Question

我刚刚开始使用MVC，而且我正处于学习阶段。我目前仍然遇到这个问题。在我的洗礼中，我得到了这两张桌子。

TopicTable -TopId -TopName

ContentTable -ContId -TopId -content

我希望我能够在Topic Detailes视图中创建新内容。
在detailes.cshtml文件中，我添加了：

@Html.ActionLink("Create New Content", "Create", "Content", new { ID = Model.TopicId}, null)` which will display in URL: localhost/Content/Create/1

在我的ContentController中，我得到了这个，并且在提交＆＃34; 一个或多个实体的验证失败时收到此错误。请参阅＆＃39; EntityValidationErrors＆＃39;财产了解更多详情。＆＃34;

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(int Id)
        {
            ContentModel content = new ContentModel();
            if (ModelState.IsValid)
            {
                content.TopId = Id;
                db.ContentModel.Add(content);
                db.SaveChanges();
                return RedirectToAction("Index");

            }
            return View(content)
        }

观点：

@model WebApplication2.Models.ContentModel

@{
    ViewBag.Title = "Create";
}

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>JobOfferModel</h4>
        <hr />
        @Html.ValidationSummary(true)
 <div class="form-group">
            @Html.LabelFor(model => model.Content, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Content)
                @Html.ValidationMessageFor(model => model.Content)
            </div>
        </div>

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

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

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

型号：

public class Topic
{
[Display(Name = "Id")]
        public virtual int TopicId{ get; set; }
        [Display(Name = "Name")]
        public virtual string TopicName{ get; set; }


}

 public class Content
{
[Display(Name = "Id")]
        [Display(Name = "Id")]
    public virtual int ContentId{ get; set; }
    [Display(Name = "TopicId")]
    public virtual string TopicId{ get; set; }
    [AllowHtml]
    [Display(Name = "Innihald")]
    public virtual string Content { get; set; }


}

因此，当我创建新内容时，topId值将自动添加到内容表中。

希望得到一些帮助，格拉西亚斯

Answer 1

@Html.ActionLink()是对GET方法的调用。您需要GET才能返回呈现表单的视图，以及POST方法来接收和保存表单数据

public ActionResult Create(int ID)
{
  Content model = new Content();
  model.TopicId = ID; // note TopicId should be int, not string
  return View(model);
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Content model)
{
  if(!ModelState.IsValid)
  {
    return View(model);
  }
  // save your model and redirect.
}

查看（省略了div等）

@model WebApplication2.Models.Content
....
@using (Html.BeginForm()) 
{
  @Html.AntiForgeryToken()
  @Html.ValidationSummary(true)
  @Html.HiddenFor(m => m.TopicId) // for postback
  @Html.LabelFor(model => model.Content, new { @class = "control-label col-md-2" })
  @Html.TextBoxFor(model => model.Content)
  @Html.ValidationMessageFor(model => model.Content)
  <input type="submit" value="Create" class="btn btn-default" />
}
....

在MVC中从URL添加ID

1 个答案: