public static bool HasValidRoles(this ITextViewRoleSet roles)
{
return(roles.ContainsAll(TextViewRoles.DefaultRoles) &&
roles.Intersect(TextViewRoles.InvalidRoles).Any() == false);
}
private static bool RolesMatch(
IEnumerable <string> roles,
ITextViewRoleSet roleSet)
{
return((roles == null) || (roleSet == null) || roleSet.ContainsAll(roles));
}