using System;  
using System.Collections.Generic;  
using System.IO;  
using System.Linq;  
using System.Threading.Tasks;  
// 假設(shè)使用了一個(gè)簡化的“索引”類來模擬索引構(gòu)建過程  
public class SimpleIndex  
{  
    private Dictionary<string, List<string>> index = new Dictionary<string, List<string>>();  
    public void AddFile(string filePath, string content)  
    {  
        // 假設(shè)對(duì)文本進(jìn)行了簡單的分詞處理（實(shí)際中可能需要更復(fù)雜的分詞算法）  
        string[] words = content.Split(new[] { ' ', ',', '.', '!', '?' }, StringSplitOptions.RemoveEmptyEntries);  
        foreach (var word in words)  
        {  
            if (!index.ContainsKey(word))  
            {  
                index[word] = new List<string>();  
            }  
            index[word].Add(filePath);  
        }  
    }  
    public List<string> Search(string searchTerm)  
    {  
        if (index.ContainsKey(searchTerm))  
        {  
            return index[searchTerm];  
        }  
        return new List<string>();  
    }  
}  
public class FileContentSearch  
{  
    private SimpleIndex index = new SimpleIndex();  
    public async Task BuildIndexAsync(string directoryPath)  
    {  
        var tasks = new List<Task>();  
        foreach (var filePath in Directory.GetFiles(directoryPath, "*.*", SearchOption.AllDirectories))  
        {  
            tasks.Add(Task.Run(() =>  
            {  
                try  
                {  
                    string fileContent = File.ReadAllText(filePath);  
                    index.AddFile(filePath, fileContent);  
                }  
                catch (Exception ex)  
                {  
                    Console.WriteLine($"Error reading file {filePath}: {ex.Message}");  
                }  
            }));  
        }  
        await Task.WhenAll(tasks);  
    }  
    public List<string> Search(string searchTerm)  
    {  
        return index.Search(searchTerm);  
    }  
}  
public class Program  
{  
    public static async Task Main(string[] args)  
    {  
        string directoryPath = @"C:\Your\Directory\Path";  
        FileContentSearch search = new FileContentSearch();  
        // 構(gòu)建索引  
        await search.BuildIndexAsync(directoryPath);  
        // 搜索關(guān)鍵詞  
        string searchTerm = "your_search_term";  
        List<string> results = search.Search(searchTerm);  
        Console.WriteLine("Found in files:");  
        foreach (var result in results)  
        {  
            Console.WriteLine(result);  
        }  
    }  
}