使用[显示(名称="X")]和枚举.MVC3 ASP.Net中的自定义HtmlHelper

Question

我使用另一个stackoverflow问题的代码片段:

namespace MvcHtmlHelpers
{
    public static class htmlHelpers
    {
        /// <summary>
        /// Radio button for : Adapted to support enum labels from display attributes
        /// </summary>
        /// <typeparam name="TModel"></typeparam>
        /// <typeparam name="TProperty"></typeparam>
        /// <param name="htmlHelper"></param>
        /// <param name="expression"></param>
        /// <returns></returns>
        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());
        }
    }
}

我目前的一面enum:

public enum Options
    {
       [Display(Name ="Yes")]
        0,
       [Display(Name = "No")]
        1,
      [Display(Name = "Other")]
        2,
    }

如果我然后使用@html.RadioButtonForEnum(...)它显示我的枚举与相应的框选择没有问题.但是,我希望他们使用标签值,[Display(Name = "<text>")]以便更有意义! - 即不只是0,1,2.

Answer 1

您可以使用反射来获取值:

public static MvcHtmlString RadioButtonForEnum<TModel, TProperty>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, TProperty>> expression
)
{
    var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);

    var sb = new StringBuilder();
    var enumType = metaData.ModelType;
    foreach (var field in enumType.GetFields(BindingFlags.Static | BindingFlags.GetField | BindingFlags.Public))
    {
        var value = (int)field.GetValue(null);
        var name = Enum.GetName(enumType, value);
        var label = name;
        foreach (DisplayAttribute currAttr in field.GetCustomAttributes(typeof(DisplayAttribute), true))
        {
            label = currAttr.Name;
            break;
        }

        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(label),
            radio
        );
    }
    return MvcHtmlString.Create(sb.ToString());
}