public enum EnumGender
{
None,
[System.ComponentModel.Description("男")]
Male,
[System.ComponentModel.Description("女")]
Female,
Other,
} 

public static string GetDescriptionOriginal(this Enum @this)
{
var name = @this.ToString();
var field = @this.GetType().GetField(name);
if (field == null) return name;
var att = System.Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute), false);
return att == null ? field.Name : ((DescriptionAttribute)att).Description;
}

Console.WriteLine(EnumGender.Female.GetDescriptionOriginal());
Console.WriteLine(EnumGender.Male.GetDescriptionOriginal());
Console.WriteLine(EnumGender.Other.GetDescriptionOriginal()); //输出结果： 
女 
男 
Other

[Test]
public void GetDescriptionOriginal_Test()
{
var enums = this.GetTestEnums();
Console.WriteLine(enums.Count);
TestHelper.InvokeAndWriteAll(() =>
{
System.Threading.Tasks.Parallel.For(0, 1000000, (i, obj) =>
{
foreach (var item in enums)
{
var a = item.GetDescriptionOriginal();
}
});
});
}
//输出结果：
80
TimeSpan:79,881.0000ms //共消耗了将近80秒
MemoryUsed:-1,652.7970KB
CollectionCount(0):7,990.00 //0代GC回收了7千多次，因为创建了大量的DescriptionAttribute对象 

private static Dictionary<Enum, string> _LockDictionary = new Dictionary<Enum, string>();
public static string GetDescriptionByDictionaryWithLocak(this Enum @this)
{
if (_LockDictionary.ContainsKey(@this)) return _LockDictionary[@this];
Monitor.Enter(_obj);
if (!_LockDictionary.ContainsKey(@this))
{
var value = @this.GetDescriptionOriginal();
_LockDictionary.Add(@this, value);
}
Monitor.Exit(_obj);
return _LockDictionary[@this];
} 

[Test]
public void GetDescriptionByDictionaryWithLocak_Test()
{
var enums = this.GetTestEnums();
Console.WriteLine(enums.Count)
TestHelper.InvokeAndWriteAll(() =>
{
System.Threading.Tasks.Parallel.For(0, 1000000, (i, obj) =>
{
foreach (var item in enums)
{
var a = item.GetDescriptionByDictionaryWithLocak();
}
});
});
}
//测试结果：
80
TimeSpan:1,860.0000ms
MemoryUsed:159.2422KB
CollectionCount(0):1.00 

private static Dictionary<Enum, string> _ExceptionDictionary = new Dictionary<Enum, string>();
public static string GetDescriptionByDictionaryWithException(this Enum @this)
{
try
{
return _ExceptionDictionary[@this];
}
catch (KeyNotFoundException)
{
Monitor.Enter(_obj);
if (!_ExceptionDictionary.ContainsKey(@this))
{
var value = @this.GetDescriptionOriginal();
_ExceptionDictionary.Add(@this, value);
}
Monitor.Exit(_obj);
return _ExceptionDictionary[@this];
}
}

[Test]
public void GetDescriptionByDictionaryWithException_Test()
{
var enums = this.GetTestEnums();
Console.WriteLine(enums.Count);
TestHelper.InvokeAndWriteAll(() =>
{
System.Threading.Tasks.Parallel.For(0, 1000000, (i, obj) =>
{
foreach (var item in enums)
{
var a = item.GetDescriptionByDictionaryWithException();
}
});
});
}
//测试结果：
80
TimeSpan:1,208.0000ms
MemoryUsed:230.9453KB
CollectionCount(0):1.00

private static ConcurrentDictionary<Enum, string> _ConcurrentDictionary = new ConcurrentDictionary<Enum, string>();
public static string GetDescriptionByConcurrentDictionary(this Enum @this)
{
return _ConcurrentDictionary.GetOrAdd(@this, (key) =>
{
var type = key.GetType();
var field = type.GetField(key.ToString());
return field == null ? key.ToString() : GetDescription(field);
});
}

[Test]
public void GetDescriptionByConcurrentDictionary_Test()
{
var enums = this.GetTestEnums();
Console.WriteLine(enums.Count);
TestHelper.InvokeAndWriteAll(() =>
{
System.Threading.Tasks.Parallel.For(0, 1000000, (i, obj) =>
{
foreach (var item in enums)
{
var a = item.GetDescriptionByConcurrentDictionary();
}
});
});
}
//测试结果：
80
TimeSpan:1,303.0000ms
MemoryUsed:198.0859KB
CollectionCount(0):1.00 

/// <summary>
/// 获取枚举的描述信息(Descripion)。
/// 支持位域，如果是位域组合值，多个按分隔符组合。
/// </summary>
public static string GetDescription(this Enum @this)
{
return _ConcurrentDictionary.GetOrAdd(@this, (key) =>
{
var type = key.GetType();
var field = type.GetField(key.ToString());
//如果field为null则应该是组合位域值，
return field == null ? key.GetDescriptions() : GetDescription(field);
});
}
/// <summary>
/// 获取位域枚举的描述，多个按分隔符组合
/// </summary>
public static string GetDescriptions(this Enum @this, string separator = ",")
{
var names = @this.ToString().Split(',');
string[] res = new string[names.Length];
var type = @this.GetType();
for (int i = 0; i < names.Length; i++)
{
var field = type.GetField(names[i].Trim());
if (field == null) continue;
res[i] = GetDescription(field);
}
return string.Join(separator, res);
}
private static string GetDescription(FieldInfo field)
{
var att = System.Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute), false);
return att == null ? field.Name : ((DescriptionAttribute)att).Description;
}

public enum TimeOfDay 
{ 
[Description("早晨")] 
Moning = 1, 
[Description("下午")] 
Afternoon = 2, 
[Description("晚上")] 
Evening = 3, 
} 

public static string GetDescriptionFromEnumValue(Type enumType, object enumValue)
{
try
{
object o = Enum.Parse(enumType, enumValue.ToString());
string name = o.ToString();
DescriptionAttribute[] customAttributes = (DescriptionAttribute[])enumType.GetField(name).GetCustomAttributes(typeof(DescriptionAttribute), false);
if ((customAttributes != null) && (customAttributes.Length == 1))
{
return customAttributes[0].Description;
}
return name;
}
catch
{
return "未知";
}
}

string strMoning = GetDescriptionFromEnumValue( typeof (TimeOfDay) , 2 );