反序列化为JObject时获取类型名称

问题描述

使用Deserialize时是否可以获取$ type属性?我使用TypeNameHandling进行序列化，但是当我反序列化时，我没有包含类型信息的程序集.我需要使用Type名称将其存储在正确的集合中，看起来$ type不会被带到JObject中.

Is there a way to get the $type property when using Deserialize ? I serialize with TypeNameHandling on, but when I deserialize, I don't have the assemblies that contain the type information. I need to use the Type name to store it in the right collection, it looks like $type is not brought over to the JObject.

如果我反序列化为JObject，则可以获得$ type，但是如果我反序列化为以对象为属性的类，则该类型为null.不知道为什么在json中会因为$ type而将其剥离.下面的示例:

If I deserialize as a JObject, I can get the $type, but if I deserialize as a class that has an object as a property, the type is null. Not sure why its getting stripped out as the $type exists in the json. Example below:

班级

public class Container {
    public object Test { get; set; }
}

反序列化代码

var container = new Container {
    Test = new Snarfblat()
};


var json = JsonConvert.SerializeObject(container,
new JsonSerializerSettings {
    TypeNameHandling = TypeNameHandling.Objects
});
var deserializedContainer = JsonConvert.DeserializeObject<Container>(json);

var type = ((JObject) deserializedContainer.Test)["$type"];
// Type is null

var deserializedContainer2 = JsonConvert.DeserializeObject<JObject>(json);

var type2 = deserializedContainer2["Test"]["$type"];
// Type is snarfblat

推荐答案

在反序列化时，可以通过将MetadataPropertyHandling设置为Ignore来防止Json.Net使用$type属性:

You can prevent Json.Net from consuming the $type property by setting MetadataPropertyHandling to Ignore when you deserialize:

var deserializedContainer = JsonConvert.DeserializeObject<Container>(json,
    new JsonSerializerSettings {
        MetadataPropertyHandling = MetadataPropertyHandling.Ignore
    });

var type = ((JObject) deserializedContainer.Test)["$type"];
// Type is Snarfblat

提琴: https://dotnetfiddle.net/VBGVue

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