I have a List Object which internal contains a list of Products Object. I have to return this as a Json format to UI.
Here is the sample nested List which I am getting.
How to add List<B> to Object A, where List<B> is part of class A
I am using JsonResult to return a Json format, but only Customer list Object is getting converted. inner list Product object is missing.
Please someone suggest me how the nested list gets serialized.
Say you have two list
public class Customer
{
[JsonProperty("customer_id")]
public int CustomerId { get; set; }
[JsonProperty("name")]
public string Name { get; set; }
[JsonProperty("products")]
public List<Products> Products { get; set; }
}
public class Products
{
[JsonProperty("product_id")]
public string ProductId { get; set; }
[JsonProperty("name")]
public string Name { get; set; }
}
//initialize Object of Customer here
Use Newtonsoft to convert Customer object into json
var jsonString = JsonConvert.SerializeObject(objCustomer);
You can also take advantage of several formatting options available.
Update
Per your comment - pass the serialize data
return Ok(JsonConvert.SerializeObject(objCustomer))
Also, if you direct pass objCustomer like
return Ok(objCustomer)
it should return you Json (provided you have not configured your project to return another format by default)
assuming you want to return the customers list from your previous post:
you need to import Newtonsoft.Json package into your application
using Newtonsoft.Json;
public your_method() {
List<Customer> customers = your_method_to_return_curstomers();
var jsonValue = Newtonsoft.Json.JsonConvert.SerializeObject(customers);
}
Fiddle example
please init your Products list in Customer constructor (I don't now if this can be a possibility for your problem)
public class Customer
{
public Customer() {
Products = new List<Product>();
}
public int CustomerId {get;set;}
public string Name {get;set;}
public List<Products> Products {get;set;}
}
Related
I have a requirement where I have incoming json object of the following format:
{
"CustomerList": {
"Customer": [{
"CustomerCode" : "C123",
"CustomerName" : "Peter"
},
{
"CustomerCode" : "C456",
"CustomerName" : "John"
}]
}
}
And I have the my C# object of the following Format:
[System.Xml.Serialization.XmlArrayItemAttribute(IsNullable = "false")]
public Customer[] CustomerList
{
get; set;
}
[System.Xml.Serialization.XmlTypeAttribute()]
public class Customer
{
public string CustomerCode {get; set;}
public string CustomerName {get; set;}
}
During Deserialization using JsonConvert.DeserializeObject(), I get the following error:
Cannot deserialize the current JSON object into type Customer[], because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
On my side the limitation is that I cannot change the incoming JSON object and neither can I modify the C# object structure. So the ask is that, is there a way to map the Customer node in the incoming Json, to the CustomerList C# array directly, without needing to rename or change the structure of either?
Based on the JSON you have shared, you need to have following class structure.
public class Customer {
public string CustomerCode { get; set; }
public string CustomerName { get; set; }
}
public class CustomerList {
public List<Customer> Customer { get; set; }
}
public class RootObject {
public CustomerList CustomerList { get; set; }
}
and then you need to deserizalize the JSON as following.
RootObject obj = JsonConvert.DeserializeObject<RootObject>(jsonString);
Here jsonString is the string variable which has the JSON string.
I hope you this will help you resolve your issue.
To deserialize the JSON object you need to create a similar C# class.
public class JsonObjectTest {
[JsonPropertyName("CustomerList")]
public Customer CustomerPreList {get;set;}
}
public class Customer {
public List<CustomerObject> Customer {get;set;}
}
public class CustomerObject {
public string CustomerCode { get; set; }
public string CustomerName { get; set; }
}
Afterwards you deserialize the JSON object:
CustomerList xmlData = JsonConvert.DeserializeObject<JsonObjectTest>(jsonObjectString).Select(data =>
new CustomerList = data.CustomerPreList.toArray());
Unfortunately I could not ask you if you have a permission to create new classes (I need more points). If this is the case try AutoMapper to create a mapping policy for this specific case.
