mongodb-csharp-driver ignore if empty attribute

[Jentor]

Current serialization implementation always adds new array item into
final result when serializing IEnumerable items, even if array is
empty (but not null). Is it possible to write custom attribute
IgnoreIfEmpty ? Or should I write my own IgnoreIfNull convention,
which would check whether item.Count == 0? If so, can you please help
me with that. Thanks.

[craiggwilson]

Yes, looks like that convention is probably named inappropriately.  It should probably be IIgnoreConvention.  Regardless, that is the place you can hook in to indicate that you don't want to serialize empty elements.

[Alex Brown]

I'm also looking for this...

Could you submit a patch?

[craiggwilson]

I'm sorry, Alex, but what are you looking for?

[Alex Brown]

Looking for a way of ignoring empty IEnumerables... so they don't get serialized.

[craiggwilson]

I don't believe there is currently a way to do this.  If you need this functionality, file a jira at jira.mongodb.org and we'll look at it and prioritize.

[craiggwilson]

Alex, Robert had another suggestion.  For each property, we look for a method called ShouldSerializeXXX, where XXX is your property name.  You can return true or false here as to whether or not to serialize the value.

public class Person

{

   //...

   public IEnumerable<string> Addresses { get; set; }

   private bool ShouldSerializeAddresses()

   {

       return Addresses.Count() > 0;

[Alex Brown]

Using your example of Person / Addresses, I used the following, which works:

            BsonClassMap.RegisterClassMap<Person>(cm =>

            {

                cm.AutoMap();

                cm.GetMemberMap(c => c.CompetitorBests)

                    .SetShouldSerializeMethod(

                        obj => ((Person)obj).Addresses.Any());

            });

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[Dotnet Developer_C]

May I please know where should we write the BsonClassMap.RegisterClassMap .....................................etc. If I write in my .cs file(which is a model file in mvc) Visual studio is giving me a red squiggle saying that its used as a type instead BsonClassMap.Regis....is a method.

 public class class_name

    {

        public int xxx { get; set; }

        public string xxxx { get; set; }

        public List<string> ABC{ get; set; }

        private bool ShouldSerializeABC()

        {

            return ABC.Count() > 0;

        }

      

       BsonClassMap.RegisterClassMap<class_name>(cm=>

    {

    cm.AutoMap();

         cm.GetMemberMap(c => c.CompetitorBests)

                    .SetShouldSerializeABC(

                        obj => ((class_name)obj).ABC.Any());

    

    }