn't seem to want to be caught.
Despite the fact that I'm trying to catch an exception in the value converter:
try { return ( (MethodInfo)_member ).Invoke( parameter, null ); } catch { return null; }
For some reason, the debugger still stops at this point.
(This backs up the stack trace a little to where the catch block is located - the actual exception occurs inside the _member method. The weird part is that the catch block is inactive, but the breakpoint is never reached.)
Now I think that this may be due to the fact that the exception occurs in another assembly, from where it is caught (I try to pack this into the reusable class library, and _member above points to the method in the application assembly).
If I run my small test application without a debugger, it works fine, however, my application is a little more robust and has general exception handling, which starts because of this.
I am wondering if there is any attribute or something (or maybe some reflection parameter that I skip?) That I can use so that the exception is caught, as it should be.
Update: I am pretty sure that this should be due to the reflection and use of MethodInfo.Invoke. It appears that the exception is the first of "TargetInvocationException" with an internal exception from NullReferenceException. It seems that the call exception somehow happens outside the call stack and therefore is not intercepted inside it. I am not doing anything with threads, but maybe some implicit thread offset is happening inside MethodInfo.Invoke?
Does anyone have any ideas how I could get this to be caught, or perhaps another way to call a method from a method name that won't have this problem? I am partly in a dead end.