Most efficient way to parse a flagged enum to a list

Question

I have a flagged enum and need to retrieve the names of all values set on it.

I am currently taking advantage of the enum\'s ToString() method which returns the eleme

Answer 1

List GetRoleNames(Roles roles) =>
    Enum.GetValues(typeof(Roles))
        .Cast()
        .Where(role => roles.HasFlag(role))
        .Select(role => role.ToString())
        .ToList();

void TestRoleSelection()
{
    var selectedRoles = (Roles)6;
    var roleNames = GetRoleNames(selectedRoles);
    Console.WriteLine(string.Join(",", roleNames));
    // Output: Admin,User
}

[Flags]
enum Roles
{
    SuperAdmin = 1,
    Admin = 2,
    User = 4,
    Anonymous = 8
}