Develop Reference

How do I deserialize JSON correctly in C#

I am trying to deserialize the Supreme New York JSON but I am getting an error.
I used json2csharp.com to convert the Json into classes.
Then I summarised them all into one called items
namespace SUPBOTTESTING
{
public class items
{
public string name { get; set; }
public int id { get; set; }
public string image_url { get; set; }
public string image_url_hi { get; set; }
public int price { get; set; }
public int sale_price { get; set; }
public bool new_item { get; set; }
public int position { get; set; }
public string category_name { get; set; }
public int price_euro { get; set; }
public int sale_price_euro { get; set; }
}
}
using System;
using System.Net;
using System.Web.Script.Serialization;
namespace SUPBOTTESTING
{
class Program
{
public static void Main()
{
{
string shop_json = new WebClient().DownloadString("https://www.supremenewyork.com/mobile_stock.json");
JavaScriptSerializer shop_object = new JavaScriptSerializer();
items[] shirt_stock = shop_object.Deserialize<items[]>(shop_json);
Console.WriteLine(shirt_stock[1]);
}
}
}
}
I am getting the error:
Default constructor not found for type SUPBOTTESTING.items[]

Ok here is the solution. You have the correct idea but you need to understand the structure of your Json data.
You are deserializing it into an array of Object whereas your Json data returned itself is not an Array or a List. It contains child nodes that are an array so you need to structure your Object accordingly to get a successful breakdown of data.
Here I have used Newtonsoft to deserialise the Json data into an Object.
I have tested the code and it returns a list of Shirts
static void Main(string[] args)
{
var shop_json = new WebClient().DownloadString("https://www.supremenewyork.com/mobile_stock.json");
var shirt_stock = JsonConvert.DeserializeObject<StockObject>(shop_json);
// Picking shirts to demonstrate how to display values for all shirts
var shirts = shirt_stock.products_and_categories.Shirts;
foreach (var shirt in shirts)
{
var shirtBuilder = new StringBuilder();
shirtBuilder.AppendLine($"Name: {shirt.name}");
shirtBuilder.AppendLine($"ID: {shirt.id.ToString()}");
shirtBuilder.AppendLine($"New Item: {shirt.new_item.ToString()}");
shirtBuilder.AppendLine($"Category Name: {shirt.category_name}");
Console.WriteLine(shirtBuilder);
}
}
public class StockObject
{
public ProductsCats Products_and_categories { get; set; }
}
public class ProductsCats
{
public Details[] Shirts { get; set; }
public Details[] Bags { get; set; }
public Details[] Accessories { get; set; }
public Details[] Pants { get; set; }
public Details[] Jackets { get; set; }
public Details[] Skates { get; set; }
public Details[] Hats { get; set;}
public Details[] Sweatshirts { get; set;}
[JsonProperty("Tops/Sweaters")]
public Details[] TopsSweaters { get;set;}
public Details[] New { get; set; }
}
public class Details
{
public string name { get; set; }
public int id { get; set; }
public string image_url { get; set; }
public string image_url_hi { get; set; }
public int price { get; set; }
public int sale_price { get; set; }
public bool new_item { get; set; }
public int position { get; set; }
public string category_name { get; set; }
public int price_euro { get; set; }
public int sale_price_euro { get; set; }
}
You see what I have done here?
So your Json data contains a parent node products_and_categories and its child node contains an array of Shirts which is what you are after?
StockObject class contains the Parent property called Products_and_categories of type object ProductsCats.
ProductsCats Object contains the property Shirts of type Details which is an array and will be used during the deserialising process.
Hope this helps?

