如何从appsettings.json填充字典？

{
  "MySettings": {
    "Key1": "Value1",
    "Key2": "Value2"
  }
}

public class MySettings
{
    public Dictionary<string, string> Settings { get; set; } = new Dictionary<string, string>();
}

using Microsoft.Extensions.Configuration;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

        IConfiguration config = builder.Build();

        var mySettings = config.GetSection("MySettings").Get<MySettings>();

        foreach (var key in mySettings.Settings.Keys)
        {
            Console.WriteLine($"Key: {key}, Value: {mySettings.Settings[key]}");
        }
    }
}