using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.ComponentModel.DataAnnotations;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace CommonHelper
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{
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/// <summary>
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/// 对应表的字段名称
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/// </summary>
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public class EnumColnameAttribute : Attribute
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{
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public EnumColnameAttribute(string colname)
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{
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ColName = colname;
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}
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public string ColName { get; set; }
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}
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/// <summary>
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/// 保留几位小数
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/// </summary>
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public class EnumDecimalDigitsAttribute : Attribute
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{
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public EnumDecimalDigitsAttribute(int digits)
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{
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Digits = digits;
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}
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public int Digits;
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}
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/// <summary>
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/// 枚举类型操作公共类。
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/// </summary>
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public static class EnumHelper
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{
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/// <summary>
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/// 获取枚举所有成员名称。
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/// </summary>
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/// <typeparam name="T">枚举类型</typeparam>
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public static string[] GetNames<T>()
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{
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return Enum.GetNames(typeof(T));
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}
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/// <summary>
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/// 检测枚举是否包含指定成员。
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/// </summary>
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/// <typeparam name="T">枚举类型</typeparam>
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/// <param name="member">成员名或成员值</param>
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public static bool IsDefined(this Enum value)
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{
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Type type = value.GetType();
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return Enum.IsDefined(type, value);
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}
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/// <summary>
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/// 返回指定枚举类型的指定值的描述。
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/// </summary>
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/// <param name="t">枚举类型</param>
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/// <param name="v">枚举值</param>
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/// <returns></returns>
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public static string GetDescription(this Enum value)
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{
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try
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{
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Type type = value.GetType();
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FieldInfo field = type.GetField(value.ToString());
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DescriptionAttribute[] attributes = (DescriptionAttribute[])field.GetCustomAttributes(typeof(DescriptionAttribute), false);
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return (attributes.Length > 0) ? attributes[0].Description : string.Empty;
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}
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catch
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{
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return string.Empty;
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}
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}
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public static string GetDisplayName(this Enum eum)
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{
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var type = eum.GetType();//先获取这个枚举的类型
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var field = type.GetField(eum.ToString());//通过这个类型获取到值
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var obj = (DisplayAttribute)field.GetCustomAttribute(typeof(DisplayAttribute));//得到特性
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return obj.Name ?? "";
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}
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/// <summary>
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/// 返回指定枚举类型的指定值 对应的列名。
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/// </summary>
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/// <param name="t"></param>
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/// <returns></returns>
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public static string GetColName(this Enum t)
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{
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var t_type = t.GetType();
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var fieldName = Enum.GetName(t_type, t);
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var attributes = t_type.GetField(fieldName).GetCustomAttributes(false);
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var enumDisplayAttribute = attributes.FirstOrDefault(p => p.GetType().Equals(typeof(EnumColnameAttribute))) as EnumColnameAttribute;
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return enumDisplayAttribute == null ? fieldName : enumDisplayAttribute.ColName;
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}
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/// <summary>
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/// 返回指定枚举类型的指定值 对应的列名。
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/// </summary>
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/// <param name="t"></param>
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/// <returns></returns>
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public static int GetDecimalDigits(this Enum t)
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{
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var t_type = t.GetType();
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var fieldName = Enum.GetName(t_type, t);
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var attributes = t_type.GetField(fieldName).GetCustomAttributes(false);
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var enumDisplayAttribute = attributes.FirstOrDefault(p => p.GetType().Equals(typeof(EnumDecimalDigitsAttribute))) as EnumDecimalDigitsAttribute;
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return enumDisplayAttribute?.Digits ?? 0;
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}
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/// <summary>
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/// 将枚举转换成字典集合
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/// </summary>
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/// <typeparam name="T">枚举类型</typeparam>
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/// <returns></returns>
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public static Dictionary<int,string> Enum2Dict<T>()
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{
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Dictionary<int, string> resultList = new Dictionary<int, string>();
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Type type = typeof(T);
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var strList = GetNames<T>().ToList();
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foreach (string key in strList)
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{
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string val = Enum.Format(type, Enum.Parse(type, key), "d");
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resultList.Add( int.Parse(val), key);
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}
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return resultList;
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}
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/// <summary>
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/// 将枚举转换成字典集合
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/// </summary>
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/// <typeparam name="T">枚举类型</typeparam>
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/// <returns></returns>
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public static Dictionary<int, string> EnumDescription2Dict<T>()
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{
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Dictionary<int, string> resultList = new Dictionary<int, string>();
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Type type = typeof(T);
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var strList = GetNames<T>().ToList();
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foreach (string key in strList)
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{
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var e = (Enum)Enum.Parse(type, key);
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string val = Enum.Format(type, Enum.Parse(type, key), "d");
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resultList.Add(int.Parse(val), e.GetDescription());
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}
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return resultList;
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}
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}
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}
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