Happy coding :)
If you cannot (or do not want to) add new classes, the last two lines of GetCustomers() below should do what you want. Just assign it to the CustomerList property.
public class Customer
{
public string? CustomerCode { get; set; }
public string? CustomerName { get; set; }
}
public Customer[] GetCustomers()
{
string json = #"{
'CustomerList':
{
'Customer': [{
'CustomerCode' : 'C123',
'CustomerName' : 'Peter'
},
{
'CustomerCode' : 'C456',
'CustomerName' : 'John'
}]
}
}";
dynamic? contentObj = JsonConvert.DeserializeObject(json);
return (contentObj?.CustomerList.Customer.ToObject<IList<Customer>>())?.ToArray() ?? new List<Customer>().ToArray();
}
I am working with .NET 6.0 so working with string? but for earlier versions of c# string should do the same. Play with the null handling as required.
I'm writing a console app to retrieve JSON data from a 3rd party API. I have no control over the API data structures or functionality.
Several of the calls I make will return multiple 'pages' of data. The data is a collection of objects of a certain type e.g. User.
I have created classes in my app to match the various data types from the API.
public class User
{
[JsonProperty("id")]
public int ID { get; set; }
[JsonProperty("first_name")]
public string FirstName { get; set; }
[JsonProperty("last_name")]
public string LastName { get; set; }
}
public class FooBar
{
[JsonProperty("foo")]
public string Foo { get; set; }
[JsonProperty("bar")]
public string Bar { get; set; }
}
The API response is always in the same format for these calls. While the actual object types in the "data" array will differ depending on what call has been made.
{
"paging":{"page":1},
"data":[{<object>}, {<object>}, {<object>},...]
}
I have created a class to try to deserialize these. The dynamic[] type for the Data property is for illustrative purposes and I am happy to change it if there is a better approach.
public class ApiResponseObject
{
[JsonProperty("paging")]
public Paging PagingInfo { get; set; }
[JsonProperty("data")]
public dynamic[] Data { get; set; }
}
And I would like to have the Data collection resolve to the appropriate type for the objects it contains. e.g.
string userJson = "{\"paging\":{\"page\":1},\"data\":[{\"id\":1,\"first_name\":\"Joe\",\"last_name\":\"Bloggs\"},{\"id\":2,\"first_name\":\"Jane\",\"last_name\":\"Doe\"}]}"; // json string would come from API
string foobarJson = "{\"paging\":{\"page\":1},\"data\":[{\"foo\":\"Lorem\",\"bar\":\"Ipsum\"},{\"foo\":\"Dolor\",\"bar\":\"Amet\"}]}";
var userResponse = JsonConvert.DeserializeObject<ApiResponseObject>(userJson);
var foobarResponse = JsonConvert.DeserializeObject<ApiResponseObject>(foobarJson);
The deserialization succeeds but the Data collection is of type JObject and cannot be cast into the correct type (User, FooBar).
I am trying to avoid having to write specific response object classes for each request if possible.
I will know what type of object I am expecting in the collection when I am requesting it so I could pass that type to the deserializer but I'm not clear on how to achieve that in this particular scenario.
Something like the below psuedo code would be ideal.
var userResponse = JsonConvert.DeserializeObject<ApiResponseObject<User>>(userJson);
Thanks for your help!
You can use the generic type T, like this :
public class ApiResponseObject<T>
{
[JsonProperty("paging")]
public Paging PagingInfo { get; set; }
[JsonProperty("data")]
public T[] Data { get; set; }
}
I have a web service that is outputting JSON in the form
{"AppointmentList":[{"AppointmentList":{"id":"1","MeetingId":"1","MeetingName":"Test Meeting 1","Length":"90","Room":"B2C","DateTimeFrom":"1st Sept 2016","Venue":"The old pub","DateCreated":"2016-08-30 00:00:00","DateDue":"2016-09-01 00:00:00","UserId":"JohnsonPa"}},{"AppointmentList":{"id":"2","MeetingId":"2","MeetingName":"Test Meeting 2","Length":"60","Room":"B2C","DateTimeFrom":"11th Sept 2016","Venue":"The old pub","DateCreated":"2016-09-01 00:00:00","DateDue":"2016-09-12 00:00:00","UserId":"JohnsonPa"}...}]}
I am trying to deserialise this in to List. Normally, I would have a Base Class that would contain a property List AppointmentList {get; set;}, however, that would mean that I can't use type T and need a pile of duplicate code for each class.
