[C#] Enum 的 String 值

MVA Twenty C# Questions Explained - [15 How do I get the String Value of an enum ?]

影片內用 Enum.GetName() 和 ToString() 兩種方法取出 Enum String 值

MVA 範例

class Program
{
    static void Main(string[] args)
    {
        // Enum.GetName()   
        AuthMethod auth = AuthMethod.FORMS;
        string str1 = Enum.GetName(typeof(AuthMethod), auth);
        Console.WriteLine(str1);
        
        // ToString()
        string str2 = AuthMethod.WINDOWSAUTHENTICATION.ToString();
        Console.WriteLine(str2);
    }

    public enum AuthMethod
    {
        FORMS = 1,
        WINDOWSAUTHENTICATION = 2,
        SINGLESIGNON = 3
    }
}

練習時發現原來 enum string 中，不能有空白，搜尋些資料才發現 enum 可以設定 Description

using System.ComponentModel;
using System.Reflection;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {

            foreach (enumProductions Production in Enum.GetValues(typeof(enumProductions)))
            {
                FieldInfo fi = Production.GetType().GetField(Production.ToString());
                if (fi == null) return;
                object[] attrs = fi.GetCustomAttributes(typeof(DescriptionAttribute),true);
                if (attrs != null && attrs.Length > 0) Console.WriteLine(((DescriptionAttribute)attrs[0]).Description);
            }
        }

        enum enumProductions
        {
            [Description("SQL Server")]
            SQLServer = 1 ,
            [Description("Visual Studio")]
            VisualStudio = 2 ,
            [Description("Windows Server")]
            WindowsServer = 3
        }
    }
}

參考資料
• Twenty C# Questions Explained
• Enum.GetName() 、Enum.GetValues()
• Adding Descriptions to your Enumerations
• Associating Strings with enums in C#