分配多个JsonProperty? [英] Assign Multiple JsonProperties?
问题描述
我正在尝试制作一个包含来自Facebook和Twitter的信息的数据类.
I am trying to make a single dataclass that holds information from both Facebook and Twitter.
但是在Twitter的JSON答复中，我需要id_str，从FaceBook中得到id.
but in my JSON reply from twitter I need id_str and from FaceBook I get id.
我需要将这两个放在id字符串中.
I need those two to be put into the id-string.
现在，如果我想将Twitters id_str反序列化为我的id -string，我知道可以使用[JsonProperty("id_str")].
Now I know I can use [JsonProperty("id_str")] if I want to deserialize Twitters id_str into my id-string.
但是，如果我需要将Facebook的id和Twitter的id_str都以与数据类中相同的id字符串反序列化，该怎么办?
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?
推荐答案
否，这是不可能的.
让我们看一下 Json.NET文档.特别是有关 JsonPropertyAttribute 类的帮助页面.
Let's take a look at the Json.NET documentation. In particular the help page about the JsonPropertyAttribute class.
引用:
指示JsonSerializer始终序列化具有指定名称的成员."
"Instructs the JsonSerializer to always serialize the member with the specified name."
它在Newtonsoft.Json命名空间中声明.我们需要确定如何声明它.让我们看一下CodePlex上Json.NET的源代码:
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:
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property |
AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class JsonPropertyAttribute : Attribute
{
//...
}
猜猜回答了这个问题.该属性的 AllowMultiple 属性设置为false.因此，使用该属性装饰属性，字段或参数不能一次以上.
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.
即使您可以如何期望Json.net找出要使用的属性?我将分别为Twitter和Facebook创建类型，您可以在这些类型中反序列化接收到的JSON数据.
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.
所以:
Twitter -> JSON -> Twitter specific types
Facebook -> JSON -> Facebook spefic types
然后创建一个应用程序使用的抽象，而不是直接解决这些类型.它们只是属于特定的社交媒体实现.
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/...特殊类型->您的类型
Twitter / Facebook / ... speficic types -> Your types
如果您直接尝试将数据反序列化为常见类型"，那么您将一直在努力，因为它们不会与接收到的数据100％对齐，并且您会发现一些时髦，难以理解的数据保持反序列化逻辑.
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.
另一种选择是创建自己的自定义Json.NET转换器.
Another option is to create your own custom Json.NET converter.
只需为Twitter和Facebook创建一个转换器，然后反序列化JSON数据时，只需指定要使用的转换器即可.
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
例如:
MySocialType myType = JsonConvert.DeserializeObject<Mapped>(json,
new TwitterConverter());
无论如何，我会尽量避免使用反序列化逻辑本身来污染您的类类型.
Anyway I would try to avoid polluting your class types with the deserialization logic itself.
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