将选择/下拉项的值传递给控制器​​仅接收 0

Question

我已经成功创建了一个视图来显示一些投票记录。但在同一个视图上，我尝试调用控制器上的另一个方法来导出这些记录，但它只接收 0 作为参数。这是我的模型。public class Vote    {        public int Id { get; set; }        public int CPF { get; set; }        public virtual Candidate Candidate { get; set; }        public int CandidateID { get; set; }        public DateTime Moment { get; set; }}这是我的索引。public async Task<IActionResult> Index()        {            var context = _context.Vote.Include(v => v.Candidate).Include(v => v.Candidate.Election);            //This is going to be on the view for the user to select the year to export data            ViewData["Election"] = new SelectList(_context.Election, "Id", "Year");            return View(await context.ToListAsync());        }这就是我试图呼吁的行动。[HttpPost]public IActionResult Export(int electionYear)这是我用来发布到控制器的表单。@model IEnumerable<Models.Vote>...//Here i show the votes and then below i show this form with the Elections<form asp-action="Export">    <div class="form-group">        <select class="form-control" asp-items="ViewBag.Election"></select>    </div>    <div class="form-group">        <input type="submit" value="Exportar" class="btn btn-default" />    </div></form>我用 [FormBody] 尝试过，它给了我 415 错误

Answer 1

Export 端点需要一个名为 electionYear 的表单值。但您的 <select> 没有 name （或任何 name）。尝试：

<select name="electionYear" class="form-control" asp-items="ViewBag.Election"></select>