How do I determine if an Enum value has one or more of the values it's being compared with?
You can do that by combining values with |
and checking via &
.
To check if the value contains either of the tags:
if ((myValue & (Tag.PrimaryNav | Tag.HomePage)) != 0) { ... }
The |
combines the enums you're testing (bitwise) and the &
tests via bitwise masking -- if the result isn't zero, it has at least one of them set.
If you want to test whether it has both of them set, you can do that as well:
Tag desiredValue = Tag.PrimaryNav | Tag.HomePage;
if ((myValue & desiredValue) == desiredValue) { ... }
Here we're masking off anything we don't care about, and testing that the resulting value equals what we do care about (we can't use != 0
like before because that would match either value and here we're interested in both).
Some links:
- The
&
Operator - The
|
Operator
You can use the HasFlag Method to avoid the need for the boolean logic,
Tag Val = (Tag)9;
if (Val.HasFlag(Tag.PrimaryNav))
{
Console.WriteLine("Primary Nav");
}
if(Val.HasFlag(Tag.HomePage))
{
Console.WriteLine("Home Page");
}
For bitwise (Flags
) enums, an "any of" test is != 0, so:
const Tag flagsToLookFor = Tag.PrimaryNav | Tag.HomePage;
if ((node.Tag & flagsToLookFor) != 0) {
// has some cross-over with PrimaryNav or HomePage (and possibly others too)
}