为什么在ASP.NET MVC中actionresult方法参数为null? [英] Why actionresult method parameter is null in ASP.NET MVC?
问题描述
我正在尝试将表单发送到ActionResult方法,但它始终为null。
实际上,我得到的错误值不能为null。但我不知道为什么我错了。
这里是ActionResult代码,我的视图和模型。
I'm trying to send a form to ActionResult method but it is null always.
In fact, I got the error Value cannot be null. but I don't know why I got it the error.
Here are ActionResult code, my view, and model.
public class VocabularyController : Controller
{
private VocabContext _context;
public VocabularyController()
{
_context = new VocabContext();
}
// GET: Vocabulary
[Route("New")]
public ActionResult New()
{
return View();
}
[HttpPost]
public ActionResult Save(Vocabulary word)
{
if (ModelState.IsValid)
{
_context.Vocabularies.Add(word);
_context.SaveChanges();
}
return RedirectToAction("dashboard", "Home");
}
}
==============================
@model EnglishTest.Models.Vocabulary
@{
ViewBag.Title = "New";
}
<div class="row">
<div class="col-lg-12">
<div class="element-wrapper">
<h6 class="element-header">New Word Form</h6>
<div class="element-box">
@using (Html.BeginForm("Save", "Vocabulary", FormMethod.Post))
{
<div class="form-group">
@Html.LabelFor(m => m.Word)
@Html.TextAreaFor(m => m.Word, new { @class = "form-control", @placeholder = "Word" })
@Html.ValidationMessageFor(m => m.Word)
</div>
<div class="row">
<div class="col-sm-12">
<div class="form-group">
@Html.LabelFor(m => m.Defination)
@Html.TextAreaFor(m => m.Defination, new { @class = "form-control", @placeholder = "Definition" })
@Html.ValidationMessageFor(m => m.Defination)
</div>
</div>
</div>
<div class="row">
<div class="col-sm-12">
<div class="form-group">
@Html.LabelFor(m => m.Synonym)
@Html.TextAreaFor(m => m.Synonym, new { @class = "form-control", @placeholder = "Synonym" })
@Html.ValidationMessageFor(m => m.Synonym)
</div>
</div>
</div>
<div class="row">
<div class="col-sm-12">
<div class="form-group">
@Html.LabelFor(m => m.PersianTranslate)
@Html.TextAreaFor(m => m.PersianTranslate, new { @class = "form-control", @placeholder = "Persian Translation" })
@Html.ValidationMessageFor(m => m.PersianTranslate)
</div>
</div>
</div>
<div class="row">
<div class="col-sm-12">
<div class="form-group">
@Html.LabelFor(m => m.Examples)
@Html.TextAreaFor(m => m.Examples, new { @class = "form-control", @placeholder = "Examples" })
@Html.ValidationMessageFor(m => m.Examples)
</div>
</div>
</div>
@Html.HiddenFor(m => m.Id)
<div class="form-buttons-w"><button class="btn btn-primary" type="submit"> Save</button></div>
}
</div>
</div>
</div>
</div></div>
==============================
public class Vocabulary
{
public int Id { get; set; }
[Required]
public string Word { get; set; }
[Required]
public string Defination { get; set; }
[Required]
public string Synonym { get; set; }
[Required]
public string PersianTranslate { get; set; }
[Required]
public string Examples { get; set; }
}
我尝试过:
我想将表单发送到asp.net MVC中的actionResutl方法。
What I have tried:
I wanna send a form to an actionResutl method in asp.net MVC.
推荐答案
我会尝试改变m =>米到model =>模型。
Hi,
I would try changing m => m. to model => model.
@Html.TextAreaFor(m => m.Word, new { @class = "form-control", @placeholder = "Word" })
@Html.ValidationMessageFor(m => m.Word
例如:
Such as:
@Html.TextAreaFor(model => model.Word, new { @class = "form-control", @placeholder = "Word" })
@Html.ValidationMessageFor(model => model.Word
和
And
public ActionResult Save(Vocabulary word)
到
to
public ActionResult Save(Vocabulary model
另外从本文中可以看出
从MVC中获取数据从视图到控制器 [ ^ ]
请注意,模型很可能= >是控制器动作中预期的名称......但是我不确定这是否真的是mvc的工作方式,尽管它应该以这种方式发布值。
Also as you can see from this article
Getting Data From View to Controller in MVC[^]
Note that most likely the model => is the name expected in the controller action...but I'm not sure if this is actually how mvc works although it should post values this way.
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