Custom Attribute for Enum | C# Online Compiler

Custom Attribute for Enum by Johnny.Net

using System;
using System.Collections.Generic;
using System.Linq;

namespace HelloWorldMvcApp
{	
	public enum TaipeiDistrict : byte
	{
		[ChineseName("中正區")]
		Zhongzheng = 100,
		[ChineseName("大同區")]
		Datong = 103,
		[ChineseName("中山區")]
		Zhonesan = 104,
		[ChineseName("松山區")]
		Songshan = 105,
		[ChineseName("大安區")]
		Daan = 106,
		[ChineseName("萬華區")]
		Wanhua = 108,
		[ChineseName("信義區")]
		Xinyi = 110,
		[ChineseName("士林區")]
		Shilin = 111,
		[ChineseName("北投區")]
		Beitou = 112,
		[ChineseName("內湖區")]
		Neihu = 114,
		[ChineseName("南港區")]
		Nangang = 115,
		[ChineseName("文山區")]
		Wenshan = 116,
	}
	
	public class Util
	{
        public static IEnumerable<T> GetUnderlyingEnums<T>()
        {
            if (typeof(T).IsEnum)
                return Enum.GetValues(typeof(T)).Cast<T>();
            else return null;
        }		
	}
	
	public static class TaipeiDistrictExtensions
    {
		public static string GetChineseName(this TaipeiDistrict st)
        {
            var typ = typeof(TaipeiDistrict);
            var property = typ.GetField(st.ToString());
            var attr = (ChineseName[])property.GetCustomAttributes(typeof(ChineseName), false);
            if (0 < attr.Length)
                return attr[0].Name;
            else
                return st.ToString();
        }
    }
	
	#region Custom attributes

    [AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = false)]
    public class ChineseName : Attribute
    {
        public string Name { get; set; }

        public ChineseName(string name)
        {
            Name = name;
        }
    }

    [AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = false)]
    public class EnglishName : Attribute
    {
        public string Name { get; set; }

        public EnglishName(string name)
        {
            Name = name;
        }
    }

    #endregion
}

Model

​x
 
using System;
using System.Collections.Generic;
using System.Linq;
​
namespace HelloWorldMvcApp
{   
    public enum TaipeiDistrict : byte
    {
        [ChineseName("中正區")]
        Zhongzheng = 100,
        [ChineseName("大同區")]
        Datong = 103,
        [ChineseName("中山區")]
        Zhonesan = 104,
        [ChineseName("松山區")]
        Songshan = 105,
        [ChineseName("大安區")]
        Daan = 106,
        [ChineseName("萬華區")]
        Wanhua = 108,
        [ChineseName("信義區")]
        Xinyi = 110,
        [ChineseName("士林區")]
        Shilin = 111,
        [ChineseName("北投區")]
        Beitou = 112,
        [ChineseName("內湖區")]
        Neihu = 114,
        [ChineseName("南港區")]
        Nangang = 115,
        [ChineseName("文山區")]
        Wenshan = 116,
    }
    
    public class Util
    {
        public static IEnumerable<T> GetUnderlyingEnums<T>()
        {
            if (typeof(T).IsEnum)
                return Enum.GetValues(typeof(T)).Cast<T>();
            else return null;
        }       
    }
    
    public static class TaipeiDistrictExtensions
    {
        public static string GetChineseName(this TaipeiDistrict st)
        {
            var typ = typeof(TaipeiDistrict);
            var property = typ.GetField(st.ToString());
            var attr = (ChineseName[])property.GetCustomAttributes(typeof(ChineseName), false);
            if (0 < attr.Length)
                return attr[0].Name;
            else
                return st.ToString();
        }
    }
    
    #region Custom attributes
​
    [AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = false)]
    public class ChineseName : Attribute
    {
        public string Name { get; set; }
​
        public ChineseName(string name)
        {
            Name = name;
        }
    }
​
    [AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = false)]
    public class EnglishName : Attribute
    {
        public string Name { get; set; }
​
        public EnglishName(string name)
        {
            Name = name;
        }
    }
​
    #endregion
}

@using HelloWorldMvcApp
@{
	ViewBag.Title = "為 Enum 加上自訂 Attribute";
	Layout = null;
}

<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->

<html lang="zh-TW">
	<head>
		<meta charset="utf-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>Bootstrap 101 Template</title>

		<!-- CSS Includes -->
		<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
		
		<style type="text/css">
			body {
				font-family: 微軟正黑體, Verdana, Arial;
			}
			.field-validation-error {
				color: #ff0000;
			}

		</style>
	</head>
	
	<body>
		<div class="container">
			<div class="col-md-6 col-md-offset-3">
				<h1>@ViewBag.Title</h1>
				
				<select id="selectedDistrict">
					<option value="-1">--請選擇--</option>
					@foreach (TaipeiDistrict li in Util.GetUnderlyingEnums<TaipeiDistrict>())
					{
						<option value="@((int)li)">@li.GetChineseName()</option>
					} 
				</select>
			</div>
		</div>

		
	</body>
</html>

View

 
@using HelloWorldMvcApp
@{
    ViewBag.Title = "為 Enum 加上自訂 Attribute";
    Layout = null;
}
​
<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->
​
<html lang="zh-TW">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Bootstrap 101 Template</title>
​
        <!-- CSS Includes -->
        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
        
        <style type="text/css">
            body {
                font-family: 微軟正黑體, Verdana, Arial;
            }
            .field-validation-error {
                color: #ff0000;
            }
​
        </style>
    </head>
    
    <body>
        <div class="container">
            <div class="col-md-6 col-md-offset-3">
                <h1>@ViewBag.Title</h1>
                
                <select id="selectedDistrict">
                    <option value="-1">--請選擇--</option>
                    @foreach (TaipeiDistrict li in Util.GetUnderlyingEnums<TaipeiDistrict>())
                    {
                        <option value="@((int)li)">@li.GetChineseName()</option>
                    } 
                </select>
            </div>
        </div>
​
        
    </body>
</html>
​

using System;
using System.Web.Mvc;
using System.Collections.Generic;

namespace HelloWorldMvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			return View();
		}
	}
}

Controller

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            return View();
        }
    }
}

View in Full Screen

View IL Code