MongoDB.Bson.Serialization.Serializers.EnumerableSerializer.CreateInstance C# (CSharp) Метод

        protected override object CreateInstance(Type actualType)
        {
            string message;

            if (actualType.IsInterface)
            {
                // in the case of an interface pick a reasonable class that implements that interface
                if (actualType == typeof(IEnumerable) || actualType == typeof(ICollection) || actualType == typeof(IList))
                {
                    return new ArrayList();
                }
            }
            else
            {
                if (actualType == typeof(ArrayList))
                {
                    return new ArrayList();
                }
                else if (typeof(IEnumerable).IsAssignableFrom(actualType))
                {
                    var instance = Activator.CreateInstance(actualType);
                    var list = instance as IList;
                    if (list == null)
                    {
                        message = string.Format("Enumerable class {0} does not implement IList so it can't be deserialized.", BsonUtils.GetFriendlyTypeName(actualType));
                        throw new BsonSerializationException(message);
                    }
                    return list;
                }
            }

            message = string.Format("EnumerableSerializer can't be used with type {0}.", BsonUtils.GetFriendlyTypeName(actualType));
            throw new BsonSerializationException(message);
        }