Symfony 1.1 Custom 500 Exception Access

In .NET 4.5 there is now the ExceptionDispatchInfo class.

This lets you capture an exception and re-throw it without changing the stack-trace:

using ExceptionDispatchInfo = 
    System.Runtime.ExceptionServices.ExceptionDispatchInfo;

try
{
    task.Wait();
}
catch(AggregateException ex)
{
    ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
}

This works on any exception, not just AggregateException.

It was introduced due to the await C# language feature, which unwraps the inner exceptions from AggregateException instances in order to make the asynchronous language features more like the synchronous language features.

Use TestCase.assertRaises (or TestCase.failUnlessRaises) from the unittest module, for example:

import mymod

class MyTestCase(unittest.TestCase):
    def test1(self):
        self.assertRaises(SomeCoolException, mymod.myfunc)