/// <summary>
/// Perform an action if we have a particular custom context
/// </summary>
/// <typeparam name="TContext"></typeparam>
/// <param name="action"></param>
public void With <TContext>(Action <TContext> action)
{
if (CustomContext.ContainsKey(typeof(TContext)))
{
action((TContext)CustomContext[typeof(TContext)]);
}
// if (Stuff.HasThing(typeof(TContext))) {
// action(Stuff.GetThing(typeof(TContext)));
// }
}