从描述属性获取枚举[重复]

一尘不染

从描述属性获取枚举[重复]

我有一个通用的扩展方法，该方法从中获取Description属性Enum：

enum Animal
{
    [Description("")]
    NotSet = 0,

    [Description("Giant Panda")]
    GiantPanda = 1,

    [Description("Lesser Spotted Anteater")]
    LesserSpottedAnteater = 2
}

public static string GetDescription(this Enum value)
{            
    FieldInfo field = value.GetType().GetField(value.ToString());

    DescriptionAttribute attribute
            = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute))
                as DescriptionAttribute;

    return attribute == null ? value.ToString() : attribute.Description;
}

所以我可以做…

string myAnimal = Animal.GiantPanda.GetDescription(); // = "Giant Panda"

现在，我正在尝试在另一个方向上实现等效功能，例如…

Animal a = (Animal)Enum.GetValueFromDescription("Giant Panda", typeof(Animal));

阅读 344

2020-05-19

共1个答案

一尘不染

public static class EnumEx
{
public static T GetValueFromDescription(string description)
{
var type = typeof(T);
if(!type.IsEnum) throw new InvalidOperationException();
foreach(var field in type.GetFields())
{
var attribute = Attribute.GetCustomAttribute(field,
typeof(DescriptionAttribute)) as DescriptionAttribute;
if(attribute != null)
{
if(attribute.Description == description)
return (T)field.GetValue(null);
}
else
{
if(field.Name == description)
return (T)field.GetValue(null);
}
}
throw new ArgumentException(“Not found.”, nameof(description));
// or return default(T);
}
}

用法：

var panda = EnumEx.GetValueFromDescription<Animal>("Giant Panda");

2020-05-19