asp.net MVC中枚举的Html helper

Question

我有两个模型类:

1. Employee.cs

public class Employee
{
public int Id { get; set; } 
public string FirstName { get; set; }
public string LastName { get; set; }
public ProjectType Project { get; set; }
}

ProjectType.cs

public enum ProjectType
{
Project1,
Project2,
Project3,
Project4
}

在Employee的Create视图中，我想显示有可能检查其中几个的项目。

我已经创建了一个foreach循环与Html.RadioButtonFor在创建视图

@model App.Data.Models.Employee
@using App.Data.Models;

@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
}
<div class="form-horizontal">
<div class="form-group">
@Html.LabelFor(model => model.Project, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@foreach (var project in Enum.GetValues(typeof(ProjectType)))
{
<div class="col-md-10">
@Html.RadioButtonFor(m => m.Project, project)
@Html.Label(project.ToString())
</div>
}
</div>
</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>

如果我能够选择多个选项，这将工作得很好。我假设在这种情况下，我应该用Html创建foreach循环。CheckBoxFor，我试着在这个指令中这样做->http://findnerd.com/list/view/How-to-bind-checkbox-with-enum-values-in-MVC/25707/

但它并没有真正起作用:我没有向projectttypes .cs添加任何内容。我在Employee.cs中添加了一个类

public class Employee
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public List<EnumModel> CheckBoxProjectType { get; set; }
}
public class EnumModel
{
public ProjectType ProjectType { get; set; }
public bool isSelected { get; set; }
}

当我在EmployeeController中创建循环时，CheckBoxProjectType用红色下划线表示:

public ActionResult Create()
{
ProjectType model = new ProjectType();
model.CheckBoxProjectType = new List<EnumModel>();
foreach (ProjectType projectType in Enum.GetValues(typeof(ProjectType)))
{
model.CheckBoxProjectType.Add(new EnumModel() { ProjectType = projectType, isSelected = false });
}
return View();
}

在创建视图中，我试图从我之前发布的链接复制循环

@model App.Data.Models.Employee
@using App.Data.Models;

@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
}
<div class="form-horizontal">

<div class="form-group">

<div class="col-md-10">
@for (int i = 0; i < Model.CheckBoxProjectType.Count; i++)
{
@Html.DisplayFor(m => m.CheckBoxProjectType[i].ProjectType);
@Html.CheckBoxFor(m => m.CheckBoxProjectType[i].isSelected);
@Html.HiddenFor(m => m.CheckBoxProjectType[i].ProjectType);
}

@Html.ValidationMessageFor(model => model.ProjectType, "", new { @class = "text-danger" })

</div>
</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>

有人能指导我如何创建foreach循环枚举?

Answer 1

我已经看到错误了- "未定义也未赋值。你是怎么编译这个的?

@Html.LabelFor(m => m.CheckBoxProjectType[i].ProjectType);

用户只是"项目";相反。

我在你的create view和action中也没有看到@model

public ActionResult Create()
{
ProjectType model = new ProjectType();
//Where is your ProjectType class?
// and why I see an Employee AS a model in your view?
......

//you have to change your return to this
return View(model);
}

这是一个更好的主意，创建一个特殊的viewModel像这样使用模型(把它放在一个单独的文件):

public class EmployeeViewModel
{
public Employee Employee{ get; set; }
public List<EnumModel> EnumModels{ get; set; }
}

和你的雇员将是:

public class Employee
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public List<ProjectType > ProjectTypes { get; set; }
}

和新的创建操作将像这样:

public ActionResult Create()
{
var model = new EmployeeViewModel{
Employee=new Employee, 
EnumModels=new List<EnumModel>()
};

foreach (var projectType in Enum.GetValues(typeof(ProjectType)))
{
model.EnumModels.Add(new EnumModel { ProjectType = projectType, 
isSelected = false });
}
return View(model);
}

和在您的创建视图中替换雇员的EmployeeModel(我认为你必须添加一些雇员输入控件太):

@using App.Data.Models
@model EmployeeViewModel

@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
}
<div class="form-horizontal">

<div class="form-group">
<h5> Projects </h5>
<div class="col-md-10">
@for (int i = 0; i < Model.EnumModels.Count; i++)
{
@Html.DisplayFor(m => m.EnumModels[i].ProjectType);
@Html.CheckBoxFor(m => m.EnumModels[i].isSelected);
@Html.HiddenFor(m => m.EnumModels[i].ProjectType);
}

@Html.ValidationMessageFor(model => model.EnumModels, "", new {  
class = "text-danger" })
</div>
</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>

Answer 2

使用以下代码:

public ActionResult Create()
{
Employee model = new Employee();
model.CheckBoxProjectType = new List<EnumModel>();
foreach (ProjectType projectType in Enum.GetValues(typeof(ProjectType)))
{
model.CheckBoxProjectType.Add(new EnumModel() { ProjectType = projectType, isSelected = false });
}
return View(model);
}

和观点:

@using App.Data.Models.Employee;

@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
}
<div class="form-horizontal">

<div class="form-group">
<div class="col-md-10">
@for (int i = 0; i < Model.CheckBoxProjectType.Count; i++)
{
@Html.DisplayFor(m => m.CheckBoxProjectType[i].ProjectType);
@Html.CheckBoxFor(m => m.CheckBoxProjectType[i].isSelected);
@Html.HiddenFor(m => m.CheckBoxProjectType[i].ProjectType);
}
</div>
</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>