从库调用时如何引发异常？

Question

I am defining a convention for the AutoMapping in Fluent NHibernate. From within this convention, I throw an exception:

public void Apply(IManyToManyCollectionInstance instance){
  ...
  if(<error>)
    throw new MappingException("Invalid Mapping");

  <doSomeStuff>
}

In another class, I initialize the configuration, resulting in the code above being executed:

public void init(){
  try{
    SessionFactory = configuration.BuildSessionFactory(); // Apply(...) will be called here
  }
  catch (MappingException ex)
  {
    <catchError>
  }

When <error> is true, <doSomeStuff> is highlighted by VisualStudio and I am warned that "MappingException was unhandled by user code".

Why is the exception not thrown until <catchError> ?

The Fluent NHibernate library is added by the NuGet package manager. If this is the reason that the exception is not forwarded, how can I send the MappingException to <catchError> ?

Answer 1

The reason for this behavior most likely is that you have checked the following option: Debug -> Exceptions -> Column "Thrown" for "Common Language Runtime Exceptions".

If you hit F5 or otherwise continue debugging, the code will eventually reach <catchError> .