Question

我的数据库中的文档是使用node.js创建的。 https://github.com/mongodb/node-mongodb-native我正在使用mongodb c＃驱动程序，当我尝试访问它时出错。我猜node.js驱动程序创建的objectid与c＃驱动程序创建的目标不同。

Unhandled Exception: System.IO.FileFormatException: An error occurred while deserializing the _id property of class trader.Formula: 'CD2j7m4qDLMowGCXi' is not a valid 24 digit hex string. ---> System.FormatException: 'CD2j7m4qDLMowGCXi' is not a valid 24 digit hex string.
  at MongoDB.Bson.ObjectId.Parse(String s)
  at MongoDB.Bson.Serialization.Serializers.ObjectIdSerializer.Deserialize(BsonReader bsonReader, Type nominalType, Type actualType, IBsonSerializati onOptions options)
  at MongoDB.Bson.Serialization.BsonClassMapSerializer.DeserializeMemberValue(BsonReader bsonReader, BsonMemberMap memberMap)
  --- End of inner exception stack trace ---
  at MongoDB.Bson.Serialization.BsonClassMapSerializer.DeserializeMemberValue(BsonReader bsonReader, BsonMemberMap memberMap)
  at MongoDB.Bson.Serialization.BsonClassMapSerializer.Deserialize(BsonReader bsonReader, Type nominalType, Type actualType, IBsonSerializationOptions options)
  at MongoDB.Bson.Serialization.BsonClassMapSerializer.Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options)
  at MongoDB.Driver.Internal.MongoReplyMessage`1.ReadFrom(BsonBuffer buffer, IBsonSerializationOptions serializationOptions)
  at MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument](BsonBinaryReaderSettings readerSettings, IBsonSerializer serializer, IBsonSerializationOptions serializationOptions)
  at MongoDB.Driver.MongoCursorEnumerator`1.GetReply(MongoConnection connection, MongoRequestMessage message)
  at MongoDB.Driver.MongoCursorEnumerator`1.GetFirst()
  at MongoDB.Driver.MongoCursorEnumerator`1.MoveNext()

如何解决此错误？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Driver;

namespace trader
{
    public class Formula
    {
        public ObjectId _id { get; set; }
        public string name { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {

            MongoClient client = new MongoClient("mongodb://localhost:27017");
            MongoServer server = client.GetServer();
            MongoDatabase db = server.GetDatabase("trader");
            var formulaCollection = db.GetCollection<Formula>("formulas");
            var formulas = formulaCollection.FindAll();
            foreach (var formula in formulas)
            {
                Console.WriteLine(formula.name);
            }
        }
    }
}

这是来自db.formulas.find（{}，{name：1}）

{ "_id" : "9RZuitaJ7uKvrBKbE", "name" : "10d sma" }
{ "_id" : "kjLzXChio8wD2MQcD", "name" : "< 10d mean" }
{ "_id" : "mmjSnHS5L2GztXPLX", "name" : "< 2h mean" }
{ "_id" : "bH5zBEz5CnMFJMnSZ", "name" : "< 2h mean > 0.4 sd2h" }
{ "_id" : "A2joSNeBxPZTJgkGs", "name" : "< 2d mean > 0.4 sd2d" }
{ "_id" : "6jgQvFci3mW5Aijr6", "name" : "< 2d mean > 0.4 sd2d 2h sma" }
{ "_id" : "hHBRtu2nWZiYBdHGq", "name" : "2d sma" }

Answer 1

您可以使用mongo shell从trader.formulas中选择一些示例文档并在此处发布吗？看起来您从node.js app创建的_id不是ObjectId类型

将c＃驱动程序与在node.js中创建的文档一起使用

1 个答案: