根据每行的首字母拆分c#中的.txt文件

using System;
using System.Collections.Generic;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "path/to/your/file.txt";
        Dictionary<char, List<string>> linesByFirstLetter = new Dictionary<char, List<string>>();

        // 打开.txt文件并读取内容
        string[] lines = File.ReadAllLines(filePath);

        // 拆分每行并分类首字母
        foreach (string line in lines)
        {
            if (!string.IsNullOrWhiteSpace(line))
            {
                char firstLetter = line[0];

                if (!linesByFirstLetter.ContainsKey(firstLetter))
                {
                    linesByFirstLetter[firstLetter] = new List<string>();
                }

                linesByFirstLetter[firstLetter].Add(line);
            }
        }

        // 输出分类结果
        foreach (var kvp in linesByFirstLetter)
        {
            Console.WriteLine($"首字母 '{kvp.Key}':");

            foreach (string line in kvp.Value)
            {
                Console.WriteLine(line);
            }

            Console.WriteLine();
        }
    }
}