如何将枚举转换为显示名称和值到 json

Question

    public static class HtmlEnumExtensions
    {
        public static MvcHtmlString EnumToString<T>(this HtmlHelper helper)
        {
            var values = Enum.GetValues(typeof(T)).Cast<int>();
            var enumDictionary = values.ToDictionary(value => Enum.GetName(typeof(T), value));

            return new MvcHtmlString(JsonConvert.SerializeObject(enumDictionary));
        }
    }
 <script>
     var assetStatusEnum = @(Html.EnumToString<AssetStatusEnum>())
     var assetStatusEnum ={"Free":0,"Reserved":1,"Inactive":2,"UnderMaintenance":3}
    </script>
public enum ProjectState
    {
        [Display(Name = "bianji")]
        Wait = 0,
        [Display(Name = "tongguo")]
        Pass = 1,
        [Display(Name = "jujue")]
        Reject = 2,
        [Display(Name = "shangchu")]
        Deleted = 3
    }

这是 HtmlHelper 的扩展方法，如何获取枚举自定义属性显示名称和值 var assetStatusEnum = [{"name":"bianji","value":"0"},{"name":"tongguo","value":"1"}...] 如何修改 HtmlHelper 的扩展方法来实现我想要的？我想实现 EnumToString 重载来接受一个 displyname 参数和返回值。

Answer 1

尝试使用.Select 谓词将values 展平，如下所示，

var enumDictionary = Enum.GetValues(typeof(T))
    .Cast<T>()
    .Select(x => new
    {
        name = x,
        value = Convert.ToInt32(Enum.Parse(typeof(T), x.ToString()))
    })
    .ToList();

如果您想在Display 属性中获取名称，那么您可以在下面使用，

var enumDictionary = Enum.GetValues(typeof(T))
    .Cast<T>()
    .Select(x => new
    {
        name = x.GetType().GetMember(x.ToString()).FirstOrDefault().GetCustomAttribute<DisplayAttribute>().GetName(),
        value = Convert.ToInt32(Enum.Parse(typeof(T), x.ToString()))
    })
    .ToList();

注意：您需要将一些命名空间导入到您的程序中，例如

using System.ComponentModel.DataAnnotations;
using System.Reflection;