Detect when running inside a catch block

Question

How do I detect when the currently-executing code is being called from within a catch block?

void SomeFunction()
{
    // how do I detect whether I am being called from within a catch block?
}

EDIT:

For those asking, I wanted to implement a class like this, never mind the error bubbling logic: On writing this code sample, I'm getting a compiler error "A throw statement with no arguments is not allowed outside of a catch clause" so that kinda destroys my idea anyway.

public class ErrorManager {

    public void OnException(Exception ex) {
        LogException(ex);
        if (IsInsideCatchBlockAlready()) {
            // don't destroy the stack trace, 
            // but do make sure the error gets bubbled up
            // through the hierarchy of components
            throw; 
        } else {
            // throw the error to make it bubble up 
            // through the hierarchy of components
            throw ex; 
        }
    }

    void LogException(Exception ex) {
        // Log the exception
    }

    bool IsInsideCatchBlockAlready() {
        // How do I implement this?
    }
}

Answer 1

You don't. There is no way to know if, should you throw an exception, it would be caught or crash the program. You could potentially make a guess at compile time with a code analysis tool, but that wouldn't be an option while the code is running.