如何在c#中动态更改字典中的键？

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        Dictionary<string, string> dict = new Dictionary<string, string>();
        dict.Add("key1", "value1");
        dict.Add("key2", "value2");

        Console.WriteLine("Original dictionary:");
        foreach (KeyValuePair<string, string> pair in dict)
        {
            Console.WriteLine("{0}: {1}", pair.Key, pair.Value);
        }

        string oldKey = "key1";
        string newKey = "newKey1";

        // Check if the old key exists in the dictionary
        if (dict.ContainsKey(oldKey))
        {
            // Get the value associated with the old key
            string value = dict[oldKey];

            // Remove the old key from the dictionary
            dict.Remove(oldKey);

            // Add the new key with the same value
            dict.Add(newKey, value);
        }

        Console.WriteLine("Updated dictionary:");
        foreach (KeyValuePair<string, string> pair in dict)
        {
            Console.WriteLine("{0}: {1}", pair.Key, pair.Value);
        }
    }
}