I can certainly create BaseClass with a property public List Data {get; set;} however, as the JSON won't deserialise to Data (incorrect name) and the JSON PropertyName can't be set to the class name derived from typeof(T).ToString().
Is there a way to achieve what I'm trying to do without resorting to lots of code duplication?
I've tried casting the deserialiser to JArray and creating a reader from that, but this throws an exception.
Im not sure if this is exactly what you need, but maybe something like this would work? It allows you to successfully deserialize to a JArray like you state you tried at the end of your question.
JArray result = JsonConvert.DeserializeObject<dynamic>(json).AppointmentList;
Here how to convert it to List<object>
dynamic data = JsonConvert.DeserializeObject(json);
JArray array = data.AppointmentList;
List<object> objectList = array.ToObject<List<object>>();
What is wrong with generics? If you want a schemaless data structure use JObject or dynamic if not you can try this.
class Program
{
public const string json = #"{""AppointmentList"":[{""AppointmentList"":{""id"":""1"",""MeetingId"":""1"",""MeetingName"":""Test Meeting 1"",""Length"":""90"",""Room"":""B2C"",""DateTimeFrom"":""1st Sept 2016"",""Venue"":""The old pub"",""DateCreated"":""2016-08-30 00:00:00"",""DateDue"":""2016-09-01 00:00:00"",""UserId"":""JohnsonPa""}},{""AppointmentList"":{""id"":""2"",""MeetingId"":""2"",""MeetingName"":""Test Meeting 2"",""Length"":""60"",""Room"":""B2C"",""DateTimeFrom"":""11th Sept 2016"",""Venue"":""The old pub"",""DateCreated"":""2016-09-01 00:00:00"",""DateDue"":""2016-09-12 00:00:00"",""UserId"":""JohnsonPa""}}]}";
static void Main(string[] args)
{
var items = Newtonsoft.Json.JsonConvert.DeserializeObject<AppointmentItemList<Meeting1>>(json).GetList();
var items2 = Newtonsoft.Json.JsonConvert.DeserializeObject<AppointmentItemList<Meeting2>>(json).GetList();
Console.ReadLine();
}
public class AppointmentItemList<T>
{
public List<AppointmentItem> AppointmentList { get; set; }
public class AppointmentItem
{
public T AppointmentList { get; set; }
}
public IList<T> GetList()
{
return AppointmentList.Select(al => al.AppointmentList).ToList();
}
}
public class Meeting1
{
[Newtonsoft.Json.JsonProperty("id")]
public string Id { get; set; }
public string MeetingName { get; set; }
}
public class Meeting2
{
[Newtonsoft.Json.JsonProperty("id")]
public string Id { get; set; }
public string Room { get; set; }
}
}
I am new in C# and I know there are hundreds of examples on the google for Json deserialization. I tried many but could not understand how C# works for deserialization.
using (var client = new WebClient())
{
client.Headers.Add("Content-Type", "text/json");
result = client.UploadString(url, "POST", json);
}
result looks like this:
{"Products":[{"ProductId":259959,"StockCount":83},{"ProductId":420124,"StockCount":158}]}
First I created a class:
public class ProductDetails
{
public string ProductId { get; set; }
public string StockCount { get; set; }
}
Then I tried to deserialize using this statement but couldn't understand.
var jsonresult = JsonConvert.DeserializeObject<ProductDetails>(result);
Debug.WriteLine(jsonresult.ProductId);
The above worked fine in visual basic with the following code but how to do this similar in C#
Dim Json As Object
Set Json = JsonConverter.ParseJson(xmlHttp.responseText)
For Each Product In Json("Products")
Debug.Print = Product("ProductId")
Debug.Print = Product("StockCount")
Next Product
You should use:
public class Product
{
public int ProductId { get; set; }
public int StockCount { get; set; }
}
public class RootObject
{
public List<Product> Products { get; set; }
}
var jsonresult = JsonConvert.DeserializeObject<RootObject>(result);
Because your JSON contains list of products, in jsonresult you have list of Product.
