c#枚举 获取枚举键值对、描述等

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Dictionary<string, string> dic1 = GetEnumItemDesc(typeof(Days));

foreach (string key in dic1.Keys)
{
Console.WriteLine(key + ":{0}", dic1[key]);
}

Dictionary<string, string> dic = GetEnumItemValueDesc(typeof(Days));
foreach (string key in dic.Keys)
{
Console.WriteLine(key + ":{0}", dic[key]);
}

Console.WriteLine(string.Format(Days.Sunday.ToString() + ":{0}", GetEnumDesc(Days.Sunday)));
Console.WriteLine(string.Format("{0}", (int)Enum.Parse(typeof(Days), "Thursday", true)));
Console.ReadKey();
}

/// <summary>
/// 获取枚举项描述信息 例如GetEnumDesc(Days.Sunday)
/// </summary>
/// <param name="en">枚举项 如Days.Sunday</param>
/// <returns></returns>
public static string GetEnumDesc(Enum en)
{
Type type = en.GetType();
MemberInfo[] memInfo = type.GetMember(en.ToString());
if (memInfo != null && memInfo.Length > 0)
{
object[] attrs = memInfo[0].GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
if (attrs != null && attrs.Length > 0)
return ((DescriptionAttribute)attrs[0]).Description;
}
return en.ToString();
}

///<summary>
/// 获取枚举项+描述
///</summary>
///<param name="enumType">Type,该参数的格式为typeof(需要读的枚举类型)</param>
///<returns>键值对</returns>
public static Dictionary<string, string> GetEnumItemDesc(Type enumType)
{
Dictionary<string, string> dic = new Dictionary<string, string>();
FieldInfo[] fieldinfos = enumType.GetFields();
foreach (FieldInfo field in fieldinfos)
{
if (field.FieldType.IsEnum)
{
Object[] objs = field.GetCustomAttributes(typeof(DescriptionAttribute), false);
dic.Add(field.Name, ((DescriptionAttribute)objs[0]).Description);
}
}
return dic;
}

///<summary>
/// 获取枚举值+描述
///</summary>
///<param name="enumType">Type,该参数的格式为typeof(需要读的枚举类型)</param>
///<returns>键值对</returns>
public static Dictionary<string, string> GetEnumItemValueDesc(Type enumType)
{
Dictionary<string, string> dic = new Dictionary<string, string>();
Type typeDescription = typeof(DescriptionAttribute);
FieldInfo[] fields = enumType.GetFields();
string strText = string.Empty;
string strValue = string.Empty;
foreach (FieldInfo field in fields)
{
if (field.FieldType.IsEnum)
{
strValue = ((int)enumType.InvokeMember(field.Name, BindingFlags.GetField, null, null, null)).ToString();
object[] arr = field.GetCustomAttributes(typeDescription, true);
if (arr.Length > 0)
{
DescriptionAttribute aa = (DescriptionAttribute)arr[0];
strText = aa.Description;
}
else
{
strText = field.Name;
}
dic.Add(strValue, strText);
}
}
return dic;
}
}

public enum Days
{
[Description("星期天")]
Sunday,
[Description("星期一")]
Monday,
[Description("星期二")]
Tuesday,
[Description("星期三")]
Wednesday,
[Description("星期四")]
Thursday,
[Description("星期五")]
Friday,
[Description("星期六")]
Saturday
}
}