Well you do not need to specify a default constructor. What is wrong is, i think you didn't check the json data properly. Because your items class is not in the first level of json. You need to create a couple of classes to be more accurate on deserializing.
First of all you need to know that this json file has a lot of bad-smells and bad-practices on it.
Note that you need to install Newtonsoft.Json before going further. It is much more convenient way to deserialize a json into C# classes.
Yet, i wrote a proper way of deserializing it:
public class BaseItem
{
public string Name { get; set; }
public int Id { get; set; }
public string Image_url { get; set; }
public string Image_url_hi { get; set; }
public int Price { get; set; }
public int Sale_price { get; set; }
public bool New_item { get; set; }
public int Position { get; set; }
public string Category_name { get; set; }
public int Price_euro { get; set; }
public int Sale_price_euro { get; set; }
}
public class Shirt : BaseItem { }
public class Bag : BaseItem { }
public class Accessory : BaseItem { }
public class Pant : BaseItem { }
public class Jacket : BaseItem { }
public class Skate : BaseItem { }
public class Hat : BaseItem { }
public class Sweatshirt : BaseItem { }
public class TopsSweater : BaseItem { }
public class New : BaseItem { }
public class RootObject
{
public List<object> Unique_image_url_prefixes { get; set; }
public ProductsAndCategories Products_and_categories { get; set; }
public string Release_date { get; set; }
public string Release_week { get; set; }
}
public class ProductsAndCategories
{
public List<Shirt> Shirts { get; set; }
public List<Bag> Bags { get; set; }
public List<Accessory> Accessories { get; set; }
public List<Pant> Pants { get; set; }
public List<Jacket> Jackets { get; set; }
public List<Skate> Skate { get; set; }
public List<Hat> Hats { get; set; }
public List<Sweatshirt> Sweatshirts { get; set; }
[JsonProperty("Tops/Sweaters")]
public List<TopsSweater> TopsSweaters { get; set; }
public List<New> New { get; set; }
}
First of all, all of your items are have the same properties on them, yet, they all marked as different properties. So that, i created a BaseItem class and other empty classes which are inherited from that.
Also you need other 2 classes -which are RootObject and ProductsAndCategories- to provide data on them. Note that there is a JsonProperty("blabla") on the TopsSweaters property. Because, in json file it is Tops/Sweaters, and you can not use that name on a C# property. That is the attribute for using that kind of different property names.
Then you can populate your object like this:
static void Main(string[] args)
{
var jsonData = "https://www.supremenewyork.com/mobile_stock.json";
string shopJson = new WebClient().DownloadString(jsonData);
RootObject shirtStock = JsonConvert.DeserializeObject<RootObject>(shopJson); //All json data is in this variable
Console.WriteLine(shirtStock.Products_and_categories.Shirts[1]);
}

Your problem is that youre using a class to load the JSON data in, where you should use a struct, alternatively you can also create a constructor that takes no arguments and sets all variables to default values, which is a lot of work so just replace class with struct:
public struct Items
{
public string Name { get; set; }
public int Id { get; set; }
public string Image_Url { get; set; }
public string Image_Url_Hi { get; set; }
public int Price { get; set; }
public int Sale_Price { get; set; }
public bool New_item { get; set; }
public int Position { get; set; }
public string Category_Name { get; set; }
public int Price_Euro { get; set; }
public int Sale_Price_Euro { get; set; }
}
Also please stick to C# naming conventions, you should be able to do this since most JSON parsers are case insensitive by default.
Some more info: A class doesnt really has a proper default constructor if you dont define one, where as a struct always has a default constructor, so when the JSON parser wants to init your class it cant because a default constructor isnt definded.

static void Main(string[] args)
{
string shop_json = new WebClient().DownloadString("https://www.supremenewyork.com/mobile_stock.json");
JavaScriptSerializer shop_object = new JavaScriptSerializer();
var shirt_stock = shop_object.Deserialize<NewYarkItems>(shop_json);
var v = shirt_stock;
}
public class NewYarkItems
{
public dynamic unique_image_url_prefixes { get; set; }
public products_and_categories products_And_Categories { get; set; }
public string release_date { get; set; }
public string release_week { get; set; }
}
public class products_and_categories
{
public List<items> Jackets { get; set; }
}
public class items
{
public string name { get; set; }
public int id { get; set; }
public string image_url { get; set; }
public string image_url_hi { get; set; }
public int price { get; set; }
public int sale_price { get; set; }
public bool new_item { get; set; }
public int position { get; set; }
public string category_name { get; set; }
public int price_euro { get; set; }
public int sale_price_euro { get; set; }
}

How to remove $ for json result?

