Apple的iTunes Genre ID服务返回的JSON与我过去遇到过的其他JSON不同。因此，我无法构建反序列化所需的类。
以下是JSON的一个示例（我为了清楚起见将其剪下来;可以找到完整的JSON here）：
{
"26": {
"name": "Podcasts",
"id": "26",
"url": "https://itunes.apple.com/us/genre/podcasts/id26?mt=2",
"subgenres": {
"1301": {
"name": "Arts",
"id": "1301",
"url": "https://itunes.apple.com/us/genre/podcasts-arts/id1301?mt=2",
"subgenres": {
"1306": {
"name": "Food",
"id": "1306",
"url": "https://itunes.apple.com/us/genre/podcasts-arts-food/id1306?mt=2"
},
"1401": {
"name": "Literature",
"id": "1401",
"url": "https://itunes.apple.com/us/genre/podcasts-arts-literature/id1401?mt=2"
},
"1402": {
"name": "Design",
"id": "1402",
"url": "https://itunes.apple.com/us/genre/podcasts-arts-design/id1402?mt=2"
},
"1405": {
"name": "Performing Arts",
"id": "1405",
"url": "https://itunes.apple.com/us/genre/podcasts-arts-performing-arts/id1405?mt=2"
},
"1406": {
"name": "Visual Arts",
"id": "1406",
"url": "https://itunes.apple.com/us/genre/podcasts-arts-visual-arts/id1406?mt=2"
},
"1459": {
"name": "Fashion & Beauty",
"id": "1459",
"url": "https://itunes.apple.com/us/genre/podcasts-arts-fashion-beauty/id1459?mt=2"
}
}
},
"1321": {
"name": "Business",
"id": "1321",
"url": "https://itunes.apple.com/us/genre/podcasts-business/id1321?mt=2",
"subgenres": {
"1410": {
"name": "Careers",
"id": "1410",
"url": "https: //itunes.apple.com/us/genre/podcasts-business-careers/id1410?mt=2"
},
"1412": {
"name": "Investing",
"id": "1412",
"url": "https: //itunes.apple.com/us/genre/podcasts-business-investing/id1412?mt=2"
},
"1413": {
"name": "Management&Marketing",
"id": "1413",
"url": "https: //itunes.apple.com/us/genre/podcasts-business-management/id1413?mt=2"
},
"1471": {
"name": "BusinessNews",
"id": "1471",
"url": "https: //itunes.apple.com/us/genre/podcasts-business-business/id1471?mt=2"
},
"1472": {
"name": "Shopping",
"id": "1472",
"url": "https: //itunes.apple.com/us/genre/podcasts-business-shopping/id1472?mt=2"
}
}
}
}
}
}
以下是我接收数据的课程：
public class PodcastGenreResult
{
public PodcastGenreInfo GenreInfo { get; set; }
}
public class PodcastGenreInfo
{
[JsonProperty("name")]
public string GenreName { get; set; }
}
这是反序列化调用：
PodcastGenreResult result = JsonConvert.DeserializeObject<PodcastGenreResult>(sResults);
其中sResults是JSON字符串。我已经确认此字符串包含正确的数据。
在此之后，不会抛出任何错误，但result.GenreInfo始终为空。我尝试了其他方法，但这是我觉得最接近的方法。大多数情况下，我使用JsonProperty属性来指定我想要的对象，但我不能在这里因为根名称根据我要求的ID而改变。如何定义我的类以反序列化数据？
答案 0 :(得分：0)
在我看来问题是设计糟糕的json，使用了类型id而不是属性名称。 json应该是这样的：
{"genre":{"name":"Podcasts","id":"26", ...
"subgenres":{"genre": {"name":"Arts","id":"1301","url":
而不是：
{"26":{"name":"Podcasts","id":"26", ...
"subgenres":{"1301":{"name":"Arts","id":"1301","url":
我会将json加载到动态对象中：
dynamic genres = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<dynamic>(json);
如果您希望可以将动态对象转换为强类型对象。
答案 1 :(得分：0)
这实际上很常见。要处理键是动态的对象，您需要反序列化为Dictionary<string, T>，其中T是您的项目类。所以在你的情况下：
Dictionary<string, PodcastGenreInfo> genres =
JsonConvert.DeserializeObject<Dictionary<string, PodcastGenreInfo>>(sResults);
另请注意，类型对象的subgenres属性是相同的，因此您也可以将其定义为字典：
public class PodcastGenreInfo
{
[JsonProperty("name")]
public string GenreName { get; set; }
[JsonProperty("subgenres")]
public Dictionary<string, PodcastGenreInfo> Subgenres { get; set; }
}
这是一个有效的演示：
class Program
{
static void Main(string[] args)
{
using (WebClient client = new WebClient())
{
string url = "http://itunes.apple.com/WebObjects/MZStoreServices.woa/ws/genres?id=26";
string json = client.DownloadString(url);
var genres = JsonConvert.DeserializeObject<Dictionary<string, PodcastGenreInfo>>(json);
Dump(new PodcastGenreInfo { GenreName = "Genres", Subgenres = genres }, "");
}
}
private static void Dump(PodcastGenreInfo genre, string indent)
{
Console.WriteLine(indent + genre.GenreName);
if (genre.Subgenres != null)
foreach (var kvp in genre.Subgenres)
Dump(kvp.Value, indent + " ");
}
public class PodcastGenreInfo
{
[JsonProperty("name")]
public string GenreName { get; set; }
[JsonProperty("subgenres")]
public Dictionary<string, PodcastGenreInfo> Subgenres { get; set; }
}
}
输出：
Genres
Podcasts
Arts
Design
Fashion & Beauty
Food
Literature
Performing Arts
Visual Arts
Business
Business News
Careers
Investing
Management & Marketing
Shopping
Comedy
Education
Educational Technology
Higher Education
K-12
Language Courses
Training
Games & Hobbies
Automotive
Aviation
Hobbies
Other Games
Video Games
Government & Organizations
Local
National
Non-Profit
Regional
Health
Alternative Health
Fitness & Nutrition
Self-Help
Sexuality
Kids & Family
Music
News & Politics
Religion & Spirituality
Buddhism
Christianity
Hinduism
Islam
Judaism
Other
Spirituality
Science & Medicine
Medicine
Natural Sciences
Social Sciences
Society & Culture
History
Personal Journals
Philosophy
Places & Travel
Sports & Recreation
Amateur
College & High School
Outdoor
Professional
TV & Film
Technology
Gadgets
Podcasting
Software How-To
Tech News