Exception Handling

CSnakes will raise a PythonInvocationException if an error occurs during the execution of the Python code. The PythonInvocationException class contains the error message from the Python interpreter as the InnerException.

If the annotations are incorrect and your Python code returns a different type to what CSnakes was expecting, an InvalidCastException will be thrown with the details of the source and destination types.

Fetching stack traces

You can fetch the Python stack trace as well as the Globals and Locals of the top frame by getting the InnerException attribute of the raised PythonInvocationException:

try
{
  env.MethodToCall();
}
catch (PythonInvocationException ex)
{
  Console.WriteLine(ex.PythonExceptionType); // E.g. ValueError
  Console.WriteLine(ex.InnerException.PythonStackTrace); // IEnumerable<string> with the complete stack trace
  Console.WriteLine(ex.InnerException.Data["locals"]); // Dictionary <string, PyObject>
  Console.WriteLine(ex.InnerException.Data["globals"]); // Dictionary <string, PyObject>
}