‫آشنایی با مفاهیم نوع داده Enum و توسعه آن - قسمت دوم

class Description : Attribute
{
    public string Text;
    public Description(string text)
    {
        Text = text;
    }
}

public enum Grade
{
    [Description("Mardood")]
    Failing = 5,

    [Description("Ajab Shansi")]
    BelowAverage = 10,

    [Description("Bad Nabood")]
    Average = BelowAverage + 5,

    [Description("Khoob Bood")]
    VeryGood = 18,

    [Description("Gol Kashti")]
    Excellent = 20
}

public static class ExtensionMethodCls
{
    public static string GetDescription(this Enum enu)
    {

        Type type = enu.GetType();

        MemberInfo[] memInfo = type.GetMember(enu.ToString());

        if (memInfo != null && memInfo.Length > 0)
        {

            object[] attrs = memInfo[0].GetCustomAttributes(typeof(Description), false);

            if (attrs != null && attrs.Length > 0)
                return ((Description)attrs[0]).Text;
        }

        return enu.ToString();
    }
}

Console.WriteLine(grade.GetDescription());  // Print Bad Nabood

using System;
using System.Reflection;

namespace CSharpEnum
{

    class Description : Attribute
    {
        public string Text;
        public Description(string text)
        {
            Text = text;
        }
    }

    public enum Grade
    {
        [Description("Mardood")]
        Failing = 5,

        [Description("Ajab Shansi")]
        BelowAverage = 10,

        [Description("Bad Nabood")]
        Average = BelowAverage + 5,

        [Description("Khoob Bood")]
        VeryGood = 18,

        [Description("Gol Kashti")]
        Excellent = 20
    }

    public static class ExtensionMethodCls
    {
        public static string GetDescription(this Enum enu)
        {

            Type type = enu.GetType();

            MemberInfo[] memInfo = type.GetMember(enu.ToString());

            if (memInfo != null && memInfo.Length > 0)
            {

                object[] attrs = memInfo[0].GetCustomAttributes(typeof(Description), false);

                if (attrs != null && attrs.Length > 0)
                    return ((Description)attrs[0]).Text;
            }

            return enu.ToString();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            const Grade grade = Grade.Average;
            Console.WriteLine("Underlying type: {0}", Enum.GetUnderlyingType(grade.GetType()));
            Console.WriteLine("Type Code      : {0}", grade.GetTypeCode());
            Console.WriteLine("Value          : {0}", (int)grade);
            Console.WriteLine("--------------------------------------");
            Console.WriteLine(grade.ToString()); // name of the constant
            Console.WriteLine(grade.ToString("G")); // name of the constant
            Console.WriteLine(grade.ToString("F")); // name of the constant
            Console.WriteLine(grade.ToString("x")); // value is hex
            Console.WriteLine(grade.ToString("D")); // value in decimal
            Console.WriteLine("--------------------------------------");
            Console.WriteLine(grade.GetDescription());  // Print Bad Nabood
            Console.ReadKey();
        }
    }
}