@H_403_1@我的应用程序有一个问题,病例尝试通过示例说明,我有一个表单,这种形式存在几个文本框和下拉列表.为了可重用性,我将3个下拉列表合并到局部视图中,这个部分视图我用@ Html.Action加载,这可以正常工作,当我启动表单时,我看到一切似乎应该是,尽管我不知道为什么,但是那些需要下拉列表直接显示为红色开始,表示为必填字段.

但是当我填写所有内容时,我从下拉列表中选择值,然后单击确定,下拉列表中的值为NULL.

我认为一个代码示例会更容易理解：

主要型号：

public class FormModel
{
    [required]
    public string UserName { get; set; }

    [required]
    [Display(Name = "Birthdate")]
    public DateTime? Birthdate { get; set; }
    //This is what i'm talking about,that is not being set,the location
    public Location Location { get; set; } 
}

这是位置类,然后传递给局部视图,通常我认为应该设置,它看起来像这样：

public class Location
{
    [required]
    [Display(Name = "Country")]
    public string CountryId { get; set; }

    [required]
    [Display(Name = "Region")]
    public string RegionId { get; set; }

    [required]
    [Display(Name = "City")]
    public string CityId { get; set; }
  }

现在我们有一个局部视图的位置：

@model TestWebsite.Models.Location
<tr>
    <td class="editor-label">
        @Html.LabelFor(m => m.CountryId)
    </td>
    <td class="editor-field">
        @Html.DropDownListFor(m => m.CountryId,Model.Countries,"---select--",null)
    </td>
    <td>
        @Html.ValidationMessageFor(m => m.CountryId)
    </td>
</tr>
<!-- Region -->
<tr>
    <td class="editor-label">
        @Html.LabelFor(m => m.RegionId)
    </td>
    <td class="editor-field">
        @Html.DropDownListFor(m => m.RegionId,Enumerable.Empty<SelectListItem>(),null)
    </td>
    <td>
        @Html.ValidationMessageFor(m => m.RegionId)
    </td>
</tr>
<!-- City -->
<tr>
    <td class="editor-label">
        @Html.LabelFor(m => m.CityId)
    </td>
    <td class="editor-field">
        @Html.DropDownListFor(m => m.CityId,null)
    </td>
    <td>
        @Html.ValidationMessageFor(m => m.CityId)
    </td>
</tr>

那么我们将这个局部视图称为这样的形式：

@Html.Action("LocationGroup","Account",Model.Location)

最后在控制器：

[ChildActionOnly]
    public ActionResult LocationGroup(Location model)
    {
        model.Countries = GetCountries();
        return PartialView("_LocationView",model);
    }

我知道这是很多代码,但我希望你能帮助我…

@model TestWebsite.Models.FormModel
@using(Html.BeginForm())
{
    @Html.EditorFor(x => x.Location)
    <input type="submit" value="save"/>
}

@model TestWebsite.Models.Location
<tr>
    <td class="editor-label">
        @Html.LabelFor(m => m.CountryId)
    </td>
    <td class="editor-field">
        @Html.DropDownListFor(m => m.CountryId,null)
    </td>
    <td>
        @Html.ValidationMessageFor(m => m.CityId)
    </td>
</tr>

@Html.EditorFor(x => x.Location,"~/Views/SpecifyLocation/_Location.cshtml")