Getting common flags enum value in c#

Question

Say I have the below enum

[Flags]
enum Letters
{
     A = 1,
     B = 2,
     C = 4,
     D = 8,
     E = 16,
     F = 32,
     AB = A | B,
     All = A | B | C,         


        

Answer 1

If that's suitable for you it will return List of individual flags

 static IEnumerable GetFlags(Enum input)
    {
        foreach (Enum value in Enum.GetValues(input.GetType()))
            if (input.HasFlag(value))
                yield return value;
    }

GetFlags(s).Intersect(GetFlags(p))