How to check if any flags of a flag combination are set?

Question

Let\'s say I have this enum:

[Flags]
enum Letters
{
     A = 1,
     B = 2,
     C = 4,
     AB = A | B,
     All = A | B | C,
}

To check i

Answer 1

If it really annoys you, you can write a function like that:

public bool IsSet(Letters value, Letters flag)
{
    return (value & flag) == flag;
}

if (IsSet(letter, Letters.A))
{
   // ...
}

// If you want to check if BOTH Letters.A and Letters.B are set:
if (IsSet(letter, Letters.A & Letters.B))
{
   // ...
}

// If you want an OR, I'm afraid you will have to be more verbose:
if (IsSet(letter, Letters.A) || IsSet(letter, Letters.B))
{
   // ...
}