public IEnumerable <string> ListFunctionsForRoles(IEnumerable <string> roles, IUnitOfWork unitOfWork = null)
{
// Get local copy of reference to roles dictionary
Dictionary <string, Role> rolesByName = _rolesByName;
// If reference does not exist, create the dictionary
if (rolesByName == null)
{
IEnumerable <Role> rolesObjects = _authorizationRepository.ListRoles(unitOfWork);
rolesByName = rolesObjects.GroupBy(r => r.Name).ToDictionary(g => g.Key, g => g.First());
_rolesByName = rolesByName;
}
// Get long list of all functions in roles
List <string> functions = new List <string>();
foreach (string role in roles)
{
Role roleObject = rolesByName[role];
functions.AddRange(roleObject.Functions.Select(f => f.Name));
}
// Return list of functions with no duplicates
return(functions.Distinct());
}