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

You can get that using the binary & (and) operator:

var s = Letters.A | Letters.B | Letters.D;
var p = Letters.A | Letters.C | Letters.D | Letters.E;
var sAndp = s & p; // This will give you only the common values ( A & D)