如何在Dict<int、List<Tuple<string、string>>>中查找键，使列表包含具有给定Item1和Items的元素

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

public class Program
{
    public static int FindKeyWithItem(string item1, string item2, Dictionary<int, List<Tuple<string, string>>> dict)
    {
        foreach (var kvp in dict)
        {
            var list = kvp.Value;
            var match = list.FirstOrDefault(t => t.Item1 == item1 && t.Item2 == item2);
            if (match != null)
            {
                return kvp.Key;
            }
        }
        
        return -1; // 返回一个特定的值表示未找到
    }
    
    public static void Main()
    {
        // 示例字典
        var dict = new Dictionary<int, List<Tuple<string, string>>>
        {
            { 1, new List<Tuple<string, string>> { Tuple.Create("A", "B"), Tuple.Create("C", "D") } },
            { 2, new List<Tuple<string, string>> { Tuple.Create("E", "F"), Tuple.Create("G", "H") } },
            { 3, new List<Tuple<string, string>> { Tuple.Create("I", "J"), Tuple.Create("K", "L") } }
        };
        
        // 查找键，使列表包含具有给定Item1和Item2的元素
        int key = FindKeyWithItem("E", "F", dict);
        if (key != -1)
        {
            Console.WriteLine("找到匹配的键：" + key);
        }
        else
        {
            Console.WriteLine("未找到匹配的键");
        }
    }
}