Total number of items defined in an enum

Question

How can I get the number of items defined in an enum?

Answer 1

I've run a benchmark today and came up with interesting result. Among these three:

var count1 = typeof(TestEnum).GetFields().Length;
var count2 = Enum.GetNames(typeof(TestEnum)).Length;
var count3 = Enum.GetValues(typeof(TestEnum)).Length;

GetNames(enum) is by far the fastest!

|         Method |      Mean |    Error |   StdDev |
|--------------- |---------- |--------- |--------- |
| DeclaredFields |  94.12 ns | 0.878 ns | 0.778 ns |
|       GetNames |  47.15 ns | 0.554 ns | 0.491 ns |
|      GetValues | 671.30 ns | 5.667 ns | 4.732 ns |