I am trying to read a cell value from a simple google sheet
https://docs.google.com/spreadsheets/d/1opP1t_E9xfuLXBkhuyzo5j9k_xBNDx0XKb31JwLP1MM/edit?usp=sharing
then I published it and I get an API link that return JSON, check the following
https://spreadsheets.google.com/feeds/list/1opP1t_E9xfuLXBkhuyzo5j9k_xBNDx0XKb31JwLP1MM/1/public/values?alt=json
when I tried to generate C# classes from JSON using http://json2csharp.com/, I get
invalid_name and $ (which is not fine for csharp compiler)
public class Id
{
public string __invalid_name__$t { get; set; }
}
public class Updated
{
public DateTime __invalid_name__$t { get; set; }
}
public class Category
{
public string scheme { get; set; }
public string term { get; set; }
}
public class Title
{
public string type { get; set; }
public string __invalid_name__$t { get; set; }
}
public class Link
{
public string rel { get; set; }
public string type { get; set; }
public string href { get; set; }
}
public class Name
{
public string __invalid_name__$t { get; set; }
}
public class Email
{
public string __invalid_name__$t { get; set; }
}
public class Author
{
public Name name { get; set; }
public Email email { get; set; }
}
public class OpenSearchTotalResults
{
public string __invalid_name__$t { get; set; }
}
public class OpenSearchStartIndex
{
public string __invalid_name__$t { get; set; }
}
public class Id2
{
public string __invalid_name__$t { get; set; }
}
public class Updated2
{
public DateTime __invalid_name__$t { get; set; }
}
public class Category2
{
public string scheme { get; set; }
public string term { get; set; }
}
public class Title2
{
public string type { get; set; }
public string __invalid_name__$t { get; set; }
}
public class Content
{
public string type { get; set; }
public string __invalid_name__$t { get; set; }
}
public class Link2
{
public string rel { get; set; }
public string type { get; set; }
public string href { get; set; }
}
public class GsxName
{
public string __invalid_name__$t { get; set; }
}
public class GsxPhonenumber
{
public string __invalid_name__$t { get; set; }
}
public class Entry
{
public Id2 id { get; set; }
public Updated2 updated { get; set; }
public List<Category2> category { get; set; }
public Title2 title { get; set; }
public Content content { get; set; }
public List<Link2> link { get; set; }
public GsxName __invalid_name__gsx$name { get; set; }
public GsxPhonenumber __invalid_name__gsx$phonenumber { get; set; }
}
public class Feed
{
public string xmlns { get; set; }
public string __invalid_name__xmlns$openSearch { get; set; }
public string __invalid_name__xmlns$gsx { get; set; }
public Id id { get; set; }
public Updated updated { get; set; }
public List<Category> category { get; set; }
public Title title { get; set; }
public List<Link> link { get; set; }
public List<Author> author { get; set; }
public OpenSearchTotalResults __invalid_name__openSearch$totalResults { get; set; }
public OpenSearchStartIndex __invalid_name__openSearch$startIndex { get; set; }
public List<Entry> entry { get; set; }
}
public class RootObject
{
public string version { get; set; }
public string encoding { get; set; }
public Feed feed { get; set; }
}
I want to serialize and deserialize this class, also i want to remove $,what i need to do?

Obviously json2csharp converts each json object into a class and converts the key names into variable names literally. So whenever it finds a key name starting with $ it can't create a c# variable with this character and it precedes the variable name with a _invalid_name_. There is nothing wrong here.
You should tell why do you want to remove this invalid_name phrase from variable name? do you want to serialize and deserialize this class? If so you could use NewtonSoft Json library and define those fields with $ sign like this:
[JsonProperty(PropertyName = "$t")]
public string t { get; set; }
this will allow you to serialize/deserialize the json doc
same for gsx$name:
[JsonProperty(PropertyName = "gsx$name")]
public string gsxname { get; set; }

How to parse specific data from JSON response [duplicate]

This question already has answers here:
How can I deserialize JSON with C#?
(19 answers)
Closed 5 years ago.
I am trying to parse JSON response using newtownsoft.json trying to parse the followers count and writeline.
This is the code:
using Newtonsoft.Json;
using System;
using System.IO;
using System.Net;
namespace J2C
{
class Checker
{
static void Main(string[] args)
{
var client = new WebClient();
var text = client.DownloadString("https://www.instagram.com/2saleapp/?__a=1");
User userObject = JsonConvert.DeserializeObject<User>(text);
Console.WriteLine("Followers count =" + userObject.followed_by);
Console.ReadKey();
}
}
}
and this is the API response:
{
"user": {
"biography": "Install 2Sale app to post your AD instantly!\nSnap, post, and sell. Its time to sale.",
"blocked_by_viewer": false,
"country_block": false,
"external_url": "http://autoigs.com/2sale_install",
"external_url_linkshimmed": "http://l.instagram.com/?u=http%3A%2F%2Fautoigs.com%2F2sale_install&e=ATMoKdz87_iz044M0ebrfU95WQT7JqBpnlGiGH9UDOsn7dRax7G6ZMxjh7wMuHY",
"followed_by": {
"count": 6511
},
"followed_by_viewer": false,
"follows": {
"count": 19
},
I just want to WriteLine Followed_by count numbers.
Any one can help me?
thank you

