如何使一个枚举默认编辑器模板? [英] How to make a default editor template for enums?
问题描述
我怎么能做出一个枚举默认编辑器模板?我的意思是:我可以做这样的事情:
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 -->
和把这个在EditorTemplates文件夹名下 Enum.ascx
?
And put this in the EditorTemplates folder under the name Enum.ascx
?
下面是我的问题,我试图解决方法,但它不是我所需要的。
Here's a workaround for my problem that I tried, but it's not what I need.
下面是我的枚举:
public enum GenderEnum
{
/// <summary>
/// Male
/// </summary>
[Description("Male Person")]
Male,
/// <summary>
/// Female
/// </summary>
[Description("Female Person")]
Female
}
我做了一个名为 GenderEnum.acsx
模板,并把它放在共享/ EditorTemplates
文件夹中。这里是模板:
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,该方法是我自己的:
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;
}
}
不过,即使这个工作对我来说,这不是我在问什么。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:
code为共享\\ 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()) %>
有了这个,我也不会做一个模板,每枚举了。
With this I wouldn't have to make a template for every enum any more.
推荐答案
感谢大家的贡献
Yngvebn,我以前试过您的解决方案(在你最后的评论),但我没有做的唯一的事情就是&LT;动态&GT;
,我代替&LT;&枚举GT;
中的泛型类型
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.
最后的解决办法是:
创建一个名为Enum.acsx模板,并把它在查看\\共享\\ 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())%>
和在实体:
public class Person
{
[UIHint("Enum")]
public GenderEnum Gender{get;set;}
}
public Enum GenderEnum
{
[Description("Male Person")]
Male,
[Description("Female Person")]
Female
}
和再有延伸方法:
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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