如何找到相应的值的枚举名称，并在DisplayFor使用它？ [英] How find the enum name for corresponding value and use it in DisplayFor?

问题描述

我需要为内部DisplayFor的HtmlHelper相应值显示枚举的名称。我有以下枚举：

I need to display the name of the enum for corresponding value inside DisplayFor HtmlHelper. I have the following enum:

public enum CheckStatus
    {
        Yes = 1,
        No = 2,
        Maybe =3
    }

我的模型通常显示的值是这样的：

I'm displaying values for a model normally like this:

@Html.DisplayFor(modelItem => item.Name)

问题是，在一个点上我有这样的：

The problem is that at one point I have this:

@Html.DisplayFor(modelItem => item.Status)

这行只显示这是从枚举之前设置状态值（1,2或3）。相反的，我需要以某种方式该值显示名称。所以，如果状态code是2，我想显示否，而不是2号。

That line displays only status value which is set before from enum (1,2 or 3). Instead of that I need somehow to display name for that value. So, if status code is 2, I want to display 'No', not number 2.

我有类似的问题，得到枚举的名字时，我填充下拉列表，我设法解决这个问题是这样的：

I had the similar problem with getting enum names when I was populating dropdown list and I managed to solve it like this:

@Html.DropDownListFor(model => model.Item.Status,
                new SelectList(Enum.GetValues(typeof(Pro.Web.Models.Enums.CheckStatus))))

我是如何从枚举值只得到一个名字一点点丧失。

I am a little bit lost in how to get only that one name from the value of the enum.

感谢您的帮助。

推荐答案

这不是从你的问题有什么基本类型状态属性非常清晰。如果是的checkStatus ，那么 @ Html.DisplayFor（modelItem =＆GT; item.Status）将显示正是你期望。如果在另一方面，它是一个整数，你可以写一个自定义的助手来显示正确的值：

It's not very clear from your question what's the underlying type of the Status property. If it is CheckStatus, then @Html.DisplayFor(modelItem => item.Status) will display exactly what you expect. If on the other hand it is an integer you could write a custom helper to display the proper value:

public static class HtmlExtensions
{
    public static IHtmlString DisplayEnumFor<TModel>(this HtmlHelper<TModel> html, Expression<Func<TModel, int>> ex, Type enumType)
    {
        var value = (int)ModelMetadata.FromLambdaExpression(ex, html.ViewData).Model;
        string enumValue = Enum.GetName(enumType, value);
        return new HtmlString(html.Encode(enumValue));
    }
}

，然后用它是这样的：

and then use it like this:

@Html.DisplayEnumFor(modelItem => item.Status, typeof(CheckStatus))

让我们假设你希望把这个帮助了一步，考虑到您的枚举类型的显示名称属性：

and let's suppose that you wanted to bring this helper a step further and take into account the DisplayName attribute on your enum type:

public enum CheckStatus
{
    [Display(Name = "oh yeah")]
    Yes = 1,
    [Display(Name = "no, no, no...")]
    No = 2,
    [Display(Name = "well, dunno")]
    Maybe = 3
}

下面是如何可以扩展我们的自定义帮助：

Here's how you could extend our custom helper:

public static class HtmlExtensions
{
    public static IHtmlString DisplayEnumFor<TModel>(this HtmlHelper<TModel> html, Expression<Func<TModel, int>> ex, Type enumType)
    {
        var value = (int)ModelMetadata.FromLambdaExpression(ex, html.ViewData).Model;
        string enumValue = Enum.GetName(enumType, value);
        var field = enumType.GetField(enumValue);
        if (field != null)
        {
            var displayAttribute = field
                .GetCustomAttributes(typeof(DisplayAttribute), false)
                .Cast<DisplayAttribute>()
                .FirstOrDefault();
            if (displayAttribute != null)
            {
                return new HtmlString(html.Encode(displayAttribute.Name));
            }
        }
        return new HtmlString(html.Encode(enumValue));
    }
}

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