Question

嗨，我的观点有误

如您所见，有一个输入和一个选择选项

<div class="form-group">
    <label asp-for="DomWasLoc" class="control-label"></label>
    <input asp-for="DomWasLoc" class="form-control" id="firstname" name="firstname" />
    <select class="form-control"
        id="name" name="name"
        asp-items="@(new SelectList(ViewBag.LocationList, "LocName","LocName"))">
        <option value="">- Select -</option>
    </select>
    <span asp-validation-for="DomWasLoc" class="text-danger"></span>
</div>

每次在下拉列表上选择一个项目时，就会在输入框中输入所选项目的值。

但是每次我单击“提交”时，我总是显示此错误

Create.cshtml中的AspNetCore._Views_DomesticWastes_Create_cshtml + d__25.MoveNext（） + asp-items =“ @（new SelectList（ViewBag.LocationList，” LocName“，” LocName“））”>

我应该怎么做，以便在我单击“提交”时忽略选择内容，而仅从输入框中添加数据？

先谢谢大家！：）

Answer 1

对于相同的字段input，无需将select和DomWasLoc组合在一起。您可以将DomWasLoc直接绑定到select。

演示代码如下：

            <div class="form-group">
            <label asp-for="DomWasLoc" class="control-label"></label>
            @*<input asp-for="DomWasLoc" class="form-control" />*@
            <select class="form-control"
                    asp-for="DomWasLoc"
                    asp-items="@(new SelectList(ViewBag.LocationList, "LocName","LocName"))">
                <option value="">- Select -</option>
            </select>
            <span asp-validation-for="DomWasLoc" class="text-danger"></span>
        </div>

更新：

完整代码：
1.型号

    public class Location
{
    public int Id { get; set; }
    public string LocName { get; set; }
}
public class DomesticWaste
{
    public int Id { get; set; }
    public string DomWasLoc { get; set; }
}

控制器

// GET: DomesticWastes/Create
public IActionResult Create()
{
    List<Location> locationlist = new List<Location>() {
        new Location{ Id = 1,  LocName = "L1" },
        new Location{ Id = 2,LocName = "L2" },
        new Location{ Id = 3,LocName = "L3" }
    };
    ViewBag.LocationList = locationlist;

    return View();
}

// POST: DomesticWastes/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for 
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("Id,DomWasLoc")] DomesticWaste domesticWaste)
{
    if (ModelState.IsValid)
    {
        _context.Add(domesticWaste);
        await _context.SaveChangesAsync();
        return RedirectToAction(nameof(Index));
    }
    return View(domesticWaste);
}

下拉列表[asp.net core 2.0]

1 个答案: