特性Atrribute和枚举

特性的简单实用！特性存放在metedata里面，它离不开反射。

Program.cs

 class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(PersonOptions.PersonOne.ToString() + " : " + PersonOptions.PersonOne.GetDescription());
            Console.WriteLine(PersonOptions.PersonTwo.ToString() + " : " + PersonOptions.PersonTwo.GetDescription());
            Console.WriteLine(PersonOptions.PersonThree.ToString() + " : " + PersonOptions.PersonThree.GetDescription());
            Console.ReadLine();
        }
    }

PersonOptions.cs

 public enum PersonOptions
    {
        [Description("张三")]
        PersonOne,
        [Description("李四")]
        PersonTwo,
        [Description("王五")]
        PersonThree
    }

DescriptionAttribute.cs

 public class DescriptionAttribute : Attribute
    {
        public string Description { get; set; }

        public DescriptionAttribute(string description)
        {
            this.Description = description;
        }
    }

EnumHelper.cs 扩展方法和反射的使用来获得Description.

    public static class EnumHelper
    {
        public static string GetDescription(this Enum option)
        {
            string description = "";
            FieldInfo fieldInfo = option.GetType().GetField(option.ToString());
            var enumOption = (DescriptionAttribute)fieldInfo.GetCustomAttribute(typeof(DescriptionAttribute));
            if (enumOption != null)
            {
                description = enumOption.Description;
            }
            return description;
        }
    }