C# throws error when interpreting embedded document value of empty array []

Question

Here is the information about my development environment:

MongoDB 3.0.0

MongoDB C# Driver Version 1.7.0.4714

Microsoft Visual Studio Professional 2013

.NET Framework 4.0

Here is a C# Class whose objects will be used as embedded documents:

   public class Location
   {
       public double lng { get; set; }
       public double lat { get; set; }
   }

Here is a C# Class used to represent a person's house:

   public class House
   {
       public String houseDescription { get; set; }
       public Location locOfHouse  { get; set; }
   }

We have a C# API module used by mobile application component that will set the locOfHouse = []

which means that in the MongoDB Collection called House, we could have the following document:

{
  "_id" : ObjectId("56c455ee26b49c090019b439"),
  "houseDescription" : "Multi-floor house with elevator and staircase",   
  "locOfHouse" : []
}

In my C# application, I have the following class mappting to BSON

     if (false == BsonClassMap.IsClassMapRegistered(typeof(House)))
        {
            BsonClassMap.RegisterClassMap<House>(cm =>
            {
                cm.AutoMap();
                cm.MapProperty<Location>(c => (Location)c.locOfHouse);

            });

        }

However, the web-based C# application throws the following error when retrieving the aforementioned data:

An error occurred while deserializing the locOfHouse property of class 
House: Expected a nested document representing the serialized form of a Location 
value, but found a value of type Array instead.

How do I change my C# application code in such a way the it will Not throw the aforementioned error?

Why is the "C# API module" setting locOfHouse to an empty array? That's the broken code - I would initially try to fix that rather than making everything else work around the broken data. — Jon Skeet
– Jon Skeet, Commented Feb 18, 2016 at 8:28
It is handled by a different developer, and he wants me to just handle the empty array in my code. — CS Lewis
– CS Lewis, Commented Feb 18, 2016 at 8:30
You should agree on a data model. If the model is that locOfHouse is meant to be a single value, the other developer should change their code. If the model is that locOfHouse should be a collection (which seems very odd to me), you should change your House class. Trying to maintain two incompatible data models is a recipe for pain. — Jon Skeet
– Jon Skeet, Commented Feb 18, 2016 at 8:34

Fatih Erol · Accepted Answer · 2018-03-10 01:11:43Z

1

Change with List

public Location locOfHouse  { get; set; }

to

public List<Location> locOfHouse  { get; set; }

edited Mar 10, 2018 at 1:11

answered Mar 10, 2018 at 1:05

Fatih Erol

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