将枚举传递给 html.radiobuttonfor MVC3

Question

我有一个名为 ActionStatus 的枚举，它有 2 个可能的值 open=0 和 closed = 1

public enum ActionStatus
{
    Open,
    Closed
}

我想在我的编辑中构建单选按钮组并创建使用枚举来填充单选按钮的视图，其中 a) 创建视图中的默认值和 b) 编辑视图中当前选择的选项。

我需要一个扩展方法吗？有人已经创建了吗？

编辑：在下面达林斯的回答之后，这是我的模型课

namespace Actioner.Models
{
[MetadataType(typeof(MeetingActionValidation))]
public class MeetingAction
{
    [Key]
    public int MeetingActionId              { get; set; }       

    [Required]
    [Display(Name = "Description")]
    public string Description  { get; set; }

    [Required]
    [Display(Name = "Review Date")]
    public DateTime ReviewDate       { get ;set; }

    public int Status{ get; set; }

    [ScaffoldColumn(false)]
    public int MeetingId             { get; set; }


    //public virtual Meeting Meeting { get; set; }

    //public virtual ICollection<User> Users { get; set; }
    public virtual ICollection<ActionUpdate> ActionUpdates { get; set; }

    public MeetingActionStatus ActionStatus { get; set; }

}

public enum MeetingActionStatus 
{
    Open,
    Closed
}

这是我的观点

@model Actioner.Models.MeetingAction
@using Actioner.Helpers


<div class="editor-label">
@Html.LabelFor(model => model.Description)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Description)
@Html.ValidationMessageFor(model => model.Description)
</div>

<div class="editor-label">
@Html.LabelFor(model => model.ReviewDate)
</div>
 <div class="editor-field">
@Html.EditorFor(model => model.ReviewDate)
@Html.ValidationMessageFor(model => model.ReviewDate)
</div>

<div class="editor-label">
@Html.LabelFor(model => model.Status)
</div>
<div class="editor-field">

 @Html.RadioButtonForEnum(x => x.ActionStatus)

</div>

这是我的创建控制器操作

public virtual ActionResult Create(int id)
    {

        var meetingAction = new MeetingAction
        {
            MeetingId = id,
            ReviewDate = DateTime.Now.AddDays(7)
        };

        ViewBag.Title = "Create Action"; 

        return View(meetingAction);
    } 

枚举在视图中显示正常，但当前选择的选项没有持久化到数据库中

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;

namespace YourNamespace
{
    public static class HtmlExtensions
    {
        public static MvcHtmlString RadioButtonForEnum<TModel, TProperty>(
            this HtmlHelper<TModel> htmlHelper, 
            Expression<Func<TModel, TProperty>> expression
        )
        {
            var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
            var names = Enum.GetNames(metaData.ModelType);
            var sb = new StringBuilder();
            foreach (var name in names)
            {
                var id = string.Format(
                    "{0}_{1}_{2}", 
                    htmlHelper.ViewData.TemplateInfo.HtmlFieldPrefix, 
                    metaData.PropertyName, 
                    name
                );

                var radio = htmlHelper.RadioButtonFor(expression, name, new { id = id }).ToHtmlString();
                sb.AppendFormat(
                    "<label for=\"{0}\">{1}</label> {2}", 
                    id, 
                    HttpUtility.HtmlEncode(name), 
                    radio
                );
            }
            return MvcHtmlString.Create(sb.ToString());
        }
    }
}    

您还可以为此帮助方法强制使用generic constraint to an enum type。

然后：

型号：

public enum ActionStatus
{
    Open,
    Closed
}

public class MyViewModel
{
    public ActionStatus Status { get; set; }
}

控制器：

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View(new MyViewModel
        {
            Status = ActionStatus.Closed
        });
    }

    [HttpPost]
    public ActionResult Index(MyViewModel model)
    {
        return View(model);
    }
}

查看：

@model MyViewModel
@using (Html.BeginForm())
{
    @Html.RadioButtonForEnum(x => x.Status)
    <input type="submit" value="OK" />
}

Answer 2

只需为单选按钮添加标签

    public static class HtmlExtensions
{
    public static MvcHtmlString RadioButtonForEnum<TModel, TProperty>(
        this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TProperty>> expression
    )
    {
        var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);

        var names = Enum.GetNames(metaData.ModelType);
        var sb = new StringBuilder();
        foreach (var name in names)
        {

            var description = name;

            var memInfo = metaData.ModelType.GetMember(name);
            if (memInfo != null)
            {
                var attributes = memInfo[0].GetCustomAttributes(typeof(DisplayAttribute), false);
                if (attributes != null && attributes.Length > 0 )
                    description = ((DisplayAttribute)attributes[0]).Name;
            }
            var id = string.Format(
                "{0}_{1}_{2}",
                htmlHelper.ViewData.TemplateInfo.HtmlFieldPrefix,
                metaData.PropertyName,
                name
            );

            var radio = htmlHelper.RadioButtonFor(expression, name, new { id = id }).ToHtmlString();
            sb.AppendFormat(
                "<label for=\"{0}\">{1}</label> {2}",
                id,
                HttpUtility.HtmlEncode(description),
                radio
            );
        }
        return MvcHtmlString.Create(sb.ToString());
    }
}

和模型：

    public enum MeetingActionStatus                   
{

    [Display(Name = "Open meeting")]
    Open,

    [Display(Name = "Closed meeting")]
    Closed             
}