Using JsonConvert.DeserializeObject() for Gremlin.net ResultSet, object properties are null or empty (c#)

Question

Using Gremlin.Net (3.4.6) and CosmosDB/Graph Upon query, ResultSet of dynamic type is serialized. It is thereafter deserialized to a specific List<> of type Person. Basic vertex values are there, however, the properties' values are empty. I've tried various solutions (including using a Wrapper) without success (the Person objects are null). Using JSON property attribute makes no difference.

Gremlin.Net.Driver.ResultSet<dynamic> result = await ExecuteQuery();
string pList = JsonConvert.SerializeObject(result);     
List<Person> people = JsonConvert.DeserializeObject<List<Person>>(pList);

The pList looks like this: Note that properties members have values in the JSON

Person class is defined as:

public class Person : VertexBase
    {
        [JsonProperty("Name")]
        public VertexProperty<string, NameMeta> Name { get; set; }       
        public string[] PhoneNumbers { get; set; }    
        public int Age { get; set; }

        public Person()
        {         

        }

    }

What is the right way of doing this? Surely it should be something reasonably simple to get at the nested dictionary of properties. The examples do not show deserialization.

Banya Banya · Accepted Answer · 2021-04-09T07:54:27

I faced a similar problem, and I worked around it by explicitly adding a member to my class (Person class in your case) that would contain the Properties dictionary:

    public class PropertyKeyValuePair
    {
        public string Id;
        public string Value;
    }

    public class Person
    {
        // Other fields
        // ...
        public Dictionary<string, PropertyKeyValuePair[]> properties;
    }

The JsonConvert.DeserializeObject function now should be able to deserialize the properties into the properties member.

Using JsonConvert.DeserializeObject() for Gremlin.net ResultSet, object properties are null or empty (c#)

1 Answers