如何将函数OR字符串存储为字典中的值(C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // 创建一个Dictionary
        Dictionary<string, object> dictionary = new Dictionary<string, object>();

        // 存储函数作为值
        dictionary["function"] = new Action(() => Console.WriteLine("Hello, World!"));

        // 存储字符串作为值
        dictionary["string"] = "This is a string.";

        // 从字典中获取并执行函数
        if (dictionary["function"] is Action action)
        {
            action.Invoke();
        }

        // 从字典中获取并打印字符串
        if (dictionary["string"] is string str)
        {
            Console.WriteLine(str);
        }
    }
}