Question

在我的转换程序中，我使用字典为从预定义文本文件中读取的特定行指定名称。然后创建一个名为＆＃34; Rows＆＃34;的多维数组。发生错误：

已添加具有相同键的项目。

编写以下代码：

        Dictionary<string, int> rows = new Dictionary<string, int>();

        // The file "read.txt" is being read 
        string[] lines = File.ReadAllLines("read.txt");

        int[] array = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

        // In this section each line is being read and the spacing is removed 

        foreach (string s in lines)
        {
            string[] arr = s.Split(' '); // This line ables the program to differ between variables and numbers. 

            for (int i = 0; i < arr.Length; i++)
            {
                array[i] = Convert.ToInt32(arr[i]); // arr is now converted into a Int.

                rows.Add("array" + i, array[i]);

            }
        }

然后调试错误，然后循环结束。为什么会出现错误以及如何解决？

Answer 1

如果您有多行，则会再次从"array" + i == array0开始。该项已经添加到字典中，因此例外。

你必须记住对行进行编号，所以也许你应该像"array" + "line" + lineNumber + "row" + i那样格式化它。

Answer 2

Dictionary只允许出现一次键，错误意味着你要两次添加相同的键。

你的for循环插入"array" + i作为键。在foreach循环的第二次运行中，i再次为0，因此您实际上插入了"item0"两次，并且正在获得异常。

Answer 3

这是寻求全功能解决方案的用户。通过结合其他答案，我得到了一个功能代码。它返回它想要做的事情。

namespace test_read_txt
{
class Program
{
    static void Main(string[] args)
    {
        // A string is created for the 14 first element 


        Dictionary<string, int[]> rows = new Dictionary<string, int[]>();


        // The file "read.txt" is being read 
        string[] lines = File.ReadAllLines("read.txt");

        // In this section each line is being read and the spaceing is removed 
        int counter = 0;

        foreach (string s in lines)
        {
            //Console.WriteLine(s);
            string[] arr = s.Split(' '); // This line ables the program to differ between variables and numbers. 

            int[] array = new int[arr.Length];

            for (int i = 0; i < arr.Length; i++)
            {
                array[i] = Convert.ToInt32(arr[i]); // arr is now converted into a Int.
            }


            string key = "array_" + counter++;
            rows.Add(key, array);
            //ShowArray(array);

        }

        foreach (string key in rows.Keys)
        {
            Console.WriteLine($"{key}: {String.Join(" ", rows[key])}");
        }


        Console.ReadLine();
    }

    public static void ShowArray(int[] arr) {
        foreach (var item in arr) {
            Console.Write(item + "-");
        }
        Console.WriteLine();
    }
}

}

读取文件是一个看起来像这样的文本文件，它位于bin - ＆gt;调试程序文件夹：

0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0

Output是每一行，作为int []，名称为array_0 ... array12。享受!!

Answer 4

您可能希望将多个 int与词典中的键相关联。字典不会为此做，而是

Dictionary<string, List<int>>  or   Dictionary<string, HashSet<int>>

如果您使用（“array”+ i）作为键，则int会执行此操作。

初始化一个有很多0的数组并不是很好，而是使用new int [n]。

通过这些小改动，这是我的更新版本：

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

namespace StackOverflow
{
  class Program
  {
    static void Main(string[] args)
    {
        Dictionary<string, HashSet<int>> rows = new Dictionary<string, HashSet<int>>();

        // The file "read.txt" is being read 
        string[] lines = new string[] { "1", "2", "1 2"};  //File.ReadAllLines("read.txt");

        // In this section each line is being read and the spacing is removed 
        foreach (string s in lines)
        {
            string[] arr = s.Split(' '); // This line ables the program to differ between variables and numbers. 

            int[] array = new int[arr.Length];
            for (int i = 0; i < arr.Length; i++)
            {
                array[i] = Convert.ToInt32(arr[i]); // arr is now converted into a Int.

                string key = "array" + i;
                if (!rows.ContainsKey(key)) rows.Add(key, new HashSet<int>());
                rows[key].Add(array[i]);
            }
        }

        foreach (string key in rows.Keys)
        {
            Console.WriteLine($"{key}: {String.Join(", ", rows[key])}");
        }
    }
  }
}

可能会有许多进一步的改进。

已添加相同的密钥，然后尝试命名行

4 个答案: