Deserialising nested objects with Json.Net

Question

I am dealing with an API that returns something like this:

{"v1.ProjectList": 
    { 
        "self_link": { "href": "https://central-staged:8880/api/v1/projects", "methods": "GET" }, 
        "items": [], 
        "register": {"href": "https://central-staged:8880/api/v1/projects/register", "methods": "POST"}, 
        "max_active": {"href": "https://central-staged:8880/api/v1/projects/max-active", "methods": "GET"} 
    }
}

I am generating a bunch of DTOs to accommodate the de-serialisation of of that JSON string.

namespace v1
{
    public class Project
    {
        public rest_common.Link branches { get; set; }
        public float coordinate_x { get; set; }
        public float coordinate_y { get; set; }
        public string description { get; set; }
        public int id { get; set; }
        public string location { get; set; }
        public string name { get; set; }
        public rest_common.Link publish_events { get; set; }
        public rest_common.Link self_link { get; set; }
        public rest_common.Link thumbnail { get; set; }
        public System.Guid uuid { get; set; }
    }

    [JsonObject(Title = "v1.ProjectList")]
    public class ProjectList
    {
        public List<Project> items { get; set; }
        public rest_common.Link max_active { get; set; }
        public rest_common.Link register { get; set; }
        public rest_common.Link self_link { get; set; }
    }
}

namespace rest_common
{
    public class Link
    {
        public string href { get; set; }
        public string methods { get; set; }
    }
}

That code was generated from server-side code and I can modify it to suit. The only thing I cannot modify at this time is the JSON response returned by the server.

I am trying to figure out how to deserialise this:

class Program
    {
        static void Main(string[] args)
        {
            var jsonContent = "{\"v1.ProjectList\": {\"self_link\": {\"href\": \"https://something.com/getblah\", \"methods\": \"GET\"}, \"items\": [], \"register\": {\"href\": \"https://something.com/postblah\", \"methods\": \"POST\"}, \"max_active\": {\"href\": \"https://something.com/getblah2\", \"methods\": \"GET\"}}}";
            var projectList = JsonConvert.DeserializeObject<ProjectList>(jsonContent);
            Console.ReadLine();
        }
    }

At the moment projectList is an instance of the correct class, but all its members are null.

You should paste a non-escaped JSON example.

aybe
– aybe

2016-08-24 22:21:06 +00:00
Commented Aug 24, 2016 at 22:21 — aybe
– aybe, Commented Aug 24, 2016 at 22:21

Diego · Accepted Answer · 2016-08-24 22:26:33Z

2

You are trying to deserialize an object that contains a single property named v1.ProjectList. So create such class:

public class ProxyObject
{
    [JsonPropertyAttribute("v1.ProjectList")]
    public ProjectList ProjectList { get; set;}
}

.. And then this works:

var projectList = JsonConvert.DeserializeObject<ProxyObject>(jsonContent).ProjectList;

The attribute [JsonObject(Title = "v1.ProjectList")] is unnecessary.

answered Aug 24, 2016 at 22:26

Diego

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Brinky · Accepted Answer · 2016-08-24 22:37:29Z

0

Alternatively, since you are creating a new instance of the class you are deserializing the string of JSON from, indicate that:

var projectList = new (ProjectList)(JsonConvert.DeserializeObject<ProjectList>(jsonContent));

answered Aug 24, 2016 at 22:37

Brinky

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