在泛型集合上实现键值对映射的find函数

using System;
using System.Collections.Generic;

public class KeyValuePair<K, V>
{
    public K Key { get; set; }
    public V Value { get; set; }

    public KeyValuePair(K key, V value)
    {
        Key = key;
        Value = value;
    }
}

public class KeyValueMap<K, V>
{
    private List<KeyValuePair<K, V>> _map = new List<KeyValuePair<K, V>>();

    public void Add(K key, V value)
    {
        _map.Add(new KeyValuePair<K, V>(key, value));
    }

    public V Find(K key)
    {
        foreach (var pair in _map)
        {
            if (pair.Key.Equals(key))
            {
                return pair.Value;
            }
        }
        throw new KeyNotFoundException($"Key '{key}' not found.");
    }
}

class Program
{
    static void Main()
    {
        var map = new KeyValueMap<string, int>();
        map.Add("one", 1);
        map.Add("two", 2);

        try
        {
            int value = map.Find("one");
            Console.WriteLine($"Value for key 'one': {value}");
        }
        catch (KeyNotFoundException ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

public class KeyNotFoundException : Exception
{
    public KeyNotFoundException(string message) : base(message)
    {
    }
}