我是asp.net的新手，但我在创建一个简单的Edit方法时遇到了很多麻烦。我已经搜索了很多，但它没有任何帮助。虽然我已经看到这个问题，但没有答案与我的情况有关。
我已经制作了创建方法，但在编辑方法中，从表单中检索数据后，所有属性都会为空或者为0。
我已经花了两天时间，并且不知道该怎么做。请告知。
这些是控制器的两种方法
public IActionResult Edit(int? id)
{
if (id == null)
{
return HttpNotFound();
}
Question question = _context.questions.Single(m => m.id == id);
if (question == null)
{
return HttpNotFound();
}
return View(question);
}
[HttpPost]
public IActionResult Edit( Question question)
{
if(question.id == 0)
return HttpNotFound();
// _context.questions.Attach(question);
// _context.Entry(question).State = EntityState.Modified;
// _context.SaveChangesAsync();
return RedirectToAction("Index");
}
视图的形式
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Edit</title>
</head>
<body>
<form asp-action="Edit" method="post" >
<div class="form-horizontal">
<h4>Question</h4>
<hr />
<div asp-validation-summary="ValidationSummary.ModelOnly" class="text-danger"></div>
<div class="form-group">
<input asp-for="id" class="form-control" />
</div>
<div class="form-group">
<label asp-for="question" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="question" class="form-control" />
<span asp-validation-for="question" class="text-danger" />
</div>
</div>
<div class="form-group">
<label asp-for="title" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="title" class="form-control" />
<span asp-validation-for="title" class="text-danger" />
</div>
</div>
<div class="form-group">
<label asp-for="answer" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="answer" class="form-control" />
<span asp-validation-for="answer" 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>
</form>
<div>
<a asp-action="Index">Back to List</a>
</div>
@section Scripts {
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
}
</body>
</html>
命名空间Daycare.Models { 公共课问题 {
public Question() {
}
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int id { get; set; }
public string title { get;set;}
public string question { get; set; }
public string answer { get; set; }
public DateTime date { get; set; }
}
}
模型只是一个非常简单的东西，有一个Int Id和一些字符串属性。
请告诉我，为什么这个错误会产生影响？
答案 0 :(得分：2)
您的输入没有名称，并且您没有使用Razor的帮助程序来创建它们，这就是您的模型在HttpPost Edit方法中为空的原因。
以下是编辑视图的示例：
@model ControleDeProducaoWeb.Models.EquipamentosViewModel
<h2>@ViewBag.Title</h2>
<hr />
@using (Html.BeginForm("Save", ViewContext.RouteData.Values["controller"].ToString(), FormMethod.Post, new { @class = "form-horizontal" }))
{
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<label class="col-sm-3 control-label">Id</label>
<div class="col-sm-4">
@Html.TextBoxFor(x => x.Id, new { @class = "form-control", @disabled = "disabled" })
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Coligada</label>
<div class="col-sm-4">
@Html.DropDownListFor(x => x.ColigadaId, ViewData.Model.Coligadas, new { @class = "form-control", @id = "lista-coligadas" })
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Filial</label>
<div class="col-sm-4">
@Html.DropDownListFor(x => x.FilialId, ViewData.Model.Filiais, new { @class = "form-control", @id = "lista-filiais" })
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Cala Mínima</label>
<div class="col-sm-4">
@Html.TextBoxFor(x => x.CalaMin, new { @class = "form-control" })
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Cala Máxima</label>
<div class="col-sm-4">
@Html.TextBoxFor(x => x.CalaMax, new { @class = "form-control" })
</div>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<label class="col-sm-3 control-label">Comprimento Máximo</label>
<div class="col-sm-4">
@Html.TextBoxFor(x => x.ComprimentoMax, new { @class = "form-control" })
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Altura Máxima</label>
<div class="col-sm-4">
@Html.TextBoxFor(x => x.AlturaMax, new { @class = "form-control" })
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Largura Máxima</label>
<div class="col-sm-4">
@Html.TextBoxFor(x => x.LarguraMax, new { @class = "form-control" })
</div>
</div>
<div class="form-group">
<div class="col-sm-4 col-sm-offset-3">
<a href="@Request.UrlReferrer.AbsoluteUri" class="btn btn-danger pull-right">Cancelar</a>
<button class="btn btn-success" type="submit">Salvar</button>
</div>
</div>
</div>
</div>
}
答案 1 :(得分：0)
这似乎是一个错误。 创建一个viewmodel并使用它来帮助模型。
对于迟到的帖子抱歉