C# 将哨兵值排除在我的数组之外

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Console;
namespace IntegerStatistics
{
class Program
{
    static void Main(string[] args)
    {
        int[] numbers = new int[10];
        int arrayCount, high, low, sum;
        double avg;
        arrayCount = FillArray(numbers);

        Statistics(numbers, arrayCount, out high, out low, out sum, out avg);
        for (int x = 0; x < numbers.Length; ++x)
            Write("{0, 4}", numbers[x]);
        WriteLine();
        WriteLine("The array has {0} values", arrayCount);
        WriteLine("The highest value is {0}", high);
        WriteLine("The lowest value is {0}", low);
        WriteLine("The sum of the array is {0}", sum);
        WriteLine("The average is {0}", avg);
    }
    private static int FillArray(int[] numbers)
    {
         const int QUIT = 999;
        string enterNum;
        int stop;
        int count = 0;
        int addNum = 0;
        stop = numbers.Length - 1;
        while((addNum != QUIT) && (count <= stop))
        {
            Write("Enter a number or 999 to exit: ");
            enterNum = ReadLine();
            while (!int.TryParse(enterNum, out numbers[count]))
                {
                WriteLine("Error");
                Write("Enter a number or 999 to exit: ");
                enterNum = ReadLine();
            }

            numbers[count] = Convert.ToInt32(enterNum);
            addNum = numbers[count];
            ++count;

        }
        return count;

    }
    private static int Statistics(int[] numbers, int arrayCount, out int high, out int low, out int sum, out double avg)
    {
        high = numbers.Max();
        low = numbers.Min();
        sum = numbers.Sum();
        avg = numbers.Average();

        return arrayCount;
    }


}

首先，让我们修复您的代码，因为它非常简单：与其在Main中使用numbers.Length，不如使用 arrayCount 。这是您已经拥有的东西，它将阻止Main在最后显示零。

我想[...]来操纵我的数组长度

尽管 .NET 提供了一种调整数组大小的方法，但这不是您通常应该执行的操作，因为您的代码很快就会变得难以阅读。

解决此问题的更好方法是从 FillArray 返回大小合适的数组。但是，最好的解决方案是切换到使用 List<T> ，允许根据需要增长和收缩。

我已经修改了您的原始程序以使用List<int>（良好做法）而不是动态调整大小的整数数组（一般来说，没有那么好的做法）。

class Program
{
    static void Main(string[] args)
    {
        // Use a collection instead of an array, as length is as of yet unknown:
        List<int> numbers;
        int high, low, sum;
        double avg;
        numbers = FillArray();
        Statistics(numbers, out high, out low, out sum, out avg);
        foreach (var number in numbers)
        {
            Console.Write("{0, 4}", number);
        }
        Console.WriteLine();
        Console.WriteLine("The array has {0} values", numbers.Count);
        Console.WriteLine("The highest value is {0}", high);
        Console.WriteLine("The lowest value is {0}", low);
        Console.WriteLine("The sum of the array is {0}", sum);
        Console.WriteLine("The average is {0}", avg);
        Console.ReadKey();
    }
    private static List<int> FillArray(int maximum = 10)
    {
        const int QUIT = 999;
        int count = 0;
        int addNum = 0;
        var list = new List<int>();
        while (count <= maximum)
        {
            Console.Write("Enter a number or 999 to exit: ");
            if (!int.TryParse(Console.ReadLine(), out addNum))
            {
                Console.WriteLine("Error");
                continue;
            }
            if (addNum == QUIT)
            {
                break;
            }
            list.Add(addNum);
            count++;
        }
        return list;
    }
    private static void Statistics(List<int> numbers, out int high, out int low, out int sum, out double avg)
    {
        high = numbers.Max();
        low = numbers.Min();
        sum = numbers.Sum();
        avg = numbers.Average();
    }
}

我还注意到您在收集numbers时包括了999的"转义"值。 我更正了这一点，以便999不包括在计算的平均值中（我猜这是您的意图）。

类似于@Dave。允许值为 999。没有异常处理，...

class Program
    {
        private static string _STOP = "STOP";
        private static int _MAX_SIZE = 10;
        static void Main(string[] args)
        {
            List<int>numbers = FillList();
            foreach(int number in numbers)
                Console.Write("{0, 4}", number);
            Console.WriteLine();
            Console.WriteLine("The list has {0} values", numbers.Count);
            Console.WriteLine("The highest value is {0}", numbers.Max());
            Console.WriteLine("The lowest value is {0}", numbers.Min());
            Console.WriteLine("The sum of the array is {0}", numbers.Sum());
            Console.WriteLine("The average is {0}", numbers.Average());
            Console.ReadKey();
        }
        private static List<int> FillList()
        {
            List<int> numbers = new List<int>();
            int value;
            int count = 0;
            do
            {
                Console.Write("Enter a number or {0} to exit: ", _STOP);
                string line = Console.ReadLine();
                if (line == _STOP)
                    break;
                if (int.TryParse(line, out value))
                {
                    numbers.Add(value);
                    count++;
                }
                else
                {
                    Console.WriteLine("Error reading number.");
                }
            } while (count < _MAX_SIZE);
            return numbers;
        }
    }