Json result returns Array of objects some times and a single object if single record exists

Question

Json result returns Array of objects some times and a single object if single record exists.so i want to Parse the json result to my model class which is a list,so if json returns an array then its working fine..if it is a single object i m getting this error..

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Chefsportalen.Models.JsonObjectModels.ListDevicesByLabelModel+Device]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.

Path 'devices.device.@id', line 1, position 90.

public class listAllAppsModelcs
{
    public string deviceUuid { get; set; }
    public List<App> clientApps { get; set; }
    public class App
    {
        public string @id { get; set; }
        public string appName { get; set; }
        public string assetName { get; set; }
        public string bundle { get; set; }
        public int inventoryAppId { get; set; }
        public string platform { get; set; }
        public object reportedAppName { get; set; }
        public string type { get; set; }
        public object version { get; set; }
    }
    public class Apps
    {
        public List<App> clientApp { get; set; }

    }
}

this is my model class..

and my json responce is this

{
    "deviceUuid": "dd77202b-ec50-4c0b-95d3-8c742d171d31",
    "clientApps": {
        "clientApp": {
            "@id": "203131",
            "appName": "MobileIron 6.2",
            "assetName": "MobileIron 6.2",
            "bundle": "com.mobileiron.phoneatwork",
            "inventoryAppId": 6085,
            "platform": "iOS 8.1",
            "reportedAppName": "MobileIron",
            "type": "APPLICATION",
            "version": 6.2
        }
    }
}

Please Help me in fixing this issue..any help will be appriciated..thanks..

Show some source code, would really help in diagnosing your problem. Specifically, show the javascript and methods that are involved in this process that is showing the error — Pseudonym, Apr 03 '15 at 12:39
possible duplicate of [How to handle both a single item and an array for the same property using JSON.net](http://stackoverflow.com/questions/18994685/how-to-handle-both-a-single-item-and-an-array-for-the-same-property-using-json-n) — har07, Apr 03 '15 at 13:03

Pharylon · Answer 1 · 2015-04-03T13:43:37.063

Check your error. When you get a single item and try to deserialize it into a list, the error starts with Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List

You have an unreliable JSON object. Maybe it'll be a list, maybe not. But you don't know that at runtime. That means you're going to need to do it dynamically. Json.NET can do this for you by deserialializing it into a dynamic object.

public static void Run()
{
    string[] jsons = { "[1, 2, 3]", "1" };


    foreach (var json in jsons)
    {

        List<int> myInts;

        dynamic d = JsonConvert.DeserializeObject(json);
        if (d is IEnumerable)
        {
            myInts = JsonConvert.DeserializeObject<List<int>>(json);
        }
        else
        {
            myInts = new List<int> {JsonConvert.DeserializeObject<int>(json)};
        }
        foreach (var myInt in myInts)
        {
            Console.Write(myInt);
        }
        Console.WriteLine();
    }
}

The above will print 123 1

We've now handled a situation where the JSON could be a list of ints or a single int by deserializing dynamically first and checking if it was a list.

score 0 · Answer 2 · answered Apr 03 '15 at 13:25

There is a really nice tool http://json2csharp.com/ that converts JSON objects to C# classes.

Your JSON object should look like this in C#

public class ClientApp
{
    public string __invalid_name__@id { get; set; }
    public string appName { get; set; }
    public string assetName { get; set; }
    public string bundle { get; set; }
    public int inventoryAppId { get; set; }
    public string platform { get; set; }
    public string reportedAppName { get; set; }
    public string type { get; set; }
    public double version { get; set; }
}

public class ClientApps
{
    public ClientApp clientApp { get; set; }
}

public class RootObject
{
    public string deviceUuid { get; set; }
    public ClientApps clientApps { get; set; }
}

Json result returns Array of objects some times and a single object if single record exists

2 Answers2