在C#中寻找一个简单的独立持久字典实现

using System;
using System.IO;
using System.Collections.Generic;
using System.Runtime.Serialization.Formatters.Binary;

public class PersistentDictionary<TKey, TValue> : Dictionary<TKey, TValue>
{
    private string _filePath;

    public PersistentDictionary(string filePath)
    {
        _filePath = filePath;
        if (File.Exists(filePath))
        {
            Load();
        }
    }

    public void Load()
    {
        using (FileStream fs = new FileStream(_filePath, FileMode.Open))
        {
            BinaryFormatter formatter = new BinaryFormatter();
            Dictionary<TKey, TValue> data = (Dictionary<TKey, TValue>)formatter.Deserialize(fs);
            foreach (KeyValuePair<TKey, TValue> kvp in data)
            {
                this[kvp.Key] = kvp.Value;
            }
        }
    }

    public void Save()
    {
        using (FileStream fs = new FileStream(_filePath, FileMode.Create))
        {
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(fs, this);
        }
    }
}

var dict = new PersistentDictionary<string, int>("data.bin");
dict["apple"] = 5;
dict["banana"] = 3;
dict.Save();

var dict = new PersistentDictionary<string, int>("data.bin");
dict.Load();
foreach (var item in dict)
{
    Console.WriteLine($"{item.Key}: {item.Value}");
}