[Reprint] [C #] enumeration operation (obtain Description from enumeration, obtain enumeration Based on Description, and convert enumeration to ArrayList) tool class,

[Reprint] [C #] enumeration operation (obtain Description from enumeration, obtain enumeration Based on Description, and convert enumeration to ArrayList) tool class,

Key code:

Using System; using System. collections; using System. collections. generic; using System. componentModel; using System. reflection; namespace CSharpUtilHelpV2 {/// <summary> /// based on. NET 2.0 Enumeration Tool class /// </summary> public static class EnumToolV2 {// <summary> /// obtain the Description from the enumeration /// Description: /// unit test --> pass /// </summary> /// <param name = "enumName"> obtain enumeration descriptions </param> /// <returns> description </returns> public static strin G GetDescription (this Enum enumName) {string _ description = string. empty; FieldInfo _ fieldInfo = enumName. getType (). getField (enumName. toString (); DescriptionAttribute [] _ attributes = _ fieldInfo. getDescriptAttr (); if (_ attributes! = Null & _ attributes. length> 0) _ description = _ attributes [0]. description; else _ description = enumName. toString (); return _ description ;} /// <summary> /// obtain the field Description /// </summary> /// <param name = "fieldInfo"> FieldInfo </param> /// <returns> DescriptionAttribute [] </returns> public static DescriptionAttribute [] GetDescriptAttr (this FieldInfo fieldInfo) {if (fieldInfo! = Null) {return (DescriptionAttribute []) fieldInfo. getCustomAttributes (typeof (DescriptionAttribute), false);} return null ;}/// <summary> /// obtain the enumeration according to Description /// Description: /// unit test --> pass /// </summary> /// <typeparam name = "T"> Enumeration type </typeparam> /// <param name =" description "> enumeration description </param> // <returns> enumeration </returns> public static T GetEnumName <T> (string description) {Type _ type = typeof (T); foreach (FieldI Nfo field in _ type. GetFields () {DescriptionAttribute [] _ curDesc = field. GetDescriptAttr (); if (_ curDesc! = Null & _ curDesc. length> 0) {if (_ curDesc [0]. description = description) return (T) field. getValue (null);} else {if (field. name = description) return (T) field. getValue (null) ;}throw new ArgumentException (string. format ("{0} cannot find the corresponding enumeration. ", description)," Description ") ;}/// <summary> /// convert enumeration to ArrayList /// description: /// if it is not an enumeration type, NULL // unit test --> pass /// </summary> /// <param name = "type"> Enumeration type </param> /// <returns> ArrayList </returns> public static ArrayList ToArrayList (this Type type) {if (type. isEnum) {ArrayList _ array = new ArrayList (); Array _ enumValues = Enum. getValues (type); foreach (Enum value in _ enumValues) {_ array. add (new KeyValuePair <Enum, string> (value, GetDescription (value);} return _ array;} return null ;}}}

Unit test code:

Using Microsoft. visual Studio. testTools. unitTesting; using System. collections; using System. collections. generic; namespace CSharpUtilHelpV2.Test {public enum TestEnum {[System. componentModel. description ("first")] One, [System. componentModel. description ("second")] Two, [System. componentModel. description ("third")] Three, [System. componentModel. description ("Fifth")] Five, [System. componentModel. description ("All")] All} [TestClass ()] public class EnumToolV2Test {[TestMethod ()] public void GetDescriptionTest () {string _ actual = TestEnum. five. getDescription (); string _ expected = "Fifth"; Assert. areEqual (_ expected, _ actual);} [TestMethod ()] public void GetEnumNameTest () {TestEnum _ actual = EnumToolV2.GetEnumName <TestEnum> ("Fifth "); testEnum _ expected = TestEnum. five; Assert. areEqual <TestEnum> (_ expected, _ actual);} [TestMethod ()] public void ToArrayListTest () {ArrayList _ actual = EnumToolV2.ToArrayList (typeof (TestEnum )); arrayList _ expected = new ArrayList (5); _ expected. add (new KeyValuePair <Enum, string> (TestEnum. one, "first"); _ expected. add (new KeyValuePair <Enum, string> (TestEnum. two, "second"); _ expected. add (new KeyValuePair <Enum, string> (TestEnum. three, "third"); _ expected. add (new KeyValuePair <Enum, string> (TestEnum. five, "Fifth"); _ expected. add (new KeyValuePair <Enum, string> (TestEnum. all, "All"); CollectionAssert. areEqual (_ expected, _ actual) ;}} unit test results: