MongoDB.Bson.Serialization.BsonDefaultSerializationProvider.GetSerializer C# (CSharp) Метод

        public IBsonSerializer GetSerializer(Type type)
        {
            Type serializerType;
            if (__serializers.TryGetValue(type, out serializerType))
            {
                return (IBsonSerializer)Activator.CreateInstance(serializerType);
            }

            // use BsonDocumentSerializer for all subclasses of BsonDocument also
            if (typeof(BsonDocument).IsAssignableFrom(type))
            {
                return BsonDocumentSerializer.Instance;
            }

            // use BsonIBsonSerializableSerializer for all classes that implement IBsonSerializable
            if (typeof(IBsonSerializable).IsAssignableFrom(type))
            {
                return BsonIBsonSerializableSerializer.Instance;
            }

            if (type.IsGenericType)
            {
                var genericTypeDefinition = type.GetGenericTypeDefinition();
                Type genericSerializerDefinition;
                if (__genericSerializerDefinitions.TryGetValue(genericTypeDefinition, out genericSerializerDefinition))
                {
                    var genericSerializerType = genericSerializerDefinition.MakeGenericType(type.GetGenericArguments());
                    return (IBsonSerializer)Activator.CreateInstance(genericSerializerType);
                }
            }

            if (type.IsArray)
            {
                var elementType = type.GetElementType();
                switch (type.GetArrayRank())
                {
                    case 1:
                        var arraySerializerDefinition = typeof(ArraySerializer<>);
                        var arraySerializerType = arraySerializerDefinition.MakeGenericType(elementType);
                        return (IBsonSerializer)Activator.CreateInstance(arraySerializerType);
                    case 2:
                        var twoDimensionalArraySerializerDefinition = typeof(TwoDimensionalArraySerializer<>);
                        var twoDimensionalArraySerializerType = twoDimensionalArraySerializerDefinition.MakeGenericType(elementType);
                        return (IBsonSerializer)Activator.CreateInstance(twoDimensionalArraySerializerType);
                    case 3:
                        var threeDimensionalArraySerializerDefinition = typeof(ThreeDimensionalArraySerializer<>);
                        var threeDimensionalArraySerializerType = threeDimensionalArraySerializerDefinition.MakeGenericType(elementType);
                        return (IBsonSerializer)Activator.CreateInstance(threeDimensionalArraySerializerType);
                    default:
                        var message = string.Format("No serializer found for array for rank {0}.", type.GetArrayRank());
                        throw new BsonSerializationException(message);
                }
            }

            if (type.IsEnum)
            {
                return new EnumSerializer();
            }

            // classes that implement IDictionary or IEnumerable are serialized using either DictionarySerializer or EnumerableSerializer
            // this does mean that any additional public properties the class might have won't be serialized (just like the XmlSerializer)
            var collectionSerializer = GetCollectionSerializer(type);
            if (collectionSerializer != null)
            {
                return collectionSerializer;
            }

            // we'll try our best by attempting to find a discriminator hoping it points
            // us to a concrete type with a serializer.
            if (type.IsInterface)
            {
                return InterfaceSerializer.Instance;
            }

            return null;
        }