JSON反序列化到一个对象Json.NET

问题描述：

我打一点点用新的计算器API 。不幸的是，我的JSON是有点弱，所以我需要一些帮助。

I'm playing a little bit with the new * API. Unfortunately, my JSON is a bit weak, so I need some help.

我想反序列化这个JSON的用户：

I'm trying to deserialize this JSON of a User:

  {"user":{
    "user_id": 1,
    "user_type": "moderator",
    "creation_date": 1217514151,
    "display_name": "Jeff Atwood",
    ...
    "accept_rate": 100
  }}

到我已经装饰了 JsonProperty 一个对象的属性：

[JsonObject(MemberSerialization.OptIn)]
public class User
{
    [JsonProperty("user_id", Required = Required.Always)]        
    public virtual long UserId { get; set; }

    [JsonProperty("display_name", Required = Required.Always)]
    public virtual string Name { get; set; }

    ...
}

我得到以下异常：

I get the following exception:

Newtonsoft.Json.JsonSerializationException：必需属性USER_ID'未找到在JSON。

Newtonsoft.Json.JsonSerializationException: Required property 'user_id' not found in JSON.

这是因为JSON对象是一个数组？如果是这样，我怎么能反序列化到一个User对象？

Is this because the JSON object is an array? If so, how can I deserialize it to the one User object?

在此先感谢！

答

由于亚历山大茉莉在你的问题的评论说，由此产生的JSON有各地的实际用户一个包装对象你要反序列化。

As Alexandre Jasmin said in the comments of your question, the resulting JSON has a wrapper around the actual User object you're trying to deserialize.

一个变通办法将话说回来包装类：

A work-around would be having said wrapper class:

public class UserResults
{
    public User user { get; set; }
}

然后反序列化将工作：

Then the deserialization will work:

using (var sr = new StringReader(json))
using (var jr = new JsonTextReader(sr))
{
    var js = new JsonSerializer();
    var u = js.Deserialize<UserResults>(jr);
    Console.WriteLine(u.user.display_name);
}

将有这个包装，如未来的元数据属性响应时间戳记，所以它不是一个坏主意，用它！

There will be future metadata properties on this wrapper, e.g. response timestamp, so it's not a bad idea to use it!

JSON反序列化到一个对象Json.NET

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