JSONConvert.DeserializeObject not handling child array with unnamed array items

Question

I have the following JSON object coming to me from a web service

{
   "room":{
      "name":"Thunderdome",
      "created_at":"2012/04/15 00:36:27 +0000",
      "id":xxxxxxx,
      "users":[
         {
            "type":"Member",
            "avatar_url":"url",
            "created_at":"2012/02/27 14:11:57 +0000",
            "id":1139474,
            "email_address":"[email protected]",
            "admin":false,
            "name":"xxxx xxxxx"
         },
         {
            "type":"Member",

etc

I'm using the following line to deserialize:

var room = JsonConvert.DeserializeObject<SingleRoom>(text);

And the following mapping classes

public class SingleRoom
{
    public Room Room { get; set; }
}

[DataContract]
public class Room
{
    [DataMember]
    public int Id { get; set; }
    [DataMember]
    public string Name { get; set; }
    public string Image {
        get { return "Assets/campfire.png"; }
    }
    [DataMember]
    public string Topic { get; set; }
    [DataMember(Name ="membership_limit")]
    public int MembershipLimit { get; set; }
    [DataMember]
    public bool Full { get; set; }
    [DataMember]
    public bool Locked { get; set; }
    [DataMember(Name = "open_to_guests")]
    public bool OpenToGuests { get; set; }
    [DataMember(Name = "updated_at")]
    public DateTime UpdatedAt { get; set; }
    [DataMember(Name = "created_at")]
    public DateTime CreatedAt { get; set; }

    [DataMember(Name = "active_token_value")]
    public string ActiveTokenValue { get; set; }

     [DataMember(Name = "Users")]
    public List<User> Users { get; set; } 
}

[DataContract]
public class User
{
    [DataMember]
    public int Id { get; set; }
    [DataMember]
    public string Name { get; set; }

    [DataMember(Name = "email_address")]
    public string EmailAddress { get; set; }
    [DataMember]
    public bool Admin { get; set; }
    [DataMember]
    public DateTime CreatedAt { get; set; }
    [DataMember]
    public string Type { get; set; }

    [DataMember(Name = "avatar_url")]
    public string AvatarUrl { get; set; }
}

The 'Room' object deserializes correctly but the Users property on the Room is always null. I know that a null result is the result of a JSON.NET serialization that couldn't find the matching property. However, I think I have it right? List should match to user. I know the array object users in the JSON doesn't have named children, is that the issue? If so, how do I solve it?

Thanks!

Have you tried by lower casing Users in [DataMember(Name = "Users")] — L.B
– L.B, Commented Dec 10, 2013 at 16:29
Sorry without knowing the complete json, we can not help you more — L.B
– L.B, Commented Dec 10, 2013 at 22:08
Complete JSON here: gist.github.com/edgiardina/6d20d9c4af5e1e54af4f — Richthofen
– Richthofen, Commented Dec 10, 2013 at 22:29

L.B · Accepted Answer · 2013-12-10 22:47:07Z

4

This works.... You can rename them (or use JsonProperty attribute) to use c# style property names

(BTW: Json.Net doesn't require DataMember, DataContract attributes)

var obj = JsonConvert.DeserializeObject<SingleRoom>(json)

public class User
{
    public string type { get; set; }
    public string avatar_url { get; set; }
    public string email_address { get; set; }
    public bool admin { get; set; }
    public string name { get; set; }
    public string created_at { get; set; }
    public int id { get; set; }
}

public class Room
{
    public string topic { get; set; }
    public int membership_limit { get; set; }
    public bool locked { get; set; }
    public string name { get; set; }
    public List<User> users { get; set; }
    public bool full { get; set; }
    public bool open_to_guests { get; set; }
    public string updated_at { get; set; }
    public string created_at { get; set; }
    public int id { get; set; }
}

public class SingleRoom
{
    public Room room { get; set; }
}

PS: You may find that site useful http://json2csharp.com/ .

edited Dec 10, 2013 at 22:47

answered Dec 10, 2013 at 22:38

L.B

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1 Comment

Richthofen Over a year ago

that URL is pretty damn awesome. I lowercased the users property and it works. I don't know why the DataMember hint wasn't picked up. JSON.Net is supposed to support them.

Erdogan · Accepted Answer · 2022-04-12 21:04:16Z

0

In my case, I had missing to add the "public" key for the child property.

answered Apr 12, 2022 at 21:04

Erdogan

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