/// <summary>
/// Determines whether the identity is a member of the accounts collection,
/// either directly, or indirectly through a group or a role membership
/// </summary>
/// <param name="accounts">The accounts.</param>
/// <param name="identity">The identity.</param>
/// <returns>
/// <c>true</c> if the identity is a member of the collection ; otherwise, <c>false</c>.
/// </returns>
public static bool ContainsOrMemberOf(this ICollection<IIdentity> accounts,IIdentity identity)
{
if (accounts.Count(a => a.GetMappedId() == identity.GetMappedId()) > 0)
return true;
IEnumerable<IIdentity> groups =identity.MemberOf();
IEnumerable<IIdentity> roles = identity.InRoles();
return
groups.Select(a=>a.GetMappedId()).Any(accounts.Select(a=>a.GetMappedId()).Contains) ||
roles.Select(a => a.GetMappedId()).Any(accounts.Select(a => a.GetMappedId()).Contains);
}
