如何使枚举的默认编辑器模板？ [英] How to make a default editor template for enums?

问题描述

如何为枚举设置默认编辑器模板？我的意思是：我可以这样做：

How can I make a default editor template for enums? By which I mean: can I do something like this:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Enum>" %> 
<% -- any code to read the enum and write a dropdown -->

并将其放在EditorTemplates文件夹中，名称为 Enum.ascx ？

And put this in the EditorTemplates folder under the name Enum.ascx?

以下是我尝试过的问题的解决方法，但这不是我需要的。

Here's a workaround for my problem that I tried, but it's not what I need.

这是我的枚举：

public enum GenderEnum
{
    /// <summary>
    /// Male
    /// </summary>
    [Description("Male Person")]
    Male,

    /// <summary>
    /// Female
    /// </summary>
    [Description("Female Person")]
    Female
}

我创建了一个名为 GenderEnum.acsx 的模板，并将其放在 Shared / EditorTemplates 文件夹中。这是模板：

I made a template called GenderEnum.acsx and put it in the Shared/EditorTemplates folder. Here is the Template:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<AlefTech.HumanResource.Core.GenderEnum>" %>
<%@ Import Namespace="AlefTech.HumanResource.WebModule.Classes" %>
<%=Html.DropDownListFor(m => m.GetType().Name, Model.GetType()) %>

当然这个方法是我自己的：

Of course the method is my own:

public static class HtmlHelperExtension
    {
        public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, Type enumType)
        {
            List<SelectListItem> list = new List<SelectListItem>();
            Dictionary<string, string> enumItems = enumType.GetDescription();
            foreach (KeyValuePair<string, string> pair in enumItems)
                list.Add(new SelectListItem() { Value = pair.Key, Text = pair.Value });
            return htmlHelper.DropDownListFor(expression, list);
        }

        /// <summary>
        /// return the items of enum paired with its descrtioption.
        /// </summary>
        /// <param name="enumeration">enumeration type to be processed.</param>
        /// <returns></returns>
        public static Dictionary<string, string> GetDescription(this Type enumeration)
        {
            if (!enumeration.IsEnum)
            {
                throw new ArgumentException("passed type must be of Enum type", "enumerationValue");
            }

            Dictionary<string, string> descriptions = new Dictionary<string, string>();
            var members = enumeration.GetMembers().Where(m => m.MemberType == MemberTypes.Field);

            foreach (MemberInfo member in members)
            {
                var attrs = member.GetCustomAttributes(typeof(DescriptionAttribute), false);
                if (attrs.Count() != 0)
                    descriptions.Add(member.Name, ((DescriptionAttribute)attrs[0]).Description);
            }
            return descriptions;
        }

    }

然而，即使这适用于我，这不是我在问的。相反，我需要以下工作：

However, even though this worked for me, it is not what I'm asking. Instead, I need the following to work:

代码 Shared\EditorTemplates\Enum.acsx ：

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Enum>" %>
<%@ Import Namespace="System.Web.Mvc.Html" %>
<%@ Import Namespace="WhereMyExtentionMethod" %>
<%=Html.DropDownListFor(m => m.GetType().Name, Model.GetType()) %>

为此，我不必为每个枚举创建一个模板。

With this I wouldn't have to make a template for every enum any more.

推荐答案

谢谢大家的贡献
Yngvebn，我曾经尝试过你的解决方案（在你的最后一个评论），但是我唯一没有做的是< dynamic> ，我用通用的<枚举> 键入。

Thank you all for your contributions
Yngvebn, i tried your solution (in your last comment) before, but the only thing i didn't do is the <dynamic>, i used instead <Enum> in generic type.

最后解决方案是：_
创建一个名为Enum.acsx的模板，并将其放在 Views \Shared \EditorTemplates

at last the solution is :
create a template named Enum.acsx and put it under the Views\Shared\EditorTemplates

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<dynamic>" %>
<%@ Import Namespace="System.Web.Mvc.Html" %>
<%@ Import Namespace="the extension methods namespace" %>
<% Enum model = (Enum)Model; %>
<%=Html.DropDownList(model.GetType().Name,model.GetType())%>

和您的实体：

public class Person
{
  [UIHint("Enum")]
  public GenderEnum Gender{get;set;}
}

public Enum GenderEnum
{
 [Description("Male Person")]
 Male,
 [Description("Female Person")]
 Female
}

再次有扩展方法：

public static class HtmlHelperExtension
    {
        public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, Type enumType)
        {
            List<SelectListItem> list = new List<SelectListItem>();
            Dictionary<string, string> enumItems = enumType.GetDescription();
            foreach (KeyValuePair<string, string> pair in enumItems)
                list.Add(new SelectListItem() { Value = pair.Key, Text = pair.Value });
            return htmlHelper.DropDownListFor(expression, list);
        }

        /// <summary>
        /// return the items of enum paired with its descrtioption.
        /// </summary>
        /// <param name="enumeration">enumeration type to be processed.</param>
        /// <returns></returns>
        public static Dictionary<string, string> GetDescription(this Type enumeration)
        {
            if (!enumeration.IsEnum)
            {
                throw new ArgumentException("passed type must be of Enum type", "enumerationValue");
            }

            Dictionary<string, string> descriptions = new Dictionary<string, string>();
            var members = enumeration.GetMembers().Where(m => m.MemberType == MemberTypes.Field);

            foreach (MemberInfo member in members)
            {
                var attrs = member.GetCustomAttributes(typeof(DescriptionAttribute), false);
                if (attrs.Count() != 0)
                    descriptions.Add(member.Name, ((DescriptionAttribute)attrs[0]).Description);
            }
            return descriptions;
        }

    }

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