将原始JSON字符串存储在反序列化的JSON.NET对象中 [英] Storing original JSON string in deserialised JSON.NET objects

问题描述

这基本上是问题 Newtonsoft对象的后续→获取JSON字符串.

我有一个看起来像这样的对象:

I have an object that looks like this:

[JsonConverter(typeof(MessageConverter))]
public class Message
{
    public Message(string original)
    {
        this.Original = original;
    }

    public string Type { get; set; }

    public string Original { get; set; }
}

我的要求是在初始化时将原始JSON字符串存储为对象的一部分.我已经能够(部分)使用自定义的 JsonConverter 成功实现了这一目标，然后基本上在 JsonConverter 中做到了这一点:

My requirement is to store the original JSON string as part of the object when I initialise it. I have been able to (partially) successfully achieve this using a custom JsonConverter and then basically doing something like this in the JsonConverter:

public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
    if (reader.TokenType == Newtonsoft.Json.JsonToken.Null)
        return null;

    JObject obj = JObject.Load(reader);
    return new Message(obj.ToString(Formatting.None))
    {
        Type = obj["type"].ToString()
    };
}

但是我遇到的问题是当我尝试从

However the problem I run into is when I try to inherit from Message with something like

public class CustomMessage : Message
{
    public string Prop1 { get; set; }
}

出于明显的原因，我的代码失败，因为它试图返回一个新的 Message()而不是一个新的 CustomMessage().

For obvious reasons my code fails because it tries to return a new Message() not a new CustomMessage().

缺少对所有子类型实现大型if语句并使用 JObject ["prop"].ToObject< T>()之类的方法进行手动绑定的方法，我该如何成功填充 Original 属性，同时仍使用默认的反序列化绑定我的所有子类型值?

So short of implementing a big if statement with all my sub-types and manually binding using something like JObject["prop"].ToObject<T>() how can I successfully populate the Original property while still binding all my sub-type values using the default deserialisation?

注意:之所以这样做，是因为原始消息可能包含未实际绑定的数据，所以我不能仅添加一个将对象按原样序列化的属性./em>

推荐答案

我将问题悬而未决，希望有人能提供更好的答案，但我暂时使用了以下解决方案来解决我的问题.

I'm leaving the question open in the hope that someone comes up with a better answer but I've temporarily used the following solution to resolve my problem.

public static class MessageExtensions
{
    public static T Deserialize<T>(this string message) where T : Message
    {
        T instance = Activator.CreateInstance<T>();
        instance.Original = message;
        JsonConvert.PopulateObject(message, instance);
        return instance;
    }
}

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