If you want get Product you can use eg. foreach
foreach(Product p in jsonresult.Products)
{
int id = p.ProductId;
}
Your JSON reads "an object that has a property named Products which contains an array of objects with properties ProductId and StockCount". Hence,
public class Inventory
{
public ProductDetails[] Products { get; set; }
}
var inventory = JsonConvert.DeserializeObject<Inventory>(result);
Your C# code cannot work because your json string contains values for 2 Product objects. As a result your var jsonresult variable will contain an array of Product objects, not one.
It is obvious in your VB code as you need to loop the Json variable in order to acquire each Product object.
Still your C# code would work if you string contained values for only one object like this:
{"ProductId" = 420124,"StockCount" = 158}
as you can see here http://www.newtonsoft.com/json/help/html/SerializingJSON.htm
Also you can try json parsing with JObject class, check this out: http://www.newtonsoft.com/json/help/html/t_newtonsoft_json_linq_jobject.htm
So I have this object:
public class JournalItem
{
public string Description { get; set; }
public bool IsShared { get; set; }
public bool IsDeleted { get; set; }
public bool IsGroup { get; set; }
public Guid Id { get; set; }
public List<JournalItem> ChildEntities { get; set; }
}
It has a list of the same type of object there, ChildEntitites. I've got a page that posts an array of these back to the server as Json. Here's the Json it returns:
[{"Description":"Develop social skills","Id":"d48749ea-2b50-4563-b47c-f2014b08c53a","IsShared":false,"IsDeleted":false,"IsGroup":false,"ChildEntitites":[]},{"Description":"Be more like Joel D.","Id":"a18749ea-2b50-4563-b47c-f2014b08d123","IsShared":true,"IsDeleted":false,"IsGroup":true,"ChildEntitites":[{"Description":"Wear cool glasses","Id":"77c56855-5626-4107-bc82-5862ccdb0943","IsShared":false,"IsDeleted":false,"IsGroup":false,"ChildEntitites":[]},{"Description":"Get 16GB of RAM","Id":"82081eab-b4ce-41fe-bcec-22178b7ed8e6","IsShared":false,"IsDeleted":false,"IsGroup":false,"ChildEntitites":[]}]},{"Description":"Nested group 1","Id":"9495f718-9e7b-4936-b1bf-112d1e7d3ef5","IsShared":false,"IsDeleted":false,"IsGroup":true,"ChildEntitites":[{"Description":"Nested group 2","Id":"70a7e919-1253-4dbd-b41b-49d8bd599657","IsShared":false,"IsDeleted":false,"IsGroup":true,"ChildEntitites":[{"Description":"Nested group 3","Id":"77bfcb11-cba2-48a9-8a1b-b4e0c9b1c5e1","IsShared":false,"IsDeleted":false,"IsGroup":true,"ChildEntitites":[{"Description":"Very nested objective","Id":"274c786b-d09c-4228-a18a-629d4ca9aed3","IsShared":false,"IsDeleted":true,"IsGroup":false,"ChildEntitites":[]}]}]}]}]
Here's how I'm using JavaScriptSerilaiazer to conver it to an actual object:
var ser = new JavaScriptSerializer();
var journalStructure = ser.Deserialize<List<JournalItem>>(journalJson);
(I've also tried NewtonSoft with the same result)
This should give me an array of 3 items (which it does). The first item shouldn't have any ChildEntities, but the second and third should have another list of JournalItems as their ChildEntities, but those are also both null.
How can I get one of these serializer things to deserialize the json array as a list? Can I do that?
It should work if you change ChildEntities to ChildEntitites (your json string contains this)
Both Json.net and JavaScriptSerializer work.