从描述属性获取枚举[重复]

• Z时代
• 2024-01-10
• 分类：问答

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));

回答：

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");

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