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Dynamics 365 Community / Forums / Finance | Project Operations, Human Resources, ... / JSON serialization of ...
Finance | Project Operations, Human Resources, ...
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JSON serialization of a class that contains a list/array of objects of another class in X++

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Posted on by Ascalab 30

As the subject suggests, I am trying to do the JSON serialization of an object, an instance of a class that, among other properties, has a list or array (I don't know what's better, that could be another question) of objects, instances of another class. Basically, my main class is of a header-details type. When I try JSON serialization using Newtonsoft.Json.JsonConvert::SerializeObject method, the main object is serialized correctly, but its Details property is empty in the JSON. What am I missing or doing wrong?

  • Ascalab Profile Picture
    Ascalab 30 on at
    RE: JSON serialization of a class that contains a list/array of objects of another class in X++

    I have implemented it the way you suggested, but the output was still empty details list. I eventually found a solution that looks a bit silly, but it worked. I found it on another thread of this forum, and it was posted by the user M.K. It's not marked as a verified answer, but it worked for me (and for another member of the mentioned discussion). The command that worked is:

    str formatedJSON = JsonConvert::SerializeObject(JsonConvert::DeserializeObject(FormJsonSerializer::serializeClass(object)), Formatting::Indented);

    So the object was first serialized using FormJsonSerializer, and then deserialized and serialized again using Newtonsoft's JsonConvert class.

  • Suggested answer
    Anton Venter Profile Picture
    Anton Venter 19,457 Super User 2024 Season 2 on at
    RE: JSON serialization of a class that contains a list/array of objects of another class in X++

    To serialize correctly as children of the parent, the child objects must be contained in a class member variable like a List for example and be exposed properly (method must be decorated as such). Below is an untested example just to demonstrate what I mean. I use the FormJsonSerializer class to serialize/deserialize but the NewtonSoft library should work as well. If you search online for FormJsonSerializer, you will find some alternative examples.

    public class MyHeaderClass
{
	protected List childrenList;

    [DataMemberAttribute('Lines'), DataCollectionAttribute(Types::Class, classStr(MyLineClass))]
    public List parmChildren(List _childrenList = childrenList)
    {
        childrenList = _childrenList;
        return childrenList;
    }
}

  • Bharani Preetham Peraka Profile Picture
    Bharani Preetham Pe... 3,587 Super User 2024 Season 1 on at
    RE: JSON serialization of a class that contains a list/array of objects of another class in X++

    Empty means either your details list is null completely. Means you did not implement the details class. Can you send the parm method for this class?

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