无法在.NET核心中验证表单

// 模型类
public class RegistrationModel
{
    [Required(ErrorMessage = "姓名是必填项")]
    public string Name { get; set; }

    [Required(ErrorMessage = "邮箱是必填项")]
    [EmailAddress(ErrorMessage = "请输入有效的邮箱地址")]
    public string Email { get; set; }

    [Required(ErrorMessage = "密码是必填项")]
    [MinLength(6, ErrorMessage = "密码长度不能少于6个字符")]
    public string Password { get; set; }
}

// 控制器
public class RegistrationController : Controller
{
    [HttpGet]
    public IActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public IActionResult Index(RegistrationModel model)
    {
        if (ModelState.IsValid)
        {
            // 执行注册逻辑
            return RedirectToAction("Success");
        }
        return View(model);
    }

    public IActionResult Success()
    {
        return View();
    }
}

// 视图
@model RegistrationModel

<form asp-action="Index" method="post">
    <div asp-validation-summary="ModelOnly" class="text-danger"></div>
    <div class="form-group">
        <label asp-for="Name"></label>
        <input asp-for="Name" class="form-control" />
        <span asp-validation-for="Name" class="text-danger"></span>
    </div>
    <div class="form-group">
        <label asp-for="Email"></label>
        <input asp-for="Email" class="form-control" />
        <span asp-validation-for="Email" class="text-danger"></span>
    </div>
    <div class="form-group">
        <label asp-for="Password"></label>
        <input asp-for="Password" class="form-control" />
        <span asp-validation-for="Password" class="text-danger"></span>
    </div>
    <button type="submit" class="btn btn-primary">注册</button>
</form>