Copy the raw json to the clipboard. In Visual Studio menu select Edit > Paste Special > Paste JSON As Classes (this item is present at least since version VS2015. For earlier versions see). This will generate a set of classes.
public class Rootobject
{
public User user { get; set; }
public string logging_page_id { get; set; }
}
public class User
{
public string biography { get; set; }
public bool blocked_by_viewer { get; set; }
public bool country_block { get; set; }
public string external_url { get; set; }
public string external_url_linkshimmed { get; set; }
public Followed_By followed_by { get; set; }
public bool followed_by_viewer { get; set; }
public Follows follows { get; set; }
public bool follows_viewer { get; set; }
public string full_name { get; set; }
public bool has_blocked_viewer { get; set; }
public bool has_requested_viewer { get; set; }
public string id { get; set; }
public bool is_private { get; set; }
public bool is_verified { get; set; }
public string profile_pic_url { get; set; }
public string profile_pic_url_hd { get; set; }
public bool requested_by_viewer { get; set; }
public string username { get; set; }
public object connected_fb_page { get; set; }
public Media media { get; set; }
}
public class Followed_By
{
public int count { get; set; }
}
public class Follows
{
public int count { get; set; }
}
public class Media
{
public Node[] nodes { get; set; }
public int count { get; set; }
public Page_Info page_info { get; set; }
}
public class Page_Info
{
public bool has_next_page { get; set; }
public string end_cursor { get; set; }
}
public class Node
{
public string __typename { get; set; }
public string id { get; set; }
public bool comments_disabled { get; set; }
public Dimensions dimensions { get; set; }
public object gating_info { get; set; }
public string media_preview { get; set; }
public Owner owner { get; set; }
public string thumbnail_src { get; set; }
public object[] thumbnail_resources { get; set; }
public bool is_video { get; set; }
public string code { get; set; }
public int date { get; set; }
public string display_src { get; set; }
public string caption { get; set; }
public Comments comments { get; set; }
public Likes likes { get; set; }
public int video_views { get; set; }
}
public class Dimensions
{
public int height { get; set; }
public int width { get; set; }
}
public class Owner
{
public string id { get; set; }
}
public class Comments
{
public int count { get; set; }
}
public class Likes
{
public int count { get; set; }
}
Next, use the Rootobject. It's supposed to work.
var client = new WebClient();
var text = client.DownloadString("https://www.instagram.com/2saleapp/?__a=1");
Rootobject rootObject = JsonConvert.DeserializeObject<Rootobject>(text);
Console.WriteLine("Followers count =" + rootObject.user.followed_by.count);
In general, you should change the naming to conform to the generally accepted naming rules. You should use the JsonProperty attribute.
public class Rootobject
{
[JsonProperty("user")]
public User User { get; set; }
[JsonProperty("logging_page_id")]
public string LoggingPageId { get; set; }
}
And so on.

Create a class with name User in order to deserialize json string to User.
public class User
{
public string biography { get; set; }
public bool blocked_by_viewer { get; set; }
public bool country_block { get; set; }
public string external_url { get; set; }
public string external_url_linkshimmed { get; set; }
public FollowedBy followed_by { get; set; }
public string followed_by_viewer { get; set; }
public Follow follows { get; set; }
}
public class FollowedBy
{
public int count { get; set; }
}
public class Follow
{
public int count { get; set; }
}
After getting json string result using the below line for DeserializeObject to User and then assign it to new User object , after that use userObject for showing result.
User userObject = JsonConvert.DeserializeObject<User>(jsonString);
Now you have a user object that fill property with the API response.

