索引超出了数组的范围错误

Question

public class dailyMenu   
{    

    private string day=""; 
    private int date = 0; 
    private static int nextDate=1; 
    private string entree =""; 
    private double price; 
    private double calories; 

    private static string [] daysOfWeek= {"Monday","Tuesday","Wednesday", 
     "Thursday", "Friday", "Saturday", "Sunday"}; 

    private static string[] entrees = {"Beef Tenderloin Fresco", 
     "Madagascar Filet Mignon", "Filet Mignon", " Lobster Ravioli", 
     "Asian Infused Braised Beef", "New Age Chicken Cordon Bleu", 
     "Short Ribs", " Beef Wellington","Fajitas", "Bacon Cheeseburger", 
     "Beef Burgandy", "Spagehetti"}; 

    private static double [] entreePrices= { 5.99,7.99,6.99,4.50,9.99,10.29, 
     5.67,8.99, 3.99,4.78,10,79,6.98}; 

    private static int[] entreeMealCaloricVal= { 999,1288,770,699,450,999,1500,873, 911, 
     1011, 777,500}; 

    public dailyMenu() 
    { 
     assignDate(); 
     GetDay(); 
     RandPopulate(); 
    } 

    void assignDate() 
    { 
     date = nextDate; 
     nextDate++; 

     if (GetDay()== "Friday") 
     { 
      nextDate += 2; 
     } 
    } 

    void RandPopulate() 
    { 
     Random random = new Random(); 
     int randomNumber = random.Next(0,13); 

     entree = entrees [randomNumber]; 
     price = entreePrices [randomNumber]; 
     calories = entreeMealCaloricVal [randomNumber]; 
    } 
} 

IDE告诉我第56,41和14行可能是问题，所以我猜测它与我的随机数生成器有关。

有人能帮我一下吗？

Answer 1

看起来像entrees和entreeMealCaloricVal包含12项。这意味着它们将从0到11索引。

使用random.Next(0,13)将生成一个从0到12的数字。当您尝试访问索引为12的数组时，将抛出异常。