如何从 ASP.NET Core MVC 中的数据库中获取相关数据

我是该类型开发的新手，我想知道如何获取相关数据。

我有 2 张桌子AspNetUsers和Accounts. 在Accounts表中只有 3 列Id，UserId连接AspNetUsers表和Amount. 所以，我想做的就是获取当前登录用户的这个帐户信息。

我正在尝试在文档中找到的东西，它可以工作，但显示出奇怪的结果：

Index.cshtml:

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}
@using Microsoft.AspNetCore.Identity
@inject SignInManager<IdentityUser> SignInManager
@inject UserManager<IdentityUser> UserManager
@{
    var user = await UserManager.GetUserAsync(User);
}

@if (SignInManager.IsSignedIn(User))
{
<div class="text-center">
    <h1 class="display-4">Welcome back, @(user.Email.Split("@")[0])</h1>
</div>
<div>
    <h5>Your balance: @Html.DisplayNameFor(model => model.account)</h5>
</div>
}
else
{
<div class="text-center">
    <h1 class="mb-3">Welcome, new one here? Go on and create account!</h1>
</div>
}

Index.cshtml.cs:

public class IndexModel : PageModel
    {
        private readonly ILogger<IndexModel> _logger;
        private readonly WebBankDbContext _context;
        private readonly UserManager<IdentityUser> userManager;
        private readonly SignInManager<IdentityUser> signInManager;

        public IdentityUser user;
        public Account account;

        public IndexModel(SignInManager<IdentityUser> signInManager, UserManager<IdentityUser> userManager, ILogger<IndexModel> logger, WebBankDbContext context)
        {
            _logger = logger;
            _context = context;
            this.userManager = userManager;
            this.signInManager = signInManager;
        }

        public async Task OnGetAsync()
        {
            if (signInManager.IsSignedIn(User))
            {
                user = await userManager.GetUserAsync(User);
                account = (from st in _context.Accounts where st.UserId == user.Id select st).First();
            }
        }
    }

我正在用断点调试这段代码，发现里面有正确的信息account，但在页面上显示如下：

Your balance: account

怎么了？我怎样才能解决这个问题？谢谢。