Total number of items defined in an enum

You can use the static method Enum.GetNames which returns an array representing the names of all the items in the enum. The length property of this array equals the number of items defined in the enum

var myEnumMemberCount = Enum.GetNames(typeof(MyEnum)).Length;

Enum.GetValues(typeof(MyEnum)).Length;

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 |

You can use Enum.GetNames to return an IEnumerable of values in your enum and then. Count the resulting IEnumerable.

GetNames produces much the same result as GetValues but is faster.

From the previous answers just adding code sample.

 class Program
    {
        static void Main(string[] args)
        {
            int enumlen = Enum.GetNames(typeof(myenum)).Length;
            Console.Write(enumlen);
            Console.Read();
        }
        public enum myenum
        {
            value1,
            value2
        }
    }