将字典从<父级，子级反转为<子级，IEnumerable<Parent>>

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

public class Parent
{
    public string Name { get; set; }
}

public class Program
{
    public static void Main(string[] args)
    {
        Dictionary<string, string> originalDictionary = new Dictionary<string, string>
        {
            { "Parent1", "Child1" },
            { "Parent2", "Child2" },
            { "Parent3", "Child1" },
            { "Parent4", "Child3" },
            { "Parent5", "Child2" }
        };

        Dictionary<string, List<Parent>> reversedDictionary = new Dictionary<string, List<Parent>>();

        foreach (var kvp in originalDictionary)
        {
            string child = kvp.Value;
            string parent = kvp.Key;

            if (reversedDictionary.ContainsKey(child))
            {
                reversedDictionary[child].Add(new Parent { Name = parent });
            }
            else
            {
                reversedDictionary[child] = new List<Parent> { new Parent { Name = parent } };
            }
        }

        IEnumerable<Parent> result = reversedDictionary.SelectMany(kvp => kvp.Value);

        foreach (var parent in result)
        {
            Console.WriteLine(parent.Name);
        }
    }
}