Deserializing JSON response consisting of list of objects into C# class
Question
I'm working with NewsBlur API which returns a feed list. The response JSON is of type:
{
"authenticated": true,
"user": "sathyabhat",
"feeds": {},
"flat_folders": { },
result: "ok"
}
where feeds: is of type
"feeds": {
"96705": {
"feed_address": "http://www.linuxhaxor.net/",
"updated": "8492 hours",
"favicon_text_color": null,
"subs": 35,
"feed_link": "http://www.linuxhaxor.net/",
"favicon_fetching": true,
"nt": 0,
"updated_seconds_ago": 30573336,
"num_subscribers": 35,
"feed_title": "LinuxHaxor.net",
"favicon_fade": null,
"exception_type": "feed",
"exception_code": 503,
"favicon_color": null,
"active": true,
"ng": 0,
"feed_opens": 0,
"id": 96705,
"ps": 0,
"has_exception": true
},
"768840": {
"feed_address": "http://feeds.feedburner.com/PathikShahDotCom",
"updated": "3 hours",
"favicon_text_color": "black",
"subs": 1,
"feed_link": "http://www.pathikshah.com/blog",
"favicon_fetching": false,
"nt": 0,
"updated_seconds_ago": 13043,
"num_subscribers": 1,
"feed_title": "Pathik Shah",
"favicon_fade": "769456",
"favicon_color": "b2d092",
"active": true,
"ng": 0,
"feed_opens": 0,
"id": 768840,
"ps": 0
},
"768842": {
"feed_address": "http://feeds.preshit.net/preshit/blog",
"updated": "3 hours",
"favicon_text_color": null,
"subs": 1,
"feed_link": "http://preshit.net",
"favicon_fetching": false,
"nt": 3,
"updated_seconds_ago": 13536,
"num_subscribers": 1,
"feed_title": "Preshit Deorukhkar",
"favicon_fade": null,
"favicon_color": null,
"active": true,
"ng": 0,
"feed_opens": 1,
"id": 768842,
"ps": 0
},
"768843": {
"feed_address": "http://quizwith.net/feed/",
"updated": "3 hours",
"favicon_text_color": "white",
"subs": 1,
"feed_link": "http://quizwith.net",
"favicon_fetching": false,
"nt": 0,
"updated_seconds_ago": 11617,
"num_subscribers": 1,
"feed_title": "quizwith.net",
"favicon_fade": "c22900",
"favicon_color": "fe6501",
"active": true,
"ng": 0,
"feed_opens": 0,
"id": 768843,
"ps": 0
}
[... so on ..]
}
So essentially, it's a list of feeds objects. Now, I'm trying to deserialize this into a C# object using JSON.net , but my class members are populated with null values.
My class is modelled on the response that I'm getting:
public class FeedResponse
{
public string authenticated { get; set; }
public string user { get; set; }
public List<feed> feeds { get; set; }
public string flat_folders { get; set; }
public string result { get; set; }
}
public class feed
{
public string feed_address { get; set; }
public string updated { get; set; }
public string favicon_text_color { get; set; }
public int subs { get; set; }
public string feed_link { get; set; }
public bool favicon_fetching { get; set; }
public string nt { get; set; }
public string updated_seconds_ago { get; set; }
public int num_subscribers { get; set; }
public string feed_title { get; set; }
public string favicon_fade { get; set; }
public string exception_type { get; set; }
public string exception_code { get; set; }
public string favicon_color { get; set; }
public bool active { get; set; }
public string ng { get; set; }
public int feed_opens { get; set; }
public int id { get; set; }
public bool has_exception { get; set; }
}
This is the line which attempts to deserialize( using RestSharp):
return Execute<FeedResponse>(request);
Evidently, something goes wrong while trying to parse the JSON for the feed response.
Any pointers as to what I'm doing wrong?
3 answers
solution1
5 ACCPTED 2011-12-09 15:41:53
Feeds is a Dictionary<int,Feed> not a List<Feed> (theres is Keys).
