ASP.NET MVC 5 Html.CheckboxFor 仅在发布时返回默认值

Question

我已阅读教程并为该页面准备了一个复选框列表。提交表单时，Selected 属性仅获取值 false。 有什么我错过的吗？ 模型

public class SelectStudentModel
{           
    public int StudentID { get; set; }    
    public string CardID { get; set; }    
    public string Name { get; set; }    
    public bool Selected { get; set;}
}

视图模型

public class SelectStudentViewModel
{
    public List<SelectStudentModel> VMList;
    public SelectStudentViewModel()
    {
        VMList = SelectStudentModel.GETStudent();
    }
}

观点

@using Student.Models
@model SelectStudentViewModel
@using (Html.BeginForm("AddStudent", "SectionStudent", FormMethod.Post, new { @role = "form" }))
{
    @{ for (int i = 0; i < Model.VMList.Count(); i++)
    {
        <tr>
            <td>@Html.CheckBoxFor(m => m.VMList[i].Selected)</td>
            <td>@Html.DisplayFor(model => model.VMList[i].Name)</td>
        </tr>
    }
}
 <input type="submit" value="submit" />
}@* end form *@

发布数据的控制器

[HttpPost]
public ActionResult AddStudent(SelectStudentViewModel model)
{
    foreach (SelectStudentModel m in model.VMList)
    {
        Console.Write(m.Selected.ToString());
    }
    return PartialView("StudentSelectForm", model);
}

Answer 1

VMList 是 SelectStudentViewModel 模型中的一个字段。您需要将其更改为属性（使用 getter/setter），以便 DefaultModelBinder 可以设置值

public class SelectStudentViewModel
{
    public List<SelectStudentModel> VMList { get; set; } // change
    public SelectStudentViewModel()
    {
        VMList = SelectStudentModel.GETStudent();
    }
}

旁注：建议您将@Html.DisplayFor(model => model.VMList[i].Name) 更改为@Html.LabelFor(m => m.VMList[i].Selected, Model.MList[i].Name)，以便获得与复选框关联的标签