Json nested objects and how to use with ObservableCollection<>

Question

I'm working in Xamarin and have a nested json object (which is a list of items starting at "message") that I need to add to an ObservableCollection, but I'm having trouble assigning it to the collection. The data is getting retrieved fine, but I keep getting this error:

cannot convert from 'RequestorPerformer.Models.BaseVenue[]' to 'System.Collections.Generic.IEnumerable<RequestorPerformer.Models.Rootobject>'

The model:

   public class BaseVenue 
    {
        public int Id { get; set; }            
        public string VenueName { get; set; }
        public string VenueAddress { get; set; }
        public string ShowDate { get; set; }  
        public string ShowTime { get; set; }        
        public string Description { get; set; }
    }


    public class Rootobject
    {
        public bool Error { get; set; }
        public int ErrorCode { get; set; }
        public BaseVenue[] Message { get; set; }
    }

The code (the line, "_posts = new ..." is where I'm getting the error) :

private ObservableCollection<Rootobject> _posts;
var posts = JsonConvert.DeserializeObject<Rootobject>(returnResponse);
_posts = new ObservableCollection<Rootobject>(posts.Message);

The data (what's in returnResponse):

{
    "error": false,
    "errorCode": 0,
    "message": [{
        "id": "93",
        "venueName": "Sushi Kuni",
        "venueAddress": "10211 S De Anza Blvd Cupertino CA",
        "showDate": "1531022400",
        "showTime": "",
        "description": ""
    }, {
        "id": "38",
        "venueName": "Two Keys Tavern",
        "venueAddress": "333 S Limestone Lexington KY",
        "showDate": "1531368000",
        "showTime": "8 pm - 1 am",
        "description": ""
    }, {
        "id": "39",
        "venueName": "Two Keys Tavern",
        "venueAddress": "333 S Limestone Lexington KY",
        "showDate": "1531454400",
        "showTime": "8 pm - 2 am",
        "description": ""
    }]
}

Even if I remove the posts.Message and just make it post I get the same basic error message:

cannot convert from 'RequestorPerformer.Models.Rootobject' to 'System.Collections.Generic.IEnumerable<RequestorPerformer.Models.Rootobject>'

Thank you in advance,

Robert

Answer 1

Hello,

Welcome to Microsoft Q&A!

We should make the variable type same as the generic T type passed when calling JsonConvert.DeserializeObject() .

T = JsonConvert.DeserializeObject<T>() ;

Change your code as below .

   private Rootobject posts;  
   var posts = JsonConvert.DeserializeObject<Rootobject>(returnResponse);  
   BaseVenue[] Message = posts.Message ;  

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