codedog codedog - 3 months ago 26
JSON Question

Deserialising nested objects with Json.Net

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
.

Answer

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.