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I need to retrieve children from a notion block (page). I use C# with Notion.Net library. There's a database, with other pages at rows. I'm trying to retrieve such page's children with

await notion.Blocks.RetrieveChildrenAsync(id);

It causes an exception:

Newtonsoft.Json.JsonSerializationException: Could not create an instance of type Notion.Client.IBlock. Type is an interface or abstract class and cannot be instantiated. Path 'object', line 1, position 68129.
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewObject(JsonReader reader, JsonObjectContract objectContract, JsonProperty containerMember, JsonProperty containerProperty, String id, Boolean& createdFromNonDefaultCreator)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.Serialization.JsonSerializerProxy.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
   at JsonSubTypes.JsonSubtypes.ThreadStaticReadObject(JsonReader reader, JsonSerializer serializer, JToken jToken, Type targetType)
   at JsonSubTypes.JsonSubtypes.ReadObject(JsonReader reader, Type objectType, JsonSerializer serializer)
   at JsonSubTypes.JsonSubtypes.ReadJson(JsonReader reader, Type objectType, JsonSerializer serializer)
   at JsonSubTypes.JsonSubtypes.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader)
   at Notion.Client.Extensions.HttpResponseMessageExtensions.ParseStreamAsync[T](HttpResponseMessage response, JsonSerializerSettings serializerSettings)
   at Notion.Client.RestClient.GetAsync[T](String uri, IDictionary`2 queryParams, IDictionary`2 headers, JsonSerializerSettings serializerSettings, CancellationToken cancellationToken)
   at Notion.Client.BlocksClient.RetrieveChildrenAsync(String blockId, BlocksRetrieveChildrenParameters parameters)

I already used other notion library with python. Even now It successfully retrieves block children with the same Id. I don't know, how to solve It(

I expected to get all page block children. It seems, that some serialization errors occured. I can't find difference between cases.

Eugene
  • 1

0 Answers0