如何在.net Core2.2中登录Program.Main？

using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Threading.Tasks;

namespace YourNamespace
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            // 创建一个新的 .NET Core 2.2 项目时，已经包含了以下代码，无需重复添加
            var services = new ServiceCollection();
            services.AddIdentity<IdentityUser, IdentityRole>()
                .AddDefaultTokenProviders();
            // 添加其他服务和配置

            var serviceProvider = services.BuildServiceProvider();

            // 获取 UserManager 实例
            var userManager = serviceProvider.GetService<UserManager<IdentityUser>>();

            // 用户登录
            var user = await userManager.FindByNameAsync("username");
            var signInResult = await serviceProvider.GetService<SignInManager<IdentityUser>>()
                .PasswordSignInAsync(user, "password", false, lockoutOnFailure: false);

            if (signInResult.Succeeded)
            {
                // 登录成功后的操作
                Console.WriteLine("登录成功！");
            }
            else
            {
                // 登录失败的操作
                Console.WriteLine("登录失败！");
            }
        }
    }
}