questions/47893236/how-to-get-an-ienumerablestring-of-enum-values-attributes

CSharp · Console

/Program.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization.Formatters;
using System.IO;
using System.Data;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Reflection;

// https://stackoverflow.com/questions/47893236/how-to-get-an-ienumerablestring-of-enum-values-attributes

    public class StringValueAttribute : Attribute
    {
        public string Value { get; private set; }

        public StringValueAttribute(string value)
        {
            Value = value;
        }
    }

    enum Group
    {
        [StringValue("Computer Science")]
        ComputerScience,

        [StringValue("Software Engineering")]
        SoftwareEngineering,

    }

    public static class EnumExtensions
    {
        public static IEnumerable<string> GetStringValues<TEnum>() where TEnum : struct, IConvertible, IComparable, IFormattable
        {
            return Enum.GetValues(typeof(TEnum))
                .Cast<Enum>()
                .Select(e => e.GetStringValue())
                .ToList();
        }

        public static IEnumerable<string> GetStringValuesOfType(Enum value)
        {
            return Enum.GetValues(value.GetType())
                .Cast<Enum>()
                .Select(e => e.GetStringValue())
                .ToList();
        }
		
        public static string GetStringValue(this Enum value)
        {
            Type type = value.GetType();
            FieldInfo fieldInfo = type.GetField(value.ToString());
            StringValueAttribute[] attributes = fieldInfo.GetCustomAttributes(typeof(StringValueAttribute), false) as StringValueAttribute[];

            string stringValue = null;
            if (attributes.Length > 0)
            {
                stringValue = attributes[0].Value;
            }

            return stringValue;
        }
    }

    class TestClass
    {
        public static void Test()
        {
			var values = EnumExtensions.GetStringValues<Group>();
			values.Dump();
		}
	}


	public class Program
	{
		public static void Main()
		{
			Console.WriteLine("Environment version: " + Environment.Version);
			Console.WriteLine();

			try
			{
				TestClass.Test();
			}
			catch (Exception ex)
			{
				Console.WriteLine("Failed with unhandled exception: ");
				Console.WriteLine(ex);
				throw;
			}
		}
	}

    public class AssertionFailedException : System.Exception
    {
        public AssertionFailedException() : base() { }

        public AssertionFailedException(string s) : base(s) { }
    }

    public static class Assert
    {
        public static void IsTrue(bool value)
        {
            IsTrue(value, "failed");
        }

        public static void IsTrue(bool value, string message)
        {
            if (value == false)
                throw new AssertionFailedException(message ?? "failed");
        }
    }