using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
namespace CSharpUtilHelpV2
{
/// <summary>
/// 基于.NET 2.0的枚举工具类
/// </summary>
public static class EnumToolV2
{
/// <summary>
/// 从枚举中获取Description
/// 说明：
/// 单元测试-->通过
/// </summary>
/// <param name="enumName">需要获取枚举描述的枚举</param>
/// <returns>描述内容</returns>
public static string 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>
/// 获取字段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>
/// 根据Description获取枚举
/// 说明：
/// 单元测试-->通过
/// </summary>
/// <typeparam name="T">枚举类型</typeparam>
/// <param name="description">枚举描述</param>
/// <returns>枚举</returns>
public static T GetEnumName<T>(string description)
{
Type _type = typeof(T);
foreach (FieldInfo 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} 未能找到对应的枚举.", description), "Description");
}
/// <summary>
/// 将枚举转换为ArrayList
/// 说明：
/// 若不是枚举类型，则返回NULL
/// 单元测试-->通过
/// </summary>
/// <param name="type">枚举类型</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;
}
}
}
单元测试代码：
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections;
using System.Collections.Generic;
namespace CSharpUtilHelpV2.Test
{
public enum TestEnum
{
[System.ComponentModel.Description("第一")]
One,
[System.ComponentModel.Description("第二")]
Two,
[System.ComponentModel.Description("第三")]
Three,
[System.ComponentModel.Description("第五")]
Five,
[System.ComponentModel.Description("全部")]
All
}
[TestClass()]
public class EnumToolV2Test
{
[TestMethod()]
public void GetDescriptionTest()
{
string _actual = TestEnum.Five.GetDescription();
string _expected = "第五";
Assert.AreEqual(_expected, _actual);
}
[TestMethod()]
public void GetEnumNameTest()
{
TestEnum _actual = EnumToolV2.GetEnumName<TestEnum>("第五");
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, "第一"));
_expected.Add(new KeyValuePair<Enum, string>(TestEnum.Two, "第二"));
_expected.Add(new KeyValuePair<Enum, string>(TestEnum.Three, "第三"));
_expected.Add(new KeyValuePair<Enum, string>(TestEnum.Five, "第五"));
_expected.Add(new KeyValuePair<Enum, string>(TestEnum.All, "全部"));
CollectionAssert.AreEqual(_expected, _actual);
}
}
}
