如何修复c#代码“indexoutofrangeexception”;未处理的

本文关键字：未处理 indexoutofrangeexception 何修复 代码 | 更新日期: 2023-09-27 18:10:18

嗨，我正在写一个代码，随机化12个月内的每一天，看看它是否下雨和下雨多少。然而，当我想把它存储在一个二维数组它恰好有一个错误，我是如此坚持，我怎么能解决它?我在程序的开头声明了这些

static int[] daysInMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
    const int MONTHS_IN_YEAR = 12;

这是有问题的方法

 static void MakeItRain(int[][] rainfall)
    {
        Random Rainfall = new Random(10);
        Random RainOrNot = new Random(10);

        for (int j = 0; j < MONTHS_IN_YEAR; j++)
        {
            for (int i = 0; i < (daysInMonth[j]); i++)
            {
                if (RainOrNot.Next(1, 5) == 1)
                {
                    rainfall[i][j] = Rainfall.Next(1, 28);
                }
            }
        }
    }

如何修复c#代码“indexoutofrangeexception”;未处理的

当你首先通过MONTHS_IN_YEAR初始化这个锯齿数组时，你必须用正确的索引填充它

 int[][] rainfall = new int[MONTHS_IN_YEAR][];

你注意到了吗?第二个数组没有初始化。这意味着你不能做foreexample 

rainfall[0][0] = something;

你必须先初始化第二个数组

rainfall[0] = new int[6];
rainfall[0][0] = something;

现在你的代码应该是这样的

 static void MakeItRain(int[][] rainfall)
    {
        Random Rainfall = new Random(10);
        Random RainOrNot = new Random(10);
        for (int j = 0; j < MONTHS_IN_YEAR; j++)
        {
            rainfall[j] = new int[daysInMonth[j]]; // initialize second array
            for (int i = 0; i < (daysInMonth[j]); i++)
            {
                if (RainOrNot.Next(1, 5) == 1)
                {
                    rainfall[j][i] = Rainfall.Next(1, 28);
                }
            }
       }
   }

我能够成功运行您的代码，但是当传递给MakeItRain方法的'降雨量'数组太小，方法内部的迭代无法导航时，得到了IndexOutOfRangeException。

This runs successfully:

public class Program
{
    static int[] daysInMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
    const int MONTHS_IN_YEAR = 12;
    public void Main(string[] args)
    {
        int[,] rain = new int[31, MONTHS_IN_YEAR];
        MakeItRain(rain);
    }
    static void MakeItRain(int[,] rainfall)
    {
        Random Rainfall = new Random(10);
        Random RainOrNot = new Random(10);
        for (int j = 0; j < MONTHS_IN_YEAR; j++)
        {
            for (int i = 0; i < (daysInMonth[j]); i++)
            {
                if (RainOrNot.Next(1, 5) == 1)
                {
                    rainfall[i,j] = Rainfall.Next(1, 28);
                }
            }
        }
    }
}
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