ASP.NET身份注册新用户以使用UserName作为UserName而不是电子邮件，但仍不显示登录者

public async Task<IActionResult> Register(RegisterViewModel model)
{
    if (ModelState.IsValid)
    {
        var user = new ApplicationUser { UserName = model.UserName, Email = model.Email };
        var result = await _userManager.CreateAsync(user, model.Password);
        if (result.Succeeded)
        {
            // 注册成功后的处理
            return RedirectToAction("Index", "Home");
        }
        foreach (var error in result.Errors)
        {
            ModelState.AddModelError(string.Empty, error.Description);
        }
    }
    // 注册失败的处理
    return View(model);
}

@model RegisterViewModel

<form asp-action="Register" method="post">
    <div class="form-group">
        <label asp-for="UserName">用户名</label>
        <input asp-for="UserName" class="form-control" />
        <span asp-validation-for="UserName" class="text-danger"></span>
    </div>
    <div class="form-group">
        <label asp-for="Email">电子邮件</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">密码</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>

@model LoginViewModel

<form asp-action="Login" method="post">
    <div class="form-group">
        <label asp-for="UserName">用户名</label>
        <input asp-for="UserName" class="form-control" />
        <span asp-validation-for="UserName" class="text-danger"></span>
    </div>
    <div class="form-group">
        <label asp-for="Password">密码</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">登录</button>
</form>