Deserialize json string to object c#.net

Question

I have a JSON string which needs to be deserialized into an object.

This is what I have tried :

Class :

public class trn
{
    public string visited_date { get; set; }
    public string party_code { get; set; }
    public string response { get; set; }
    public string response_type { get; set; }
    public string time_stamp { get; set; }
    public string trans_id { get; set; }
    public double total_amount { get; set; }
    public double discount { get; set; }
}

json string :

string json = "{\"trn\":{\"visited_date\":\"2015-04-05\",\"party_code\":\"8978a1bf-c88b-11e4-a815-00ff2dce0943\",\"response\":\"Reason 5\",\"response_type\":\"NoOrder\",\"time_stamp\":\"2015-04-05 18:27:42\",\"trans_id\":\"8e15f00b288a701e60a08f968a42a560\",\"total_amount\":0.0,\"discount\":0.0}}";

trn model2 = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<trn>(json);

and using json.net

trn model = JsonConvert.DeserializeObject<trn>(json);

but all the properties are initialized with null values.

check out http://stackoverflow.com/questions/6201529/turn-c-sharp-object-into-a-json-string-in-net-4 — Birkan AYDIN, Apr 05 '15 at 17:08

score 6 · Accepted Answer · answered Apr 05 '15 at 16:56

Your JSON represents an object with trn as a property within another object. So you need to represent that in your code, as well. For example:

using System;
using System.IO;
using Newtonsoft.Json;

public class Transaction
{
    [JsonProperty("visited_date")]
    public DateTime VisitedDate { get; set; }
    [JsonProperty("party_code")]
    public string PartyCode { get; set; }
    [JsonProperty("response")]
    public string Response { get; set; }
    [JsonProperty("response_type")]    
    public string ResponseType { get; set; }
    [JsonProperty("time_stamp")]
    public DateTime Timestamp { get; set; }
    [JsonProperty("trans_id")]
    public string TransactionId { get; set; }
    [JsonProperty("total_amount")]    
    public double TotalAmount { get; set; }
    [JsonProperty("discount")]
    public double Discount { get; set; }
}

public class TransactionWrapper
{
    [JsonProperty("trn")]
    public Transaction Transaction { get; set; }
}

class Test
{
    static void Main(string[] args)
    {
        string json = "{\"trn\":{\"visited_date\":\"2015-04-05\",\"party_code\":\"8978a1bf-c88b-11e4-a815-00ff2dce0943\",\"response\":\"Reason 5\",\"response_type\":\"NoOrder\",\"time_stamp\":\"2015-04-05 18:27:42\",\"trans_id\":\"8e15f00b288a701e60a08f968a42a560\",\"total_amount\":0.0,\"discount\":0.0}}";
        var wrapper = JsonConvert.DeserializeObject<TransactionWrapper>(json);
        Console.WriteLine(wrapper.Transaction.PartyCode);
    }
}

Note how I've used the [JsonProperty] attribute to allow the property names themselves to be idiomatic for .NET, but the JSON property names to still be used appropriately. I've also changed the types of Transaction and VisitedDate. Finally, it's slightly alarming that total_amount and discount are double values - that's really not suitable for currency values. Unfortunately, you may not be able to control that.

score 1 · Answer 2 · answered Apr 05 '15 at 17:00

Yes, as @InvernoMuto says, your JSON string is an object with a nested object property, the inner object is the trn object. Your JSON string would need to be something like this to work:

string json = "{\"visited_date\":\"2015-04-05\",\"party_code\":\"8978a1bf-c88b-11e4-a815-00ff2dce0943\",\"response\":\"Reason 5\",\"response_type\":\"NoOrder\",\"time_stamp\":\"2015-04-05 18:27:42\",\"trans_id\":\"8e15f00b288a701e60a08f968a42a560\",\"total_amount\":0.0,\"discount\":0.0}";

I think Jon's answer is far more definitive however.

ale · Answer 3 · 2015-04-05T17:15:28.157

Your JSON is a Dictionary<string,trn>, try yourself in this Fiddle

using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;



public class Program
{

    public static void Main()
    {
        string json = "{\"trn\":{\"visited_date\":\"2015-04-05\",\"party_code\":\"8978a1bf-c88b-11e4-a815-00ff2dce0943\",\"response\":\"Reason 5\",\"response_type\":\"NoOrder\",\"time_stamp\":\"2015-04-05 18:27:42\",\"trans_id\":\"8e15f00b288a701e60a08f968a42a560\",\"total_amount\":0.0,\"discount\":0.0}}";

        var p = JsonConvert.DeserializeObject<Dictionary<string,trn>>( json );



        Console.WriteLine(p["trn"].party_code);
    }
    public class trn
    {
        public string visited_date { get; set; }
        public string party_code { get; set; }
        public string response { get; set; }
        public string response_type { get; set; }
        public string time_stamp { get; set; }
        public string trans_id { get; set; }
        public double total_amount { get; set; }
        public double discount { get; set; }
    }


}

Deserialize json string to object c#.net

3 Answers3