Asp.Net MVC 5 Html.DropDownList无法验证 [英] Asp.Net MVC 5 Html.DropDownList is not validating

问题描述

我已经在这个问题上停留了一段时间了，似乎找不到任何有用的在线信息.

I've been stuck on this problem for a while now and can't seem to find anything online that helps.

我在编辑器模板中有一个Html.DropDownList.我在表单中使用该模板，但没有为下拉列表选择任何内容.当我单击提交时，我希望表单通知我所需的下拉列表没有选择值，但没有选择.我究竟做错了什么?

I have a Html.DropDownList in an Editor Template. I use that template in my form and don't select anything for the dropdownlist. When I click submit, I expect the form to notify me that the required dropdownlist doesn't have a value selected, but it doesn't. What am I doing wrong?

以下是视图模型:

public class RequestCreateViewModel
{
    public int ID { get; set; }

    public TesterLocationCreateViewModel TesterLocationCreateViewModel { get; set; }

    ....

    public RequestCreateViewModel()
    {

    }
}

public class TesterLocationCreateViewModel
{
    public int ID { get; set; }

    [Required]
    [UIHint("OEM")]
    public string OEM { get; set; }

    [Required]
    [DisplayName("City")]
    public string LocationCity { get; set; }


    public TesterLocationCreateViewModel()
    {

    }
}

这是Create.cshtml的代码段

Here's a snippet of the Create.cshtml

 @model WdcTesterManager.Models.Request

 @{
     ViewBag.Title = "Create Request";
     Layout = "~/Views/Shared/_Layout.cshtml";
 }

 <h2>Create Request</h2>

 @using (Html.BeginForm())
 {
       @Html.AntiForgeryToken()
       <div class="form-horizontal">
          @Html.ValidationSummary(true, "", new { @class = "text-danger" })
          <div class="form-group">
              @Html.EditorFor(model => model.TesterLocationCreateViewModel)
          </div>
       </div>
 }

这是TesterLocationCreateViewModel.cshtml(编辑器模板):

Here's the TesterLocationCreateViewModel.cshtml (Editor Template):

@model WdcTesterManager.Models.TesterLocationCreateViewModel

    <div class="col-md-6">
        <h4>Tester Location</h4>
        <div class="container-fluid">
            <div class="form-group">
                @Html.LabelFor(model => model.OEM, htmlAttributes: new { @class = "control-label col-md-4" })
                <div class="col-md-8">
                     @Html.DropDownList("OEM", (SelectList)ViewBag.OemList, "Choose one", new { @class = "form-control" })
                    @Html.ValidationMessageFor(model => model.OEM, "", new { @class = "text-danger" })
                </div>
            </div>               
            <div class="form-group">
                @Html.LabelFor(model => model.LocationCity, htmlAttributes: new { @class = "control-label col-md-4" })
                <div class="col-md-8">
                    @Html.EditorFor(model => model.LocationCity, new { htmlAttributes = new { @class = "form-control" } })
                    @Html.ValidationMessageFor(model => model.LocationCity, "", new { @class = "text-danger" })
                </div>
            </div>               
        </div>
    </div>

当我提交表格而没有填写任何内容时，我得到了纽约市的验证错误，但没有收到OEM的验证错误.有什么想法吗?

When I submit the form without filling anything out, I get a validation error for the City but nothing for the OEM. Any ideas?

推荐答案

@StephenMuecke指出代码看起来有些问题，因为代码似乎是在引用请求模型而不是请求视图模型.

@StephenMuecke pointed out that something looked wrong with the code, since the code seemed to be referencing the Request model rather than the Request View model.

因此，我再次查看了代码，并意识到Create.cshtml使用的是Request模型而不是RequestCreateViewModel.

So, I took a second look at the code and realized that the Create.cshtml was using the Request model rather than the RequestCreateViewModel.

将Create.cshtml更改为使用RequestCreateViewModel后，我得到了正确的验证错误:

I'm getting the correct validation errors after changing the Create.cshtml to use the RequestCreateViewModel:

@model WdcTesterManager.Models.RequestCreateViewModel

这篇关于Asp.Net MVC 5 Html.DropDownList无法验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！