Incorrect data serialization for classes that extends Dictionary class

[3axap4eHko]

Describe the bug Incorrect data serialization for classes that extends Dictionary class

To Reproduce

1. Define a class

   public class D : Dictionary<string, object>{ }

2. Instantiate an object

   D objectValue = new D
   {
   ["property1"] = 20,
   ["property2"] = 30,
   };

3. Serialize it

   var serializer = new JsonSerializer();
   var jsonValue = serializer.Serialize(objectValue);

4. See error

   Console.WriteLine(jsonValue); // { }

Expected behavior If you replace class D to Dictionary<string, object> you will see

Console.WriteLine(jsonValue.Object.Count); // {"property1":20,"property2":30}

Desktop (please complete the following information):

• OS: Microsoft Windows [Version 10.0.19041.329]
  • .Net Target Fwk 4.8
• Version 13.0.2

[gregsdennis]

The serializer can't make assumptions on how to serialize a type based on the type's inheritance. If you were to add a property to D, then serializing the same way a dictionary is serialized would be wrong.

You need to tell the serializer how to handle that class, either by implementing IJsonSerializable on the class or by creating and registering an ISerializer implementation.