I'm trying to deserialize some Json using the JsonConvert. The example in JSON that I want to handle is:
2 {
3 'Name': 'Product 1',
4 'ExpiryDate': '2000-12-29T00:00Z',
5 'Price': 99.95,
6 'Sizes':{ 'Tall': 30
'ExtraTall':40
}
7 },
8 {
9 'Name': 'Product 2',
10 'ExpiryDate': '2009-07-31T00:00Z',
11 'Price': 12.50,
12 'Sizes': null
13 }
I already tried some stuff like:
var handlerLocal= JsonConvert.DeserializeObject <Dictionary <string,Dictionary<string,string>>>(z);
Till now I'm only handling simple lists using this:
var handlerLocal = JsonConvert.DeserializeObject<FriendsHandler>(z);
FriendHandler works like a model. But in this new case I have a List inside a List and that is killing me.
Anyone can help me?
Best regards
In general with JSON.net you can just write a object that matches what you're parsing correctly and then use DeserializeObject as you have.
In this case the JSON you have provided is invalid. It would be a dictionary in the case that it looked like this:
{'thing1': {
'Name': 'Product 1',
'ExpiryDate': '2000-12-29T00:00Z',
'Price': 99.95,
'Sizes':{ 'Tall': 30
'ExtraTall':40
}
},
'thing2': {
'Name': 'Product 2',
'ExpiryDate': '2009-07-31T00:00Z',
'Price': 12.50,
'Sizes': null
}}
I think it should be an array, which means it should be surrounded by [].
To parse this, just do this:
var handlerLocal = JArray.Parse(z).ToObject<List<FriendsHandler>>();
When trying to deserialise JSON, I find it best to use Json2Sharp.com to create classes to contain data, however the JSON you've provided is invalid so it's not possible to create a class from this.
If you could find some valid JSON to use, this tool will handle the rest for you.
Create a model like this:
public class Product
{
public string Name { get; set; }
public DateTime ExpiryDate { get; set; }
public decimal Price { get; set; }
public Dictionary<string, int> Sizes { get; set; }
}
Get your JSON
var productsJson = << Call some repo that returns json string >>
Then call
var products = JsonConvert.DeserializeObject<List<Product>>(productsJson);
NOTE: You will need to make your JSON valid first, it is syntactically incorrect at the moment
******EDIT*******
The question needs updating (see comments), your models would look like this
public class Self
{
public string DeviceID { get; set; }
public string TimeStamp { get; set; }
}
public class Location
{
public string RoomID { get; set; }
public string Room { get; set; }
}
public class Friend
{
public string IdUser { get; set; }
public string Name { get; set; }
public Location Location { get; set; }
}
public class RootObject
{
public Self Self { get; set; }
public List<Friend> Friends { get; set; }
}
then
var products = JsonConvert.DeserializeObject<RootObject>(productsJson);
Related
I need to save data retrieved from API to a DataTable. JSON which is returned from API can't be deserialized directly to DataTable using this code:
DataTable dt = (DataTable)JsonConvert.DeserializeObject(json, (typeof(DataTable)));
I got an error: Unexpected JSON token when reading DataTable. I read that it's beacuse JSON format is not as it should be. Mine is as follows:
{
"page": 1,
"page_size": 1000,
"items": [
{
"id": "e1b019b9a8bf408c9cb964c29e845104",
"asset_id": "5adb0d87882b4e14b99bde74a967e84c",
"alias": "Concrete Pump Yellow",
"serial_number": "QEQ000123",
"model": {
"name": "Pump C50-HP"
},
"operating_hours": {
"hours": 100,
"unit_driven": true
}
}
]
}
I know I need format like [{..}] but can't find workaround, API returns JSON as above. I can deserialize it using this:
var obj = JsonConvert.DeserializeObject(json);
but how can I now add data to DataTable? I'm looking for a solution for it
What the JsonConvert class does is it materializes your string version of the response into an object. For this to work, your string version has to match the structure of the resulting object or the class needs hints to know how to inflate the object. The runtime is telling you that there is a mismatch and it doesn't know how to resolve it.
There are a few ways to get this done. I prefer an structured approach so I would recommend you create classes to receive the data:
var payload = #"{
""page"": 1,
""page_size"": 1000,
""items"": [
{
""id"": ""e1b019b9a8bf408c9cb964c29e845104"",
""asset_id"": ""5adb0d87882b4e14b99bde74a967e84c"",
""alias"": ""Concrete Pump Yellow"",
""serial_number"": ""QEQ000123"",
""model"": {
""name"": ""Pump C50-HP""
},
""operating_hours"": {
""hours"": 100,
""unit_driven"": true
}
}
]
}";
public class ApiResponse
{
[JsonProperty("page")]
public int Page { get; set; }
[JsonProperty("page_size")]
public int PageSize { get; set; }
[JsonProperty("items")]
public IEnumerable<ApiResponseItem> Items { get; set; }
}
public class ApiResponseItem
{
[JsonProperty("id")]
public string Id { get; set; }
[JsonProperty("asset_id")]
public string AssetId { get; set; }
[JsonProperty("alias")]
public string Alias { get; set; }
[JsonProperty("serial_number")]
public string SerialNumber { get; set; }
[JsonProperty("model")]
public ApiResponseModel Model { get; set; }
[JsonProperty("operating_hours")]
public ApiResponseOperatingHours OperatingHours { get; set; }
}
public class ApiResponseModel
{
[JsonProperty("name")]
public string Name { get; set; }
}
public class ApiResponseOperatingHours
{
[JsonProperty("hours")]
public string Hours { get; set; }
[JsonProperty("unit_driven")]
public bool UnitDriven { get; set; }
}
var response = JsonConvert.DeserializeObject<ApiResponse>(payload);
As you can see, the classes use hint attributes to let the deserializer know about the fields. You can then loop through the response.Items enumerable and consume the items as desired.
UPDATE:
For posterity and at the suggestion of #mason, it's important to point out that there is no need to use a DataTable. A quick inspection of the payload reveals the output is a paged version of set of records so it's not equivalent to a data table.
Your issue here is that the json you're deserializing is not a DataTable, its just an Object.
JsonConvert.DeserializeObject(request, typeof(Object)) -> Where Object would be a defined Class with parameter definitions to deserialize the json to, i.e page, page_size, id etc..
Once in this format its fairly easy to coerce it into a DataTable:
https://learn.microsoft.com/en-us/dotnet/api/system.data.datatable?view=net-6.0
The Classes would look something along the lines of:
public class Items
{
public Guid? Id {get;set;}
public Guid? AssetId {get;set;}
public string alias {get;set;}
public string serial_number {get;set;}
public Model model {get;set;}
public OperatingHours operatingHours {get;set;}
}
public class Model
{
public string Name { get;set;}
}
public class OperatingHours
{
public int Hours {get;set;}
public bool Unit_Driven {get;set;}
}
public class OverallObject
{
public int Page {get;set;}
public int PageSize {get;set;}
public List<Items> AllItems {get;set;}
}
I am new to Json and trying to do some examples with it. I have Json data like this:
{
"Title": "The Avengers",
"Year": "2012",
"Rated": "PG-13",
"Released": "04 May 2012",
"Runtime": "143 min",
"Genre": "Action, Adventure, Sci-Fi",
"Director": "Joss Whedon",
"Writer": "Joss Whedon (screenplay), Zak Penn (story), Joss Whedon (story)",
"Actors": "Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth",
"Plot": "Earth's mightiest heroes must come together and learn to fight as a team if they are going to stop the mischievous Loki and his alien army from enslaving humanity.",
"Language": "English, Russian, Hindi",
"Country": "USA",
"Awards": "Nominated for 1 Oscar. Another 38 wins & 79 nominations.",
"Poster": "https://m.media-amazon.com/images/M/MV5BNDYxNjQyMjAtNTdiOS00NGYwLWFmNTAtNThmYjU5ZGI2YTI1XkEyXkFqcGdeQXVyMTMxODk2OTU#._V1_SX300.jpg",
"Ratings": [
{
"Source": "Internet Movie Database",
"Value": "8.0/10"
},
{
"Source": "Rotten Tomatoes",
"Value": "92%"
},
{
"Source": "Metacritic",
"Value": "69/100"
}
],
"Metascore": "69",
"imdbRating": "8.0",
"imdbVotes": "1,200,683",
"imdbID": "tt0848228",
"Type": "movie",
"DVD": "25 Sep 2012",
"BoxOffice": "$623,279,547",
"Production": "Walt Disney Pictures",
"Website": "http://marvel.com/avengers_movie",
"Response": "True"
}
I can get the data and read it just fine but when it comes deserialize I get the following error:
Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Deneme.Modeller.Main]' 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.
