C#通過反射進行枚舉描述相關操作

C#可以通過反射，來獲取枚舉的描述信息或通過描述信息獲取到指定類型的枚舉

/// <summary>
/// 獲取枚舉描述
/// </summary>
/// <param name="enumName"></param>
/// <returns></returns>
public static string GetDescription(this Enum enumName)
{
    string description;
    FieldInfo fieldInfo = enumName.GetType().GetField(enumName.ToString());
    DescriptionAttribute[] attributes = fieldInfo.GetDescriptAttr();
    if (attributes != null && attributes.Length > 0)
        description = attributes[0].Description;
    else
        throw new ArgumentException($"{enumName} 未能找到對應的枚舉描述.", nameof(enumName));
    return description;
}

/// <summary>
/// 獲取枚舉描述屬性
/// </summary>
/// <param name="fieldInfo"></param>
/// <returns></returns>
private static DescriptionAttribute[] GetDescriptAttr(this FieldInfo fieldInfo)
{
    return (DescriptionAttribute[])fieldInfo?.GetCustomAttributes(typeof(DescriptionAttribute), false);
}

/// <summary>
/// 通過描述獲取枚舉值
/// </summary>
/// <typeparam name="TEnum"></typeparam>
/// <param name="description"></param>
/// <returns></returns>
public static TEnum GetEnum<TEnum>(string description)
{
    Type type = typeof(TEnum);
    foreach (FieldInfo field in type.GetFields())
    {
        DescriptionAttribute[] curDesc = field.GetDescriptAttr();
        if (curDesc != null && curDesc.Length > 0)
        {
            if (curDesc[0].Description == description)
                return (TEnum)field.GetValue(null);
        }
        else
        {
            if (field.Name == description)
                return (TEnum)field.GetValue(null);
        }
    }
    throw new ArgumentException($"{description} 未能找到對應的枚舉.", nameof(description));
}