如何在 C# 中将字符串转换为整数数组

Question

我是 C# 新手。我正在尝试解决一个我必须找到非耦合整数的问题。我正在使用在线编译器。

给定输入

1, 2, 3, 1, 2

程序应该输出：

3

我创建了以下程序 -

using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int[] num;
        int accum=0;
        int j=0;
        string input = Console.ReadLine();
        input = input.Replace(",","");
        
            
        num = input.Select(int.Parse).ToArray(); 
             

        for (int i = 0; i < num.length; i++)
           accum ^= num[i];
           Console.WriteLine(accum);

    
    }
}

我在将字符串 1, 2, 3, 1, 2 转换为整数数组时遇到问题。

我有以下错误

 error CS1061: Type `string' does not contain a definition for `Select' and no extension method `Select' of type `string' could be found. Are you missing `System.Reactive.Linq' or `System.Linq' using directive?
/usr/lib/mono/4.7.2-api/mscorlib.dll (Location of the symbol related to previous error)
Solution.cs(18,29): error CS1061: Type `int[]' does not contain a definition for `length' and no extension method `length' of type `int[]' could be found. Are you missing an assembly reference?
/usr/lib/mono/4.7.2-api/mscorlib.dll (Location of the symbol related to previous error)

当我添加System.linq时，它给了我

error CS0234: The type or namespace name `linq' does not exist in the namespace `System'. Are you missing an assembly reference?

Answer 1

Select method 适用于可枚举类型，不适用于 string 类型。在尝试将每个元素转换为 int.

之前，您需要将字符串输入转换为字符串数组

string input = Console.ReadLine();
string[] inputs = input.Split(',')
int[] num = inputs.Select(x => int.Parse(x.Trim())).ToArray();

Answer 2

试试这个，

static void Main(string[] args)
{
    int[] num;
    int accum = 0;
    string input = Console.ReadLine();

    num = Array.ConvertAll(input.Split(','), int.Parse);

    for (int i = 0; i < num.Length; i++)
        accum ^= num[i];
    Console.WriteLine(accum);

}

或者使用Linq，如下替换即可，需要使用System.Linq命名空间。

num = input.Split(',').Select(int.Parse).ToArray();

.NetFiddle : https://dotnetfiddle.net/bahpg9

Answer 3

下面提供了一个扩展方法来检查是否所有输入的值都可以是 int，如果可以，则创建一个 int 数组。

Working example and class project double、floats 等类似代码

代码比之前的回复多很多，但这里提供的代码不只是一个操作，放在一个class项目中，然后可以被其他项目使用。

public static class NumericArray
{
    /// <summary>
    /// Determine if each element in the string array can represent an int
    /// </summary>
    /// <param name="sender"></param>
    /// <returns></returns>
    public static bool AllInt(this string[] sender) =>
        sender.SelectMany(item => item.ToCharArray()).All(char.IsNumber);

    /// <summary>
    /// Convert a string array to an int array
    /// </summary>
    /// <param name="sender">string array which can represent integers</param>
    /// <returns>int array</returns>
    public static int[] ToIntegerArray(this string[] sender)
    {

        var intArray = Array
            .ConvertAll(sender,
                (input) => new
                {
                    IsInteger = int.TryParse(input, out var integerValue),
                    Value = integerValue
                })
            .Where(result => result.IsInteger)
            .Select(result => result.Value)
            .ToArray();

        return intArray;

    }

    /// <summary>
    /// Return a string array without spaces in elements
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="separator">deliminator</param>
    /// <returns></returns>
    public static string[] Strings(this string sender, char separator = ',') 
        => sender.RemoveAllWhiteSpace().Split(separator);

    /// <summary>
    /// Remove all whitespace from a string
    /// </summary>
    /// <param name="sender"></param>
    /// <returns></returns>
    public static string RemoveAllWhiteSpace(this string sender)
        => sender
            .ToCharArray().Where(character => !char.IsWhiteSpace(character))
            .Select(c => c.ToString()).Aggregate((value1, value2) => value1 + value2);
}

在这种情况下模拟输入的示例使用。

namespace ConsoleNetCoreApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            /*
             * This would be string userInput = Console.ReadLine();
             */
            string userInput = "1, 2, 3, 1, 2";
            var result = userInput.Strings();
            if (result.AllInt())
            {
                var intArray = result.ToIntegerArray();
                foreach (var intItem in intArray)
                {
                    Console.WriteLine($"{intItem}");
                }
            }
            else
            {
                Console.WriteLine("One or more values can not represent an int");
            }
        }
    }
}

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