This is my code
string url = "http://www.omdbapi.com/?apikey=7663ce8e&t=Avengers";
WebRequest request = WebRequest.Create(url);
WebResponse reply;
reply = request.GetResponse();
StreamReader returninfo = new StreamReader(reply.GetResponseStream());
string getinfo = returninfo.ReadToEnd();
List<Main> Info = JsonConvert.DeserializeObject<List<Main>>(getinfo);
and for models this is first main:
public string Title { get; set; }
public string Year { get; set; }
public string Rated { get; set; }
public string Released { get; set; }
public string Runtime { get; set; }
public string Genre { get; set; }
public string Director { get; set; }
public string Writer { get; set; }
public string Actors { get; set; }
public string Plot { get; set; }
public string Language { get; set; }
public string Country { get; set; }
public string Awards { get; set; }
public string Poster { get; set; }
public List<Rating> Ratings { get; set; }
public string Metascore { get; set; }
public string imdbRating { get; set; }
public string imdbVotes { get; set; }
public string imdbID { get; set; }
public string Type { get; set; }
public string DVD { get; set; }
public string BoxOffice { get; set; }
public string Production { get; set; }
public string Website { get; set; }
public string Response { get; set; }
second one is for Ratings:
public string Source { get; set; }
public string Value { get; set; }
public virtual ICollection<Main> Mains { get; set; }
It's about Json array, but I looked asked questions about this problem and tried to fix it but no luck. What am I missing?
You are trying to deserialize a single object of type Main into a list of objects.
You can either change your code to deserialize into a single object instead of a list or you can alter your JSON to represent an array of objects.
The first option would be
Main Info = JsonConvert.DeserializeObject<Main>(getinfo);
And the second option
[{"Title":"The Avengers","Year":"2012","Rated":"PG-13","Released":"04 May 2012","Runtime":"143 min","Genre":"Action, Adventure, Sci-Fi","Director":"Joss Whedon","Writer":"Joss Whedon (screenplay), Zak Penn (story), Joss Whedon (story)","Actors":"Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth","Plot":"Earth's mightiest heroes must come together and learn to fight as a team if they are going to stop the mischievous Loki and his alien army from enslaving humanity.","Language":"English, Russian, Hindi","Country":"USA","Awards":"Nominated for 1 Oscar. Another 38 wins & 79 nominations.","Poster":"https://m.media-amazon.com/images/M/MV5BNDYxNjQyMjAtNTdiOS00NGYwLWFmNTAtNThmYjU5ZGI2YTI1XkEyXkFqcGdeQXVyMTMxODk2OTU#._V1_SX300.jpg","Ratings":[{"Source":"Internet Movie Database","Value":"8.0/10"},{"Source":"Rotten Tomatoes","Value":"92%"},{"Source":"Metacritic","Value":"69/100"}],"Metascore":"69","imdbRating":"8.0","imdbVotes":"1,200,683","imdbID":"tt0848228","Type":"movie","DVD":"25 Sep 2012","BoxOffice":"$623,279,547","Production":"Walt Disney Pictures","Website":"http://marvel.com/avengers_movie","Response":"True"}]
(simply add brackets)
Which option you have to choose is depending on your requirements, i.e. if you want to allow multiple objects or just one.
Main Info = JsonConvert.DeserializeObject<Main>(getinfo);
Your json string has only one Main object, you were trying to get a List
You try to deserialize one JSON object into a list of objects.
This is an example of simple object:
{ "field": 123 }
To deserialize it you need to:
var obj = JsonConvert.DeserializeObject<SomeModel>(json);
But if you have an array of objects:
[{ "field": 123 }, { "field": 123 }]
You will be able to deserialize them to a list like this:
var objs = JsonConvert.DeserializeObject<SomeModel[]>(json);
or
var objs = JsonConvert.DeserializeObject<List<SomeModel>>(json);
Solutions to your question:
Change deserialization type to a single object.
Wrap your JSON around with []
when we call api 'http://www.omdbapi.com/?apikey=7663ce8e&t=Avenger' we gets an objet not an array of object
try
var info = JsonConvert.DeserializeObject<Main>(getinfo);
If you want list of movies try a other api b.e.: themoviedbAPI
I am attempting to get a value for a game from JSON, but there are multiple fields with the same name, so I was wondering whether there was a way in which I could just retrieve that individual value, here is the basic JSON structure:
"response": {
"game_count": 119,
"games": [
{
"appid": 3920,
"playtime_forever": 0
},
{
"appid": 4000,
"playtime_forever": 278
},
...
I need to somehow get a property by using an appID and then retrieving the playtime_forever key.
You can convert your JSON to class and then query:
class ResponseJSON
{
[JsonProperty("response")]
public Result Response { get; set; }
}
class Result
{
[JsonProperty("game_count")]
public string Count { get; set; }
[JsonProperty("games")]
public List<Game> Gmaes { get; set; }
}
class Game
{
[JsonProperty("appid")]
public string Id { get; set; }
[JsonProperty("playtime_forever")]
public string PlayTime { get; set; }
}
var resp = JsonConvert.DeserializeObject<ResponseJSON>(jsonstr);
And then you can iterate through your object with a for loop:
foreach(game in resp.Respone.Games) {
var playtime = game.PlayTime;
// do stuff here
}
Or you can use linq to query your games:
var selectiveGames = resp.Response.Games.Where(x=> x.PlayTime == 220).ToList();
You need to add newtonsoft dll from here to your project if you don't have it;
UPDATE: With original JSON the code above is working perfect.
