// Registers a |handler| for the event with |eventName|. Supported event names: error, result. See corresponding
// handler types above.
public FunctionCall On(string eventName, Delegate handler)
{
ValidateHandler(eventName, handler);
if (eventName == "result")
{
OnResult.Add(handler);
}
else if (eventName == "exception")
{
OnException.Add(handler);
}
else if (eventName == "error")
{
OnError += (CallErrorCallback)handler;
}
return(this);
}