edit: a little more details, a list of objects in json would look like that:
[{ name: 'elem1'},
{ name: 'elem2'},
{ name: 'elem3'}]
edit2: full sample working:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Script.Serialization;
namespace JSON {
class Program
{
static void Main(string[] args)
{
var json = @"{
""authenticated"": true,
""user"": ""sathyabhat"",
""feeds"": {
""96705"": {
""feed_address"": ""http://www.linuxhaxor.net/"",
""updated"": ""8492 hours"",
""favicon_text_color"": null,
""subs"": 35,
""feed_link"": ""http://www.linuxhaxor.net/"",
""favicon_fetching"": true,
""nt"": 0,
""updated_seconds_ago"": 30573336,
""num_subscribers"": 35,
""feed_title"": ""LinuxHaxor.net"",
""favicon_fade"": null,
""exception_type"": ""feed"",
""exception_code"": 503,
""favicon_color"": null,
""active"": true,
""ng"": 0,
""feed_opens"": 0,
""id"": 96705,
""ps"": 0,
""has_exception"": true
},
""768840"": {
""feed_address"": ""http://feeds.feedburner.com/PathikShahDotCom"",
""updated"": ""3 hours"",
""favicon_text_color"": ""black"",
""subs"": 1,
""feed_link"": ""http://www.pathikshah.com/blog"",
""favicon_fetching"": false,
""nt"": 0,
""updated_seconds_ago"": 13043,
""num_subscribers"": 1,
""feed_title"": ""Pathik Shah"",
""favicon_fade"": ""769456"",
""favicon_color"": ""b2d092"",
""active"": true,
""ng"": 0,
""feed_opens"": 0,
""id"": 768840,
""ps"": 0
},
""768842"": {
""feed_address"": ""http://feeds.preshit.net/preshit/blog"",
""updated"": ""3 hours"",
""favicon_text_color"": null,
""subs"": 1,
""feed_link"": ""http://preshit.net"",
""favicon_fetching"": false,
""nt"": 3,
""updated_seconds_ago"": 13536,
""num_subscribers"": 1,
""feed_title"": ""Preshit Deorukhkar"",
""favicon_fade"": null,
""favicon_color"": null,
""active"": true,
""ng"": 0,
""feed_opens"": 1,
""id"": 768842,
""ps"": 0
},
""768843"": {
""feed_address"": ""http://quizwith.net/feed/"",
""updated"": ""3 hours"",
""favicon_text_color"": ""white"",
""subs"": 1,
""feed_link"": ""http://quizwith.net"",
""favicon_fetching"": false,
""nt"": 0,
""updated_seconds_ago"": 11617,
""num_subscribers"": 1,
""feed_title"": ""quizwith.net"",
""favicon_fade"": ""c22900"",
""favicon_color"": ""fe6501"",
""active"": true,
""ng"": 0,
""feed_opens"": 0,
""id"": 768843,
""ps"": 0
}
},
""flat_folders"": { },
result: ""ok"" }";
var jsonSerializer = new JavaScriptSerializer();
var response = jsonSerializer.Deserialize<FeedResponse(json);
Console.Write(jsonSerializer.Serialize(response));
Console.ReadKey();
}
}
public class FeedResponse
{
public bool authenticated { get; set; }
public string user { get; set; }
public Dictionary<string,feed> feeds { get; set; }
public object flat_folders { get; set; }
public string result { get; set; }
}
public class feed
{
public string feed_address { get; set; }
public string updated { get; set; }
public string favicon_text_color { get; set; }
public int subs { get; set; }
public string feed_link { get; set; }
public bool favicon_fetching { get; set; }
public string nt { get; set; }
public string updated_seconds_ago { get; set; }
public int num_subscribers { get; set; }
public string feed_title { get; set; }
public string favicon_fade { get; set; }
public string exception_type { get; set; }
public string exception_code { get; set; }
public string favicon_color { get; set; }
public bool active { get; set; }
public string ng { get; set; }
public int feed_opens { get; set; }
public int id { get; set; }
public bool has_exception { get; set; }
} }
solution2
1 2011-12-09 20:24:16
Use a jsonreader, using json.net, your example should look like this:
public class Feeds
{
public bool authenticated;
public string user;
public Dictionary<string, Feed> feeds;
public void ReadJson(JsonReader reader)
{
while (reader.Read())
{
if (reader.TokenType == JsonToken.EndObject)
break;
if (reader.TokenType == JsonToken.PropertyName && (string)reader.Value == "authenticated")
{
reader.Read();
authenticated = (bool)reader.Value;
}
else if (reader.TokenType == JsonToken.PropertyName && (string)reader.Value == "user")
{
reader.Read();
user = (string)reader.Value;
}
else if (reader.TokenType == JsonToken.PropertyName && (string)reader.Value == "feeds")
{
feeds = new Dictionary<string, Feed>();
while (reader.Read())
{
if (reader.TokenType == JsonToken.EndObject)
break;
if (reader.TokenType == JsonToken.PropertyName)
{
string key = (string)reader.Value;
feeds.Add(key, Feed.ReadFromJson(reader));
}
}
}
}
}
public static Feeds ReadFromJson(Stream stream)
{
using (StreamReader sr = new StreamReader(stream))
{
using (Newtonsoft.Json.JsonReader jsonReader = new Newtonsoft.Json.JsonTextReader(sr))
{
Feeds feeds = new Feeds();
feeds.ReadJson(jsonReader);
return feeds;
}
}
}
}
public class Feed
{
public string feed_address;
public string updated;
public void ReadJson(JsonReader reader)
{
while (reader.Read())
{
if (reader.TokenType == JsonToken.EndObject)
break;
if (reader.TokenType == JsonToken.PropertyName && (string)reader.Value == "feed_address")
{
reader.Read();
feed_address = (string)reader.Value;
}
else if (reader.TokenType == JsonToken.PropertyName && (string)reader.Value == "updated")
{
reader.Read();
updated = (string)reader.Value;
}
}
}
public static Feed ReadFromJson(JsonReader reader)
{
Feed feed = new Feed();
feed.ReadJson(reader);
return feed;
}
}
solution3
1 2011-12-09 23:57:14
Since your returned Json string contains names like 96705,768840,768842,768843 which are not valid c# variable names, you can not deserialize your string to a class unless you use a dictionary for feeds . So, if accessing some of the properties of your object as dict["key"] is inevitable, then why bother with declaring classes FeedResponse or feed anyway? Just use Json.Net's JObject , JToken , JProperty as below.
JObject rootObj = JsonConvert.DeserializeObject(jstr) as JObject;
Console.WriteLine(
"Authenticated:" + rootObj["authenticated"] +
" USER:" + rootObj["user"] +
" RESULT:" + rootObj["result"]);
foreach (JProperty feed in rootObj["feeds"])
{
Console.WriteLine(feed.Name + " " + feed.Value["feed_address"]);
}
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