c# - 并非所有代码路径都返回值C#错误

Question

在我的C#编程类中，我们正在练习创建方法的蛋白质，在我的方法中，我不断在第26行收到“并非所有代码路径都返回值”错误。
我们对此的指示是:

Create a console-based application that computes the price of a desk and whose Main() method calls four other methods: • A method to accept the number of drawers in the desk as input from the keyboard. This method returns the number of drawers to the Main() method. • A method to accept as input and return the type of wood—‘m’ for mahogany, ‘o’ for oak, or ‘p’ for pine. • A method that accepts the number of drawers and wood type, and calculates the cost of the desk based on the following: • Pine desks are $100. • Oak desks are $140. • All other woods are $180. • A $30 surcharge is added for each drawer. •This method returns the cost to the Main() method. • A method to display all the details and the final price. Save the file as Desks.cs

现在，我知道它没有像需求中所述的4种不同的方法，但是我认为我可以缩短它。

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

namespace Desks.cs
{
    class Program
    {
        static void Main(string[] args)
        {
            int price = numDrawers() + woodType();
            Console.WriteLine("The total price is " + price);
            Console.ReadLine();
        }
        public static int numDrawers()
        {

            Console.Write("Enter the number of drawers you want with your desk: ");
            int drawers = Convert.ToInt32(Console.ReadLine());
            int drawerprice = 30 * drawers;
            Console.WriteLine("The number of drawers you want is " + drawerprice);
            return drawerprice;
        }
        public static int woodType()
        {
            char deskWood = 'a';
            while(deskWood != 'o' || deskWood != 'p' || deskWood != 'm')
            {
                Console.Write("Enter the type of wood you would like your desk to be made of \n Oak(o), Pine(p), or Mahogany(m): ");
                deskWood = Convert.ToChar(Console.ReadLine());
                int woodprice = 0;
                if (deskWood == 'o')
                {
                    woodprice += 140;
                    return woodprice;
                }
                else if (deskWood == 'p')
                {
                    woodprice += 100;
                    return woodprice;
                }
                else if (deskWood == 'm')
                {
                    woodprice += 180;
                    return woodprice;
                }
                else
                {
                    Console.WriteLine("There is no wood that corrisponds to that letter.");
                }
                Console.WriteLine("The type of wood you want the desk to be made of is " + deskWood);
            }
        }
    }

Answer 1

该错误与您的woodType()方法未在所有代码路径上返回整数这一事实相对应。您的程序如下所示:

using System;

public class Program
{
    public static void Main()
    {
        int getWoodTypePrice=woodType();
        if(getWoodTypePrice == 0)
        {
            Console.WriteLine("There is no wood that corrisponds to that letter.");
        }
        int price = numDrawers() + woodType();
        Console.WriteLine("The total price is " + price);
        Console.ReadLine();
    }

    public static int numDrawers()
    {

        Console.Write("Enter the number of drawers you want with your desk: ");
        int drawers = Convert.ToInt32(Console.ReadLine());
        int drawerprice = 30 * drawers;
        Console.WriteLine("The number of drawers you want is " + drawerprice);
        return drawerprice;
    }

    public static int woodType()
    {
        char deskWood = 'a';
        int woodprice = 0;
        while(deskWood != 'o' || deskWood != 'p' || deskWood != 'm')
        {
            Console.Write("Enter the type of wood you would like your desk to be made of \n Oak(o), Pine(p), or Mahogany(m): ");
            deskWood = Convert.ToChar(Console.ReadLine());

            if (deskWood == 'o')
            {
                woodprice += 140;
            }
            else if (deskWood == 'p')
            {
                woodprice += 100;
            }
            else if (deskWood == 'm')
            {
                woodprice += 180;                   
            }
            else
            {
                //Console.WriteLine("There is no wood that corrisponds to that letter.");
                return woodprice;
            }
            //Console.WriteLine("The type of wood you want the desk to be made of is " + deskWood);
        }
        return woodprice;
    }
}