vb.net 使用 newtonsoft.json 反序列化 List<AbstractClass>
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Deserialize a List<AbstractClass> with newtonsoft.json
提问by L.Trabacchin
i'm trying to serialize and deserialize a list of abstractclasses (mustinheritfor vb), obviusly inside it there are only instances of derived classes.
我正在尝试序列化和反序列化一个abstract类列表（mustinherit对于 vb），显然其中只有派生类的实例。
I've decorated the list parameter with the JsonProperty(ItemTypeNameHandling = TypeNameHandling.Auto)obtaining an output that look like this:
我已经使用JsonProperty(ItemTypeNameHandling = TypeNameHandling.Auto)获取如下所示的输出来修饰列表参数：
But when i deserialize it keep saying that he cannot deserialize an abstract class.
但是当我反序列化时，它一直说他不能反序列化一个抽象类。
http://james.newtonking.com/json/help/index.html?topic=html/SerializeTypeNameHandling.htm
http://james.newtonking.com/json/help/index.html?topic=html/SerializeTypeNameHandling.htm
public class ConcreteClass
{
private ObservableCollection<AbstractClass> _Nodes = new ObservableCollection<AbstractClass>();
//<Newtonsoft.Json.JsonProperty(itemtypenamehandling:=Newtonsoft.Json.TypeNameHandling.Auto)>
public ObservableCollection<AbstractClass> Nodes {
get { return this._Nodes; }
}
public string Name { get; set; }
public int Id { get; set; }
}
public abstract class AbstractClass
{
private ObservableCollection<AbstractClass> _Nodes = new ObservableCollection<AbstractClass>();
[Newtonsoft.Json.JsonProperty(itemtypenamehandling = Newtonsoft.Json.TypeNameHandling.Auto)]
public ObservableCollection<AbstractClass> Nodes {
get { return this._Nodes; }
}
}
removing the commented line it works!
删除注释行它有效！
回答by Timothy Walters
Make sure you specify TypeNameHandling when deserializing, as per the docs:
根据文档，请确保在反序列化时指定 TypeNameHandling：
// for security TypeNameHandling is required when deserializing
Stockholder newStockholder = JsonConvert.DeserializeObject<Stockholder>(jsonTypeNameAuto, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.Auto
});
It is worth noting that the documentation is deserializing a Concrete class that containsa collection of Abstract classes.
值得注意的是，该文档正在反序列化一个包含抽象类集合的Concrete类。
As an experiment try creating a throw-away class (concrete) that has a single property with your list of abstract objects and see if you can serialize and deserialize that.
作为实验，尝试创建一个一次性类（具体），该类具有带有抽象对象列表的单个属性，并查看是否可以对其进行序列化和反序列化。
UPDATE:
更新：
I just tested the following code in LINQPad:
我刚刚在 LINQPad 中测试了以下代码：
void Main()
{
var test = new List<Business>();
test.Add(new Hotel { Name = "Hilton", Stars = 5 });
test.Add(new Pool { Name = "Big Splash", Capacity = 500 });
test.Dump();
string json = JsonConvert.SerializeObject(test, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All
});
json.Dump();
var businesses = JsonConvert.DeserializeObject<List<Business>>(json, new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All
});
businesses.Dump();
}
// Define other methods and classes here
public abstract class Business
{
public string Name { get;set; }
}
public class Hotel : Business
{
public int Stars { get;set; }
}
public class Pool : Business
{
public int Capacity { get;set;}
}
It worked perfectly. Abstract collection serialized to:
它工作得很好。抽象集合序列化为：
{
"$type": "System.Collections.Generic.List`1[[UserQuery+Business, query_jvrdcu]], mscorlib",
"$values": [
{
"$type": "UserQuery+Hotel, query_jvrdcu",
"Stars": 5,
"Name": "Hilton"
},
{
"$type": "UserQuery+Pool, query_jvrdcu",
"Capacity": 500,
"Name": "Big Splash"
}
]
}
The original and the deserialized collections matched.
原始集合和反序列化集合匹配。
