How Can I Deserialize Collections of Interface Instances Using Json.Net?

Deserializing Interface Instance Collections

It's common to store data as instances of interfaces, such as in the example's ClassToSerializeViaJson. However, deserializing such collections can cause errors like the one mentioned in the question.

Solution:

To resolve the issue, Json.Net requires additional configuration to enable deserialization of interface instances.

1. Serialization:

   • Set TypeNameHandling to Objects to include the type name in the JSON payload.
   • Use FormatterAssemblyStyle.Simple to simplify the type name format.

string serializedJson = JsonConvert.SerializeObject(objectToSerialize, Formatting.Indented, new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.Objects,
    TypeNameAssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Simple
});

2. Deserialization:

   • Set TypeNameHandling to Objects to enable type identification during deserialization.

var deserializedObject = JsonConvert.DeserializeObject<ClassToSerializeViaJson>(serializedJson, new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.Objects
});

By implementing these settings, Json.Net can properly deserialize interface instance collections, allowing recovery of the original data structure.

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