问通过asp-for="...“传递字符串值到ASP.Net核心中的模型的工作方式不是它应该的方式

EN

<hr />
<div class="row">
    <div class="col-md-4">
        <form method="post">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="Userdata.Username" class="control-label"></label>
                <input asp-for="Userdata.Username" class="form-control" required />
                <span asp-validation-for="Userdata.Username" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Password1" class="control-label">Password</label>
                <input asp-for="Password1" class="form-control" type="password" required />
                <span asp-validation-for="Password1" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Password2" class="control-label">Password</label>
                <input asp-for="Password2" class="form-control" type="password" required />
                <span asp-validation-for="Password2" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Userdata.Role" class="control-label"></label>
                <input asp-for="Userdata.Role" class="form-control" required />
                <span asp-validation-for="Userdata.Role" class="text-danger"></span>
            </div>`
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

      [BindProperty]
        public Userdata Userdata { get; set; }

        public String Password1 { get; set; }
        public String Password2 { get; set; }


        // To protect from overposting attacks, enable the specific properties you want to bind to, for
        // more details, see https://aka.ms/RazorPagesCRUD.
        public async Task<IActionResult> OnPostAsync()
        {

            if (!ModelState.IsValid)
            {
                return Page();
            }

            if (Password1 != Password2)
            {
                errormessage = "Passwords don't Match";
                return null;
            }