是否有过分配多个Jsonproperties的方法吗？ [英] Is there a way too assign multiple Jsonproperties?

问题描述

我想使保存来自Facebook和Twitter信息的单个数据类。

但在从Twitter我的JSON的答复，我需要ID_STR，并从Facebook我得到的身份证。

我需要这两个被放入了ID-string。

现在我知道我可以使用[JsonProperty（ID_STR）]如果我想Twitter的反序列化到ID_STR我的ID-string。但如果我同时需要Facebook的ID和Twitter的ID_STR在同一个ID反序列化-string我有我的数据类？

解决方案

没有，这是不可能的。

让我们来看看在的 Json.NET文档。在讲究 JsonPropertyAttribute 类的帮助页面。

要报价：

指示JsonSerializer总是序列化的成员具有指定名称

它在Newtonsoft.Json命名空间中声明。我们需要确定它是如何声明。让我们来看看在CodePlex上的Json.NET的源代码：

的 http://json.codeplex.com/

  [AttributeUsage（AttributeTargets.Field | AttributeTargets.Property | 
 AttributeTargets.Parameter，的AllowMultiple = FALSE）] 
公共密封类JsonPropertyAttribute：属性
 {
 // ... 
} 
  

想这回答了这个问题。该属性的的AllowMultiple 属性设置为false。所以，你可以不装饰的属性，字段或参数比此属性一次。

即使你能你怎么能指望Json.net找出哪些属性使用？

<$：我想创建类型为Twitter和Facebook分别在其中你可以反序列化接收到的JSON数据

所以， p $ p> 微博 - > JSON - > Twitter的特定类型的
Facebook的 - > JSON - > Facebook的spefic类型


然后创建一个应用程序使用，而不是直接处理这些类型的抽象。他们只是属于一个特定的社交媒体实施

的Twitter / Facebook的/ ... speficic类型 - >您的类型

如果您直接尝试将数据反序列化到常用类型，那么你只是要保持挣扎，因为它们不与接收到的数据对齐100％，你会用一些时髦风，难维持反序列化逻辑。

另一个选择是创建自己的定制Json.NET转换器。

的 http://geekswithblogs.net/DavidHoerster/存档/ 2011/7月26日/ json.net定制-convertersndasha-快速tour.aspx

刚刚创建Twitter和Facebook，当转换器你反序列化JSON数据，就指定要使用的转换器。

• TwitterConverter


• FacebookConverter

例如：

  MySocialType的myType = JsonConvert.DeserializeObject&所述;映射>（JSON，
新TwitterConverter（））; 
  

无论如何，我会尽力避免与反序列化逻辑本身污染类的类型。

I am trying to make a single dataclass that holds information from both Facebook and Twitter.

but in my JSON reply from twitter I need "id_str" and from facebook I get "id".

I need those two to be put into the "id"-string.

Now I know I can use [JsonProperty("id_str")] if I want to deserialize Twitters id_str into my "id"-string. But what if I need both Facebook's "id" and Twitters "id_str" to be deserialized in the same "id"-string I have in my dataclass?

解决方案

No, this is not possible.

Let's take a look at the Json.NET documentation. In particular the help page about the JsonPropertyAttribute class.

To quote:

"Instructs the JsonSerializer to always serialize the member with the specified name."

It's declared in the Newtonsoft.Json namespace. We need to determine how it is declared. Let's take a look at the Json.NET's source code on CodePlex:

http://json.codeplex.com/

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property |     
 AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class JsonPropertyAttribute : Attribute
{
    //...
}

Guess that answers the question. The AllowMultiple property of the attribute is set to false. So you can't decorate a property, field or parameter more than once with this attribute.

Even if you could how do you expect Json.net to figure out which attribute to use? I would create types for Twitter and Facebook separately into which you can deserialize the received JSON data.

So:

Twitter -> JSON -> Twitter specific types
Facebook -> JSON -> Facebook spefic types

Then create an abstraction which your application uses instead of addressing these types directly. They just belong to a specific social media implementation.

Twitter / Facebook / ... speficic types -> Your types

If you directly try to deserialize the data into your "common types", then you are just going to keep struggling because they don't align 100% with the received data and you'll wind up with some funky, hard to maintain deserialization logic.

Another option is to create your own custom Json.NET converter.

http://geekswithblogs.net/DavidHoerster/archive/2011/07/26/json.net-custom-convertersndasha-quick-tour.aspx

Just create a converter for Twitter and Facebook and when you deserialize the JSON data, just specify which converter you want to use.

• TwitterConverter
• FacebookConverter

E.g.:

MySocialType myType = JsonConvert.DeserializeObject<Mapped>(json, 
    new TwitterConverter());

Anyway I would try to avoid polluting your class types with the deserialization logic itself.

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