[C #] EnumHelper,

[C #] EnumHelper,

Using System; using System. componentModel; using System. reflection; namespace LH. dotNet2.Utilities. common {// <summary> /// enumeration help class /// </summary> public static class EnumHelper {# region private method private static DescriptionAttribute [] GetDescriptAttr (this FieldInfo fieldInfo) {if (fieldInfo! = Null) {return (DescriptionAttribute []) fieldInfo. getCustomAttributes (typeof (DescriptionAttribute), false);} return null ;} # endregion private method /// <summary> /// determines whether the enumeration includes the enumerated constant name /// </summary> /// <typeparam name = "T"> enumeration </typeparam> // <param name = "enumName"> enumeration constant name </param> // <returns> whether the enumerated constant name is included </returns> // create persons: yan Zhiwei // Creation Time: // remarks: <c> null </c> public static bool CheckedContainEnum Name <T> (string enumName) where T: struct, IConvertible {bool _ result = false; if (typeof (T ). isEnum) {string [] _ enumnName = Enum. getNames (typeof (T); if (_ enumnName! = Null) {for (int I = 0; I <_ enumnName. length; I ++) {if (string. compare (_ enumnName [I], enumName, true) = 0) {_ result = true; break ;}}} return _ result ;} /// <summary> /// obtain the Description from the enumeration /// </summary> /// <param name = "targetEnum"> obtain the enumeration Description </ param> // <returns> description </returns> public static string GetDescription (this Enum targetEnum) {string _ description = string. empty; FieldInfo _ fie LdInfo = targetEnum. GetType (). GetField (targetEnum. ToString (); DescriptionAttribute [] _ attributes = _ fieldInfo. GetDescriptAttr (); if (_ attributes! = Null & _ attributes. length> 0) _ description = _ attributes [0]. description; else _ description = targetEnum. toString (); return _ description ;} /// <summary> /// obtain enumeration Based on Description /// </summary> /// <typeparam name = "T"> Enumeration type </typeparam> /// <param name = "description"> enumeration description </param> // <returns> enumeration </returns> public static T ParseEnumDescription <T> (this string description, T defaultValue) where T: struct, IConvertible {if (typeof (T ). isEnum) {Type _ type = typeof (T); foreach (FieldInfo field in _ type. getFields () {DescriptionAttribute [] _ description = field. getDescriptAttr (); if (_ description! = Null & _ description. length> 0) {if (string. compare (_ description [0]. description, description, true) = 0) {defaultValue = (T) field. getValue (null); break;} else {if (string. compare (field. name, description, true) = 0) {defaultValue = (T) field. getValue (null); break ;}}} return defaultValue ;} /// <summary> /// convert the enumerated constant name to an enumeration // </summary> /// <typeparam name = "T"> enumeration </typeparam>/ // <param name = "enumName"> enumeration constant name </param> // <returns> </returns> // Creator: yan Zhiwei // Creation Time: // remarks: <c> null </c> public static T ParseEnumName <T> (this string enumName) where T: struct, IConvertible {return (T) Enum. parse (typeof (T), enumName, true );}}}

Unit test:

using Microsoft.VisualStudio.TestTools.UnitTesting;namespace YanZhiwei.DotNet2.Utilities.Common.Tests{    public enum AreaMode    {        NONE,        CITY,        TOWN,        ROAD,        CITYTOWN,        TOWNROAD,        CITYROAD,        ALL    }    [TestClass()]    public class EnumHelperTests    {        [TestMethod()]        public void CheckedContainEnumNameTest()        {            Assert.IsTrue(EnumHelper.CheckedContainEnumName<AreaMode>("none"));        }        [TestMethod()]        public void GetDescriptionTest()        {            Assert.AreEqual("NONE", AreaMode.NONE.GetDescription());        }        [TestMethod()]        public void ParseEnumDescriptionTest()        {            Assert.AreEqual(AreaMode.NONE, EnumHelper.ParseEnumDescription<AreaMode>("NONE", AreaMode.CITYTOWN));        }        [TestMethod()]        public void ParseEnumNameTest()        {            Assert.AreEqual(AreaMode.ALL, EnumHelper.ParseEnumName<AreaMode>("ALL"));        }    }}