通过枚举到html.radiobuttonfor MVC3 [英] pass enum to html.radiobuttonfor MVC3

问题描述

我有一个Enum被称为ActionStatus，它有2个可能的值open = 0并且closed = 1

I Have an Enum Called ActionStatus that has 2 possible values open=0 and closed = 1

public enum ActionStatus
{
    Open,
    Closed
}

我想在我的编辑中创建单选按钮组，并创建使用枚举填充单选按钮的视图：a）创建视图中的默认值，以及b）编辑视图中当前选定的选项。

I want to build radio button group in my edit and create views that uses the enum to populate the radio buttons with a) a default value in the create view and b) the currently selected option in the edit view.

我需要一个扩展方法，有没有人已经创建了一个？

Do i need an extension method for this, and has anybody already created one?

编辑：在Darins的答案之后，这是我的Model类

After Darins's answer below this is my Model class

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，但当前选定的选项不会保留到数据库

The enum displays fine in the view, but the currently selected option is not persisted to the database

推荐答案

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<枚举类型的一般约束href =http://msmvps.com/blogs/jon_skeet/archive/2009/09/10/generic-constraints-for-enums-and-delegates.aspx =noreferrer> 这个帮助方法。

You could also enforce a generic constraint to an enum type for this helper method.

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" />
}

这篇关于通过枚举到html.radiobuttonfor MVC3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！