system.formatexception：在估算XXX属性的XXX属性时发生错误：未知的歧视器值＆＃x27; jsonelement＆＃x27;

Question

我正在使用MongoDB进行ASP.NET核心项目。

我想从hotelbookingdocument获取预订酒店的列表。

public class HotelBookingDocument
{
    public string Id { get; set; }
    public HotelDocument Hotel { get; set; }
// removed rest 
}

public class HotelDocument
{
    public List<RoomDocument> Rooms { get; set; }
// removed rest 
}

public class RoomDocument
{
      public object SupplierReference { get; set; }
// removed rest 
}
// removed rest 

查询

BsonClassMap.RegisterClassMap<HotelBookingDocument>(cm =>
{
  cm.AutoMap();
  cm.SetIgnoreExtraElements(true);
  cm.MapIdMember(c => c.Id)
    .SetSerializer(new StringSerializer(BsonType.ObjectId))
    .SetIgnoreIfDefault(true);
});

BsonClassMap.RegisterClassMap<HotelBookingDocument.RoomDocument>(cm =>
{
  cm.AutoMap();
});
            BsonClassMap.RegisterClassMap<HotelBookingDocument.HotelDocument>(cm =>
{
  cm.AutoMap();
});

屏幕

public async Task<List<HotelBookingDocument>> GetHotelsList(string transactionId)
{
  var hotels = await HotelBookingCollection.Find(x => x.TransactionId == transactionId).ToListAsync();   // this does not work
  return hotels;
}

数据库中供应权属性的

配置 截图。

​

"SupplierReference": {
                "_t": "JsonElement"
            },

错误：

System.FormatException: An error occurred while deserializing the Hotel property of class HotelBookingDocument: An error occurred while deserializing the Rooms property of class HotelBookingDocument+HotelDocument: An error occurred while deserializing the SupplierReference property of class HotelBookingDocument+RoomDocument: Unknown discriminator value 'JsonElement'.
---> System.FormatException: An error occurred while deserializing the Rooms property of class HotelBookingDocument+HotelDocument: An error occurred while deserializing the SupplierReference property of class HotelBookingDocument+RoomDocument: Unknown discriminator value 'JsonElement'.
---> System.FormatException: An error occurred while deserializing the SupplierReference property of class HotelBookingDocument+RoomDocument: Unknown discriminator value 'JsonElement'.
---> MongoDB.Bson.BsonSerializationException: Unknown discriminator value 'JsonElement'.
 at MongoDB.Bson.Serialization.BsonSerializer.LookupActualType(Type nominalType, BsonValue discriminator)
 at MongoDB.Bson.Serialization.Conventions.ObjectDiscriminatorConvention.GetActualType(IBsonReader bsonReader, Type nominalType)
 at MongoDB.Bson.Serialization.Serializers.ObjectSerializer.DeserializeDiscriminatedValue(BsonDeserializationContext context, BsonDeserializationArgs args)
 at MongoDB.Bson.Serialization.Serializers.ObjectSerializer.Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
 at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)...............

当我尝试通过Transaction Id从HotelbookingCollection获取酒店书列表时，我会出现错误。 但是我发现酒店书收录的酒店书籍我没有遇到任何错误。我可以第一次获得酒店书。

为什么发生此错误？

请帮助我找到这个问题。

谢谢