使用编辑时让我的表单自动填充

Question

对 mvc 很陌生。我的问题是当我有一条记录要编辑时，我的视图不会自动填写表格。具体来说，我正在尝试在拍卖网站上出价。我希望其他一切保持不变，只更新出价。如果我的表单没有自动填充，那么一切都将为空。任何帮助将不胜感激。

this is from the CarAuctionController


        // GET: CarAuction/Edit/5
        public ActionResult Edit(int id= 3)
        {
            
            CarList carList = db.CarLists.Find(id);
            
            return View();
        }

        // POST: CarAuction/Edit/5
        [HttpPost]
        public ActionResult Edit(CarList carlist)
        {
            try
            {
                // TODO: Add update logic here

                if (ModelState.IsValid)
                {
                    db.Entry(carlist).State=EntityState.Modified;
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }

                return View("Index");
            }
            catch
            {
                return View();
            }
        }



this is from the view Edit.cshtml

@model ClassicCarAuction.CarList

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>


@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>CarList</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.ID)

        <div class="form-group">
            @Html.LabelFor(model => model.ModelYear, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ModelYear, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ModelYear, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Make, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Make, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Make, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Model, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Model, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Model, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.CarImage, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.CarImage, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.CarImage, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.DatePosted, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.DatePosted, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.DatePosted, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.AuctionEndDate, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.AuctionEndDate, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.AuctionEndDate, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ReserveBid, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ReserveBid, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ReserveBid, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.PosterUserID, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.PosterUserID, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.PosterUserID, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ViewingLocation, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ViewingLocation, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ViewingLocation, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.HighestBid, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.HighestBid, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.HighestBid, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.HighBidUserId, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.HighBidUserId, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.HighBidUserId, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Status, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Status, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Status, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

Answer 1

问题是你返回了"view"，但是你没有提供引擎可以将它们绑定在一起的"model"，因此默认为空。

return View("Index");

应该是

return View("Index", carlist);

Answer 2

您没有将检索到的 carlist 模型传递给视图。因此视图无法访问模型并且无法填写表单。

// GET: CarAuction/Edit/5
public ActionResult Edit(int id= 3)
{

    CarList carList = db.CarLists.Find(id);

    // Change this:
    return View(carList);
}

使用编辑时让我的表单自动填充

getting my form to autofill when editing using

c#

asp.net-mvc

edit

razor