如何在c#中使用字典比较两个列表

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3, 4, 5 };
        List<int> list2 = new List<int> { 1, 2, 3, 6, 7 };

        Dictionary<int, int> dict1 = new Dictionary<int, int>();
        Dictionary<int, int> dict2 = new Dictionary<int, int>();

        foreach (int num in list1)
        {
            if (dict1.ContainsKey(num))
                dict1[num]++;
            else
                dict1[num] = 1;
        }

        foreach (int num in list2)
        {
            if (dict2.ContainsKey(num))
                dict2[num]++;
            else
                dict2[num] = 1;
        }

        foreach (KeyValuePair<int, int> kvp in dict1)
        {
            int key = kvp.Key;
            int value1 = kvp.Value;
            int value2;

            if (dict2.TryGetValue(key, out value2))
            {
                if (value1 == value2)
                    Console.WriteLine($"{key} appears the same number of times in both lists.");
                else
                    Console.WriteLine($"{key} appears different number of times in the two lists.");
            }
            else
            {
                Console.WriteLine($"{key} is present in the first list but not in the second list.");
            }
        }

        foreach (KeyValuePair<int, int> kvp in dict2)
        {
            int key = kvp.Key;

            if (!dict1.ContainsKey(key))
            {
                Console.WriteLine($"{key} is present in the second list but not in the first list.");
            }
        }
    }
}