Why is this an issue?
enums are usually used to identify distinct elements in a set of values. However enums can be treated as bit fields and
bitwise operations can be used on them to combine the values. This is a good way of specifying multiple elements of set with a single value. When
enums are used this way, it is a best practice to mark the enum with the FlagsAttribute.
Noncompliant code example
enum Permissions
{
None = 0,
Read = 1,
Write = 2,
Execute = 4
}
// ...
var x = Permissions.Read | Permissions.Write; // Noncompliant; enum is not marked with [Flags]
Compliant solution
[Flags]
enum Permissions
{
None = 0,
Read = 1,
Write = 2,
Execute = 4
}
// ...
var x = Permissions.Read | Permissions.Write;
