JSON序列化到多个属性 [英] Deserialize JSON to multiple properties

问题描述

我编程对第三方API，返回JSON数据，但格式可以是一个有些奇怪。某些属性可以是一个对象（其中包含一个Id属性），或一个字符串（这是该对象的ID）。例如，下面的两个都是有效的：

I am programming against a third party API which returns JSON data, but the format can be a little strange. Certain properties can either be an object (which contains an Id property), or a string (which is the Id of the object). For example, both of the following are valid:

{
    ChildObject: 'childobjectkey1'
}

和

{
    ChildObject: {
        Id: 'childobjectkey1',
        // (other properties)
    }
}

我想这反序列化使用JSON.net成一个强类型的类，但还没有多少运气至今。我最好的想法是把它序列化到两个属性，一个是字符串，而其他的对象，并使用自定义JsonConverter每个允许变量行为：

I'm trying to deserialize this using JSON.net into a strongly typed class, but haven't had much luck so far. My best idea was to serialise it to two properties, one a string and the other an object, and to use a custom JsonConverter for each to allow for the variable behaviour:

public abstract class BaseEntity
{
    public string Id { get; set; }
}

public class ChildObject : BaseEntity { }

public class MyObject
{
    [JsonProperty("ChildObject")]
    [JsonConverter(typeof(MyCustomIdConverter))]
    public string ChildObjectId { get; set; }

    [JsonProperty("ChildObject")]
    [JsonConverter(typeof(MyCustomObjectConverter))]
    public ChildObject ChildObject { get; set; }
}

不过，设置 JsonProperty 上具有相同属性名的两个属性属性导致异常：

However, setting the JsonProperty attribute on two properties with the same PropertyName causes the exception:

Newtonsoft.Json.JsonSerializationException：名为$ b的成员$ b'ChildObject'已经存在于'......。
使用JsonPropertyAttribute指定另一个名字。

Newtonsoft.Json.JsonSerializationException: A member with the name 'ChildObject' already exists on '.....'. Use the JsonPropertyAttribute to specify another name.

我相当肯定的JsonConverter方法​​将工作，如果我能得到过这个障碍 - 我怀疑的错误是存在的，因为JsonProperty属性用于序列化和反序列化的。在这种情况下我在序列化这个类没有兴趣 - 它仅会被用作目标反序列化

I'm fairly sure the JsonConverter approach will work if I can get over this hurdle - I suspect the error is there because the JsonProperty attribute is used for Serialization as well as Deserialization. In this instance I have no interest in Serializing this class - it will only ever be used as the target for Deserialization.

我有超过远端没有控制（这是一个第三方API），但我想应该能实现这个序列化。我不介意它的使用，我已经开始对方法，或者一个我还没想到的

I have no control over the remote end (it's a third party API), but I would like to be able to achieve this serialisation. I don't mind if it's using the approach I've started on, or one I've not thought of yet.

的This问题也有关，但没有答案。

This question is also related, but there were no answers.

推荐答案

试试这个（有一些彻底的验证扩展它，如果你能在你的代码中使用它）：

Try this (extend it with some thorough validation if you'll be using it in your code):

public class MyObject
{
    public ChildObject MyChildObject;
    public string MyChildObjectId;

    [JsonProperty("ChildObject")]
    public object ChildObject
    {
        get
        {
            return MyChildObject;
        }
        set
        {
            if (value is JObject)
            {
                MyChildObject = ((JToken)value).ToObject<ChildObject>();
                MyChildObjectId = MyChildObject.Id;
            }
            else
            {
                MyChildObjectId = value.ToString();
                MyChildObject = null;
            }
        }
    }
}

这篇关于JSON序列化到多个属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！