c# How can I map an Array object property to a Mongodb BsonType.Array

Question

I have the following object in my models:

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

[BsonElement("Name")]
[BsonRepresentation(BsonType.String)]
public string Name { get; set; }

[BsonElement("Price")]
[BsonRepresentation(BsonType.Double)]
public double Price { get; set; }

[BsonElement("Type")]
[BsonRepresentation(BsonType.Array)]
public string[] Type { get; set; }

when I try to insert a new object to the database using =>

MongoCollection.InsertOne(object);

the following error occurs

System.TypeInitializationException: The type initializer for 'OrdisTT.Libs.MongoLib' threw an exception.
 ---> System.ArgumentException: GenericArguments[0], 'System.Array', on 'MongoDB.Bson.Serialization.Serializers.EnumerableInterfaceImplementerSerializer`1[TValue]' violates the constraint of type 'TValue'.
 ---> System.TypeLoadException: GenericArguments[0], 'System.Array', on 'MongoDB.Bson.Serialization.Serializers.EnumerableInterfaceImplementerSerializer`1[TValue]' violates the constraint of type parameter 'TValue'.
   at System.RuntimeTypeHandle.Instantiate(Type[] inst)
   at System.RuntimeType.MakeGenericType(Type[] instantiation)
   --- End of inner exception stack trace ---

How can I map an array property to a mongodb array?

Can you check if the .NET side type is List<string> if it's working? — ntohl
– ntohl, Commented Nov 12, 2019 at 9:27
github.com/mongodb/mongo-csharp-driver/blob/… looks like arrays are represented as strings in the tests ([BsonRepresentation(BsonType.String)]) — ntohl
– ntohl, Commented Nov 12, 2019 at 9:53

YaRmgl · Accepted Answer · 2022-10-23 04:04:28Z

3

If I just make the field or property like this:

public List<string> SomeList = new List<string>();

it will map, no need for representation.

edited Oct 23, 2022 at 4:04

answered Nov 10, 2019 at 18:13

YaRmgl

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