C#如何在将用户输入放入我的数组之前验证用户输入？

Question

我对 C# 非常陌生，我想知道如何在将用户输入放入我的数组之前验证用户输入。我正在尝试创建一个控制台应用程序来创建由星星组成的垂直和水平直方图。所以我要求用户输入 1-10 之间的 8 个数字，并将他们的结果作为直方图打印到屏幕上。 我需要 3 件事的帮助： 1.我怎样才能让他们只能在菜单和数组中输入数字？ 2.我不知道如何垂直显示直方图，我做了水平的，不知道如何使它垂直。 3. 另外，我想在直方图中添加标签。例如

1 **** (Number of stars user selected) 
2 ****** (Number of stars user selected)
3 ***** (Number of stars user selected)
4 * etc.

非常感谢任何帮助！非常感谢你。 :) 这是我到目前为止所得到的：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Exercise_3A
{
    class Program
    {
        static void Main(string[] args)
        {
            clsMainMenu MainMenu = new clsMainMenu();
            ConsoleKeyInfo ConsoleKeyPressed;

            do
            {
                MainMenu.DisplayMenu();
                ConsoleKeyPressed = Console.ReadKey(false);
                Console.WriteLine();
                switch (ConsoleKeyPressed.KeyChar.ToString())
                {
                    case "1":
                        clsHistogram Histogram = new clsHistogram();
                        Histogram.CreateHorizontalHistogram();
                        break;
                    case "2":
                        clsHistogram HistogramV = new clsHistogram();
                        HistogramV.CreateVerticalHistogram();
                        break;
                }
            } while (ConsoleKeyPressed.Key != ConsoleKey.Escape);

        }
    }
}

---

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Exercise_3A
{
    class clsMainMenu
    {
        public void DisplayMenu()
        {
            Console.WriteLine("1. Create a Horizontal Histogram.");
            Console.WriteLine("2. Create a Vertical Histogram.");
            Console.WriteLine("Press Esc to exit the Program.");
            Console.WriteLine("..................................");
        }
    }
}

---

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Exercise_3A
{
    class clsHistogram
    {
        string strNumberChosen = "";

        public void CreateHorizontalHistogram()
        {
            Console.WriteLine("Please enter a number between 1 and 10:");

            int[] intHistogramArray = new int[8];

            for (int intCounter = 0; intCounter < 8; intCounter++)
            {
                Console.WriteLine("Enter number " + (intCounter + 1) + " :");
                strNumberChosen = Console.ReadLine(); // Need Data Validation Here.             
            } // Populating Array.

            Console.WriteLine("Your Histogram looks like this: ");
            for (int intcounter = 0; intcounter < 8; intcounter++)
            {
                int intStarPlot = intHistogramArray[intcounter];
                while (intStarPlot > 0)
                {
                    Console.Write(" *");
                    intStarPlot -= 1;
                }
                Console.WriteLine();
            } // Display a Horizontal Array.
        }


        public void CreateVerticalHistogram()
        {
            Console.WriteLine("Please enter a number between 1 and 10:");

            int[] intHistogramArray = new int[8];

            for (int intCounter = 0; intCounter < 8; intCounter++)
            {
                Console.WriteLine("Enter number " + (intCounter + 1) + " :");
                strNumberChosen = Console.ReadLine(); // Need Data Validation Here.
            } // Populating Array.

            Console.WriteLine("Your Histogram looks like this: ");
            for (int intcounter = 0; intcounter < 8; intcounter++)
            {
                int intStarPlot = intHistogramArray[intcounter];
                while (intStarPlot > 0)
                {
                    Console.Write(" * \n");
                    intStarPlot -= 1;
                }
                Console.WriteLine();
            } // Display a Vertical Array.
        }
    }
}

Answer 1

这是一个使用int.TryParse() 方法评估输入数据的代码示例。

    private static readonly char star = '*';
    private static readonly uint minValue = 1;
    private static readonly int maxValue = 10;

    private static void CreateHorizontalHistogram()
    {
        var limits = "a number between " + minValue + " and " + maxValue + ": ";
        Console.WriteLine("Please enter " + limits);

        var list = new List<int>();

        do
        {
            var message = string.Empty;
            bool isNumber = false;
            bool isRightSize = false;
            int output;

            do
            {
                var input = Console.ReadLine();      
                isNumber = int.TryParse(input, out output);
                if(isNumber)
                {
                    isRightSize = minValue <= output && output <= maxValue;
                    message = isRightSize ? "That will do: " : "Try again - value is not " + limits + output;
                }
                else
                {
                    message = "Try again - " + input + " is not a Number";
                }
                Console.WriteLine(message);
            }while(!isNumber || !isRightSize);

            Console.WriteLine("Entered number at position" + (list.Count + 1) + " : " + output);
            list.Add(output);
        }while(list.Count <= 8);

        Console.WriteLine("Your Histogram looks like this: ");
        foreach(var value in list)
        {
            Console.WriteLine(string.Empty.PadRight(value, star));
        }

        Console.WriteLine("Or like this with LINQ");
        list.ForEach(n => Console.WriteLine(string.Empty.PadRight(n, star)));
    }

---

注意：
我使用了List<int> 整数而不是数组int[]...我个人的喜好。 我改变了图表的创建方式。我的版本不那么冗长。 我还添加了一个额外的示例，说明如何使用 LINQ 创建图表——总是看起来不错。

如果您有任何问题，请告诉我。