MongoDB 想要映射对象特征的 GeoJSON BoundingBox 属性

Question

我想使用 GeoJSON 特征对象来表示我 中的位置ASP.Net 核心网站 API。我习惯于使用以下代码将样本数据插入到我的 MongoDb 数据库:

db.Measurements.insertMany([{
        'Degree': 1.3,
        'Location': {
           "type": "Feature",
           "geometry": {
             "type": "Point",
             "coordinates": [49.04852804478914, 9.173037938241464]
           },
           "properties": {
             "name": "Neckar"
           }
         },
        'MeasurementTime': ISODate("2020-03-10T10:50:42.389Z"),
        'MachineId': '6dsfal865kkl34l32'
    }, ...

为了映射此数据，我在下面编写了模型 class，following the instructions in Docs。

using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;
using BAMCIS.GeoJSON;
using System;

public class Measurement
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string Id { get; set; }

    [BsonElement]
    public decimal PollutionDegree { get; set; }

    [BsonElement]
    public Feature Location { get; set; }

    // 
    [BsonElement]
    [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
    public DateTime MeasurementTime { get; set; }

    [BsonElement]
    public string MachineId { get; set; }
}

API 在没有 Location 的情况下工作正常，但是当我取消注释这两行并将数据添加到我的测量集合中时，我收到以下错误消息：

    An exception of type 'System.FormatException' occurred in MongoDB.Bson.dll but
was not handled in user code: 'An error occurred while deserializing the Location
 property of class API.Models.Measurement: Member 'BoundingBox' is not mapped.'

     Inner exceptions found, see $exception in variables window for more details.
     Innermost exception     MongoDB.Bson.BsonSerializationException : Member 'BoundingBox' is not mapped.
       at MongoDB.Bson.Serialization.BsonCreatorMap.Freeze()
       at MongoDB.Bson.Serialization.BsonClassMap.Freeze()
       at MongoDB.Bson.Serialization.BsonClassMap.LookupClassMap(Type classType)
       at MongoDB.Bson.Serialization.BsonClassMapSerializationProvider.GetSerializer(Type type, IBsonSerializerRegistry serializerRegistry)
       at MongoDB.Bson.Serialization.BsonSerializerRegistry.CreateSerializer(Type type)
       at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
       at MongoDB.Bson.Serialization.BsonSerializerRegistry.GetSerializer(Type type)
       at MongoDB.Bson.Serialization.BsonSerializer.LookupSerializer(Type type)
       at MongoDB.Bson.Serialization.BsonMemberMap.GetSerializer()
       at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.DeserializeMemberValue(BsonDeserializationContext context, BsonMemberMap memberMap)

现在，我不明白这个错误信息如下：

它表示由于缺少 BoundingBox 属性而引发异常。但是 BoundingBox 似乎并不是特征对象的强制性属性。

根据 RFC696，边界框不是 properties that a Feature Object has to possess. Moreover, a Bounding Box is described as it MAY be a part of a Feature object 之一。

如果有人能解释需要做什么才能正确读取数据，我将不胜感激。

Answer 1

MongoDB 仅支持 GeoJSON 对象的一个子集。请参阅文档中的 GeoJSON Object。

这是一个简短的列表：

点
线串
多边形
多点
多线串
多边形
几何集合

MongoDB 想要映射对象特征的 GeoJSON BoundingBox 属性

MongoDB wants GeoJSON BoundingBox property of object Feature to be mapped

coordinates

mongodb

geojson

asp.net-core