private bool Contains(IAccessRule rule)
{
return(_accessRules.SingleOrDefault(x => x.GetType() == rule.GetType()) != null);
}
public void AppendAccessRule(IAccessRule rule)
{
Guard.AgainstArgumentNull(rule, "rule");
if (!Contains(rule))
{
_accessRules.Add(rule);
}
else
{
throw new ArgumentException(string.Format("Rule '{0}' is already added", rule.GetType()));
}
}