索引超出數組錯誤的范圍

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告訴我，第56、41和14行可能是問題所在，因此我猜測這與我的隨機數生成器有關。

有人可以幫我嗎？

Answer 1

看起來像entrees和entreeMealCaloricVal包含12個項目。 這意味着它們將從0索引到11。

使用random.Next(0,13)將生成一個從0到12的數字。當您嘗試訪問索引12的那些數組時，將引發異常。