将枚举传递给 MVC3 的 html.radiobutton

Question

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

public enum ActionStatus
{
    Open,
    Closed
}

我想在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 a) 创建视图中的默认值b) 编辑视图中当前选择的选项。

我是否需要为此提供一个扩展方法，有人已经创建了一个吗？

编辑：在达林斯的回答之后，这是我的模型类

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
}

，这是我的视图

@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，但当前选择的选项不会保留到数据库中

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());
        }
    }
}    

您还可以强制执行 此辅助方法的枚举类型的通用约束。

然后：

模型：

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);
    }
}

视图：

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

Answer 2

只需添加单选按钮

    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());
    }
}

和模型的标签：

    public enum MeetingActionStatus                   
{

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

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