Nested Collection Mapping in Automapper

Am trying to map nested collections using automapper and I have done the basic setup and configuration. When I try to do the map it the nested values are coming as null. I have tried to follow few posts and put together something. I want the list to have a hierarchy instead of flattening. Any help around this would be great.
Source Entities:
public class OuterEntity
{
public int ID { get; set; }
public string Name { get; set; }
public List<InnerEntity> InnerEntityList { get; set; }
}
public class InnerEntity
{
public int InnerId { get; set; }
public string InnerName { get; set; }
public List<InnerMostEntity> InnerMostList { get; set; }
}
public class InnerMostEntity
{
public int InnerMostId { get; set; }
public string InnerMostName { get; set; }
public DateTime ModifiedDate { get; set; }
}
Destination Entities:
public class OuterEntityDTO
{
public int ID { get; set; }
public string Name { get; set; }
public List<InnerEntity> InnerEntityList { get; set; }
}
public class InnerEntityDTO
{
public int InnerId { get; set; }
public string InnerName { get; set; }
public List<InnerMostEntity> InnerMostList { get; set; }
}
public class InnerMostEntityDTO
{
public int InnerMostId { get; set; }
public string InnerMostName { get; set; }
public DateTime ModifiedDate { get; set; }
}
Controller Class:
public List<OuterEntityDTO> GetAll()
{
var outerEntityList = myRepo.GetAll(); //Type of List<OuterEntity>
var config = new MapperConfiguration(cfg =>
{
cfg.CreateMap<OuterEntity, OuterEntityDTO>().ReverseMap();
cfg.CreateMap<InnerEntity, InnerEntityDTO>().ReverseMap();
cfg.CreateMap<InnerMostEntity, InnerMostEntityDTO>().ReveseMap();
});
config.AssertConfigurationIsValid();
var innerMostDTO = Mapper.Map<List<OuterEntity>,List<OuterEntityDTO>>(outerEntityList);
//The inner list at first level itself is null.
return innerMostDTO;
}
Am trying to achieve this in DOT NET Core. Autommaper version is 6.1.1

I think you should have a wrong class hierarchy in DTO classes, as you have
public List<InnerMostEntity> InnerMostList { get; set; }
in public class InnerEntityDTO, you should write it as
public List<InnerMostEntityDTO> InnerMostList { get; set; }

PHP error with multiple levels of key-value JSON pairs

I am using multiple levels of JSON data coming into php from a C# application, as in:
public class User_Group
{
public int ID_UserGroup { get; set; }
public string Name_UserGroup { get; set; }
public int UserID { get; set; }
}
public class User_Role
{
public int ID_User { get; set; }
public string Role_User { get; set; }
public string User_Role_Description { get; set; }
public List<User_Group> UserGroup { get; set; }
}
public class Stand_Orte
{
public int ID { get; set; }
public string Bezeichnung { get; set; }
public List<Modul> modul { get; set; }
}
public class Modul
{
public string ID { get; set; }
public string Seriennummer { get; set; }
public string Bezeichnung { get; set; }
public string StandortID { get; set; }
public List<Mess_Kanal> MessKanal { get; set; }
}
public class Mess_Kanal
{
public string ID { get; set; }
public string ModulID { get; set; }
public List<LogMess_Daten> LogMessDaten { get; set; }
}
public class LogMess_Daten
{
public string KanalID { get; set; }
public string Zeitstempel { get; set; }
}
public class RootObject
{
public int ID_Project { get; set; }
public string Name_Project { get; set; }
public int Receiver_ID { get; set; }
public string Receiver_Name { get; set; }
public int UserID { get; set; }
public User_Role UserRole { get; set; }
public Stand_Orte Standorte { get; set; }
}
I have an issue with accessing the 3rd level data elements.
For Eg., I am able to get the values uptil Project-> Stand_Orte-> Modul. but after that Project-> Stand_Orte-> Modul-> MessKanal Throws an error in PHP as " Trying to get property of non-object ".
I tried the following:
$phpArray['project']->Standorte[0]->modul[0]->MessKanal[0]->ID
$messkanals=$phpArray->Standorte->modul->MessKanal;
And then used a "foreach ($messkanals as $messkanal)" to insert MessKanal data into MYSQL.
it gives me the following errors respectively.
Cannot use object of type stdClass as array
Trying to get property of non-object
does anyone have any idea?
Thanks,
Revathy