c# 字节与运算符

Question

how can I use & operator betwen BYTE and INT?

it is said here:

http://int64.org/docs/gamestat-protocols/ase.html

however in php its working but in c# not...

PHP:

if ($flag & 1)
    ...
}

c#

if (flag & 1)
{
  ...
}

Answer 1

The flag & 1 part is working - but if requires a Boolean expression. So you can do:

if ((flag & 1) != 0)

Note that you have to put parentheses round the & expression as != has higher precedence (binds tighter) than & .

If you're working with a set of flags though, it's usually a better idea to use an enum. For example, look at BindingFlags - you might use:

if ((flags & BindingFlags.Instance) != 0)

That increases type safety (so you know you're trying to compare it with the right kind of flag) and reduces the use of magic numbers.

Answer 2

Try like this:

if ((flag & 1) == 1)
{
    ...
}

The & operator returns an integer in C# whereas if expects a boolean expression.