枚举特性标记和基本处理类及应用

/// <summary> /// 错误码枚举 /// </summary> public enum CodeEnum : int { 解析报文出错 = 10000, 数据包为空 = 10001, 参数无效 = 10002, 执行失败 = 10003, 调用接口校验不成功 = 10004, 应用内部错误 = 10005 }

using Newtonsoft.Json; using System; namespace Business { [JsonObject] public class ExceptionBiz : Exception { public ExceptionBiz(CodeEnum code, string msg) { Code = code; Msg = msg; LogManage.Add(StackTrace+ msg);//记录日志 } /// <summary> /// 业务信息编码 /// </summary> public CodeEnum Code { get; set; } /// <summary> /// 业务信息消息 /// </summary> public string Msg { get; set; } } }

public static void Add(string content) { string logPath = GetApp("LogPath"); if (logPath == "") logPath = @"G:log"; //string dirPath = Directory.GetCurrentDirectory() + logPath; if (!Directory.Exists(logPath)) { Directory.CreateDirectory(logPath); } string fileName = DateTime.Now.ToString("yyyyMMdd")+".txt"; using (FileStream fs = new System.IO.FileStream(logPath + fileName, System.IO.FileMode.Append)) { using (StreamWriter sw = new StreamWriter(fs)) { sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")+":"+ content); } } }

using System; using System.Collections.Generic; using System.Reflection; namespace Business { public class EnumHelper { /// <summary> /// 用于缓存枚举值的属性值 /// </summary> private static readonly Dictionary<object, EnumAttribute> enumAttr = new Dictionary<object, EnumAttribute>(); /// <summary> /// 获取枚举值的名称，该名称由EnumAttribute定义 /// </summary> /// <param name="value">枚举值</param> /// <returns>枚举值对应的名称</returns> public static string GetName(Enum value) { EnumAttribute ea = GetAttribute(value); return ea != null ? ea.Name : ""; } /// <summary> /// 获取枚举值的名称，该名称由EnumAttribute定义 /// </summary> /// <param name="value">枚举值</param> /// <returns>枚举值对应的名称</returns> public static string GetDescription(Enum value) { EnumAttribute ea = GetAttribute(value); return ea != null ? ea.Description : ""; } /// <summary> /// 从字符串转换为枚举类型 /// </summary> /// <typeparam name="T">枚举类型</typeparam> /// <param name="str">要转为枚举的字符串</param> /// <returns>转换结果</returns> public static T GetEnum<T>(string str) { if (string.IsNullOrWhiteSpace(str)) throw new ExceptionBiz(CodeEnum.解析报文出错, "排序对象解析出错！"); try { T pe = (T)Enum.Parse(typeof(T), str); return pe; } catch { Type type = typeof(T); string templete = "枚举类型{0}中没有定义{1}项！"; string msg = string.Format(templete, type.ToString(), str); throw new ExceptionBiz(CodeEnum.解析报文出错, msg); } } /// <summary> /// 获取枚举值定义的属性 /// </summary> /// <param name="value">枚举对象</param> /// <returns>获取枚举对象的描述属性值</returns> private static EnumAttribute GetAttribute(Enum value) { if (enumAttr.ContainsKey(value)) { EnumAttribute ea = enumAttr[value]; return ea; } else { FieldInfo field = value.GetType().GetField(value.ToString()); if (field == null) return null; EnumAttribute ea = null; object[] attributes = field.GetCustomAttributes(typeof(EnumAttribute), true); if (attributes != null && attributes.Length > 0) { ea = (EnumAttribute)attributes[0]; } enumAttr[value] = ea; return ea; } } } /// <summary> ///描述枚举的属性 /// </summary> [AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = true)] public class EnumAttribute : Attribute { private string _name; private string _description; /// <summary> /// 枚举名称 /// </summary> public string Name { get { return _name; } set { _name = value; } } /// <summary> /// 枚举描述 /// </summary> public string Description { get { return _description; } set { _description = value; } } /// <summary> /// 构造函数 /// </summary> /// <param name="name">枚举名称</param> public EnumAttribute(string name) { this.Name = name; } /// <summary> /// 构造函数 /// </summary> /// <param name="name">枚举名称</param> /// <param name="description">枚举描述</param> public EnumAttribute(string name, string description) { this.Name = name; this.Description = description; } } }

ProductEnum pe = EnumHelper.GetEnum<ProductEnum>(v.Name); //名称获取枚举对象 string name = EnumHelper.GetName(pe); //获取枚举对象的描述 if (string.IsNullOrWhiteSpace(name)) throw new ExceptionBiz(CodeEnum.解析报文出错, "排序对象映射出错！");

/// <summary> /// 商品排序枚举 /// </summary> public enum ProductEnum { [EnumAttribute("sales")]销量, [EnumAttribute("mprice3")]价格, [EnumAttribute("comments")]评论, [EnumAttribute("id")]最新 }