HasFlag always returns True

Question

There is a way to check if I got a flag in a series of flag?

Example:

[Flags]
Enum TestEnum
{
  ALIVE, DEAD, ALMOSTDEAD, HURT, OTHERS

}
// check if          


        

Answer 1

You can certainly use Enum.HasFlag like everyone has suggested. However, its important to make sure that your enumeration falls in powers of two. Powers of two have a single bit set, so your enumeration should look like this:

Enum TestEnum
{
    ALIVE = 1, DEAD = 2, ALMOSTDEAD = 4, HURT = 8, OTHERS = 16
}

The reason this is important is because you are comparing the bit flags. In memory, your enum flags will look like this:

ALIVE      = 00001
DEAD       = 00010
ALMOSTDEAD = 00100
HURT       = 01000
OTHERS     = 10000

When you do a bitwise compare, like DEAD | ALMOSTDEAD, you are doing this:

DEAD       = 00010
           OR
ALMOSTDEAD = 00100
------------------
RESULT     = 00110

Since the Result is > then 0, its true.