如何在通过HTTPClientFactory创建的HTTPClient实例中访问CookieContainer

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

public class CookieHandler : DelegatingHandler
{
    private readonly CookieContainer _cookieContainer = new CookieContainer();

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        // 将 CookieContainer 添加到请求中
        request.Headers.AddCookies(_cookieContainer);

        var response = await base.SendAsync(request, cancellationToken);

        // 处理响应中的 Cookie
        if (response.IsSuccessStatusCode)
        {
            var cookies = response.Headers.GetValues("Set-Cookie");
            if (cookies != null)
            {
                foreach (var cookie in cookies)
                {
                    _cookieContainer.SetCookies(request.RequestUri, cookie);
                }
            }
        }

        return response;
    }
}

public class Program
{
    public static async Task Main(string[] args)
    {
        var httpClientFactory = new HttpClientFactory();
        var httpClient = httpClientFactory.CreateClient(new() { Handler = new CookieHandler() });

        var response = await httpClient.GetAsync("https://example.com");
        response.EnsureSuccessStatusCode();

        // 访问 CookieContainer
        var cookieHandler = (CookieHandler)httpClient.Handler;
        var cookies = cookieHandler._cookieContainer.GetCookies(new Uri("https://example.com"));
        foreach (var cookie in cookies)
        {
            Console.WriteLine(cookie.Name + "=" + cookie.Value);
        }
    }
}