c# - 将多个用户输入添加到列表 c#

Question

我正在尝试从用户那里获取用户输入，直到用户未输入任何内容(因此按下回车键)，但它似乎无法正常工作。用户应该能够添加任意数量的数字，并且一旦他们在没有输入数字的情况下按下回车键就应该显示它们。

代码:

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

namespace Lab2
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> numbersInput = new List<string>();

            Console.WriteLine("Please enter an integer");
            string input = Console.ReadLine();
            numbersInput.Add(input);


            while (input != "")
            {
                Console.WriteLine("Please enter another integer: ");
               input = Console.ReadLine();
            }

            if (input == "")
            {
                Console.WriteLine("The number you have entered is: " + " " + input);
                numbersInput.Add(input);
                foreach (string value in numbersInput)
                {
                    Console.WriteLine("The number that was added to the list is : " + " " + value);
                }
                Console.ReadLine();
            }
        }
    }
}

Answer 1

除了空字符串，您没有向 numbersInput 列表添加任何内容。

 if (input == "") // Why do anything with input if you enter this block?
 {
     Console.WriteLine("The number you have entered is: " + " " + input);
     numbersInput.Add(input);
     foreach (string value in numbersInput)

numbersInput.Add(input) 需要放在 while block 中。

试试这个

while (input != "")
{
    Console.WriteLine("Please enter another integer: ");
    input = Console.ReadLine();
    numbersInput.Add(input);
}

if (input == "")
{
    foreach (string value in numbersInput)
    {
        Console.WriteLine("The number that was added to the list is : " + " " + value);
    }
    Console.ReadLine();
}

编辑:求和

更改您的列表声明。

List<int> numbersInput = new List<int>();

然后解析出数字并将它们添加到列表中。如果解析失败，则需要处理错误。

while (input != "")
{
    Console.WriteLine("Please enter another integer: ");
    input = Console.ReadLine();
    int value;
    if(!int.TryParse(input, out value))
    {
       // Error
    }
    else
    {
       numbersInput.Add(value);
    }
}

然后你的列表不再是一个字符串，所以改变foreach

int sum = 0;
foreach (int value in numbersInput)
{
    sum += value;
    Console.WriteLine("The number that was added to the list is : " + " " + value.ToString());
}