internal static void CreateExtensionDataProperty(
object obj,
JsonPropertyInfo jsonPropertyInfo,
JsonSerializerOptions options)
{
Debug.Assert(jsonPropertyInfo != null);
object?extensionData = jsonPropertyInfo.GetValueAsObject(obj);
if (extensionData == null)
{
// Create the appropriate dictionary type. We already verified the types.
#if DEBUG
Type underlyingIDictionaryType = jsonPropertyInfo.PropertyType.GetCompatibleGenericInterface(typeof(IDictionary <,>)) !;
Type[] genericArgs = underlyingIDictionaryType.GetGenericArguments();
Debug.Assert(underlyingIDictionaryType.IsGenericType);
Debug.Assert(genericArgs.Length == 2);
Debug.Assert(genericArgs[0].UnderlyingSystemType == typeof(string));
Debug.Assert(
genericArgs[1].UnderlyingSystemType == JsonTypeInfo.ObjectType ||
genericArgs[1].UnderlyingSystemType == typeof(JsonElement) ||
genericArgs[1].UnderlyingSystemType == typeof(Nodes.JsonNode));
#endif
Func <object>?createObjectForExtensionDataProp = jsonPropertyInfo.JsonTypeInfo.CreateObject
?? jsonPropertyInfo.JsonTypeInfo.CreateObjectForExtensionDataProperty;
if (createObjectForExtensionDataProp == null)
{
// Avoid a reference to the JsonNode type for trimming
if (jsonPropertyInfo.PropertyType.FullName == JsonTypeInfo.JsonObjectTypeName)
{
ThrowHelper.ThrowInvalidOperationException_NodeJsonObjectCustomConverterNotAllowedOnExtensionProperty();
}
else
{
ThrowHelper.ThrowNotSupportedException_SerializationNotSupported(jsonPropertyInfo.PropertyType);
}
}
extensionData = createObjectForExtensionDataProp();
jsonPropertyInfo.SetExtensionDictionaryAsObject(obj, extensionData);
}
// We don't add the value to the dictionary here because we need to support the read-ahead functionality for Streams.
}