I'm facing some problems with the read of a JSON file, which is this one:
{
"giocatori": [
{
"Giocatore": "124",
"Cognome": "DE SANCTIS",
"Ruolo": "P",
"Squadra": "ROM"
},
{
"Giocatore": "140",
"Cognome": "MIRANTE",
"Ruolo": "P",
"Squadra": "PAR"
},
{
"Giocatore": "156",
"Cognome": "SKORUPSKI",
"Ruolo": "P",
"Squadra": "ROM"
}
],
"success": 1
}
What I want to get from this PHP is an List, where the Player's class with this attributes;
public string Giocatore;
public string Cognome;
public string Ruolo;
public string Squadra;
I don't know why, but I face some problems with the Microsoft.Json library, in particular with Json.DeserializeObject> method, which is not able to read that web page. Can you provide some hint how to obtain a List in C# of Player ? Thank you so much for your support !
Go to http://json2csharp.com/, post your JSON there, and get the following classes:
public class Giocatori
{
public string Giocatore { get; set; }
public string Cognome { get; set; }
public string Ruolo { get; set; }
public string Squadra { get; set; }
}
public class RootObject
{
public List<Giocatori> giocatori { get; set; }
public int success { get; set; }
}
To deserialize your JSON string with JavaScriptSerializer, do:
var root = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<RootObject>(jsonString);
var list = root.giocatori;
To deserialize your JSON string with Json.NET, a widely used, free, open source JSON serializer, download and install it according to the instructions on the home page and do:
var root = Newtonsoft.Json.JsonConvert.DeserializeObject<RootObject>(jsonString);
var list = root.giocatori;
Current I have a project where I'm getting the following sample data ( I want to retrieve only the ids within this json string and stuff them into IEnumerables (explained below):
{
"states": [
{
"id": "AL",
"text": "Alabama (AL)"
},
{
"id": "CO",
"text": "Colorado (CO)"
}
],
"cities": [
{
"id": 71761,
"text": "New Brockton, AL"
},
{
"id": 74988,
"text": "Nathrop, CO"
}
],
"zipCodes": []
}
Notice in the zipCodes, I am getting an empty set, so there is no "id" or "text".
I want to be able to create several IEnumerables from the properties found in this JSON string.
I created an object called Locations that looks like this:
public class Location
{
public IEnumerable<string> States { get; set; }
public IEnumerable<string> ZipCodes { get; set; }
public IEnumerable<decimal> Cities { get; set; }
}
The best way I found to going about this approach is to do each data property one by one and convert, formValues is the json string:
JArray arrStates = (JArray)formValues["states"];
JArray arrCities = (JArray)formValues["cities"];
JArray arrZip = (JArray)formValues["zipCodes"];
and then set the properties in the location object as so:
Location loc = new Location();
loc.States = arrStates.Children().Select(m=>m["id"].Value<string>());
loc.ZipCodes = arrCities.Children().Select(m=>m["id"].Value<string>());
loc.Cities = arrZip.Children().Select(m=>m["id"].Value<string>());
I was wondering if there's a better way of doing this instead of doing all this code maintenance for whenever my json response adds a new property. In fact, I think there's going to be about ten more properties added to the json string.
I want it to be reduced down to where I could just update the Location object, and have the json automatically map to the properties that way. Or atleast a solution that has less maintenance than what I'm doing now.
Also I was wondering if JsonConvert.DeserializeObject would work in my case; but read that JSON.NET treats an IEnumerable as an array, so I'm stumped on this one.
JsonConvert.DeserializeObject would work in your case and it will have less maintenance than what you're doing now.
If you enter your json data to http://json2csharp.com, below is the generated class definition that you can use, I renamed RootObject to Location
public class State
{
public string id { get; set; }
public string text { get; set; }
}
public class City
{
public int id { get; set; }
public string text { get; set; }
}
public class Location
{
public List<State> states { get; set; }
public List<City> cities { get; set; }
public List<object> zipCodes { get; set; }
}
This is how you deserialize the json data into Location
string jsonData = ...; // set the json data here
var location = JsonConvert.DeserializeObject<Location>(jsonData);
You can enumerate through the nested properties to get the ids, for example location.states[0].id will return "AL" and location.cities[1].id will return 74988.
If there's a new property in the json data, let's say it's named countries with id and text like in states, you can create a new Country class
public class Country
{
public string id { get; set; }
public string text { get; set; }
}
and add countries property to Location class
public class Location
{
public List<State> states { get; set; }
public List<City> cities { get; set; }
public List<object> zipCodes { get; set; }
public List<Country> countries { get; set; }
}