隱式枚舉轉換允許把十進制整數0 轉換成任何枚舉類型，對應其它的整數則不存在這種隱式轉換，下面用一個例子來具體說明本問題：

using System;
        enum Weekday{
                Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
       };

class Test
       {
               public static void Main() {
                       Weekday day;
                        day = 0;
                       Console.WriteLine(day);
               }
       }

程序的輸出是

0

注意：把 day = 0 改寫為 day = 1 編譯器就會給出下面的錯誤：

Can not implictly convert type 'int' to type 'enum'