How Can Json.net Handle Serializing and Deserializing Derived Types?

Serialization and deserialization of derived types in Json.NET (Newtonsoft)

Json.NET provides flexibility in serializing and deserializing complex data structures. When dealing with derived types, it is crucial to preserve type information during serialization so that it deserializes correctly.

Json.NET implements this functionality through the JsonSerializerSettings attribute of the TypeNameHandling object. By setting this property to All, Json.NET will include the type name in the serialized output.

For example, consider the following base and derived classes:

public class Base
{
    public string Name;
}

public class Derived : Base
{
    public string Something;
}

To serialize and deserialize derived types:

// 序列化
var object1 = new Base() { Name = "Object1" };
var object2 = new Derived() { Something = "Some other thing" };
var inheritanceList = new List<Base>() { object1, object2 };

JsonSerializerSettings settings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All };
string serialized = JsonConvert.SerializeObject(inheritanceList, settings);

// 反序列化
var deserializedList = JsonConvert.DeserializeObject<List<Base>>(serialized, settings);

With this approach, Json.NET preserves type information, allowing derived types to be successfully deserialized. However, it is important to note that the serialized output will contain the types associated with the objects and any lists used to hold them.

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