I'm using json.net to serialize an object to a json string. Now I have a list of Objects which I like to serialize into a Json array. However, I'm unable to do that with json.net and hope someone can point out my mistake.
I have the following classes:
class PeopleList {
public Person inputs { get; set; }
}
class Person {
public String name { get; set; }
public int age { get; set; }
}
I'm using the following code to serialize the objects:
var json = new List<PeopleList>();
Person p1 = new Person { name = "Name 1", age = 20 };
json.Add(new PeopleList { inputs = p1 });
Person p2 = new Person { name = "Name 2", age = 30 };
json.Add(new PeopleList { inputs = p2 });
string jsonString = JsonConvert.SerializeObject(json, Formatting.None, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore, Formatting = Formatting.Indented });
This gives me the following output:
[
{
"inputs": {
"name": "Name 1",
"age": 20
}
},
{
"inputs": {
"name": "Name 2",
"age": 30
}
}
]
Here is what I actually want:
[
{
"inputs": [
{
"name": "Name 1",
"age": 20
}
]
},
{
"inputs": [
{
"name": "Name 2",
"age": 30
}
]
}
]
As you see I need every object in my list encapsulated with []. How can I achieve that with Json.net? Thanks!
If you want your inputs to be an array, you need to declare it as an array in your object :
class PeopleList {
public List<Person> inputs { get; set; }
}
Then you can use it :
var json = new List<PeopleList>();
List<Person> p1 = new List<Person> { new Person { name = "Name 1", age = 20 } };
json.Add(new PeopleList { inputs = p1 });
List<Person> p2 = new List<Person> { new Person { name = "Name 2", age = 30 } };
json.Add(new PeopleList { inputs = p2 });
string jsonString = JsonConvert.SerializeObject(json, Formatting.None, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore, Formatting = Formatting.Indented });
based on your output and what you want you probably want to do something like this
Json2CSharpClass Converter
public class Person
{
public string name { get; set; }
public int age { get; set; }
}
public class PeopleList
{
public List<Person> inputs { get; set; }
}
Related
We have a project which using System.Text.Json in .NET 5 instead of Newtonsoft JObject. Using Newtonsoft, it is pretty easy to replace dynamic JSON data e.g. as shown below:
siteDataObject["student"] = JArray.FromObject(studentservice.GetStudents());
When studentservice.GetStudents() is return List as below structure
internal class Student {
public int Id { get; set; }
public string Name { get; set; }
public string ContactPhone { get; set; }
public IEnumerable<MedicalRecord> MedicalRecords { get; set; }
}
internal class MedicalRecord {
public int Id { get; set; }
public string Name { get; set; }
public DateTime RecordDate { get; set; }
public IEnumerable<DiseaseLog> DiseaseLogs{ get; set; }
}
internal class DiseaseLog {
public int Id { get; set; }
public string Name { get; set; }
public DateTime LogDate { get; set; }
}
but in System.Text.Json
foreach (var element in doc.RootElement.EnumerateObject()) {
if (element.Name == "student") {
writer.WritePropertyName(element.Name);
}
else {
element.WriteTo(writer);
}
}
I don't know how to convert List<student> into JSON array data, when student class have many properties with multi collection inside.
Can anyone advise how to convert it ?
To clarify, I need to propose the full code for this, I have a dynamic json string and want to replace element : students into new record, the code will be
var dynamicJson = #"{'roomid':1,'roomcode':'Code001','students':[1],'contentdata':'say hello','footerdata':'cookie policy'}";
using MemoryStream stream = new MemoryStream();
using Utf8JsonWriter writer = new Utf8JsonWriter(stream);
using var dynamicDocument = JsonDocument.Parse(dynamicJson);
writer.WriteStartObject();
foreach (var element in dynamicDocument.RootElement.EnumerateObject())
{
if (element.Name == "students")
{
// unknown how to modify the student record into array
}
else
element.WriteTo(writer);
}
writer.WriteEndObject();
stream.Flush();
var modifyJson = Encoding.UTF8.GetString(stream.ToArray());
I know how to modify student value , if student element is string, but I don't know how to modify it into array, by using simple code. As student have multi class inside.
My expected result should be
{
"roomid": 1,
"roomcode": "Code001",
"students": [
{
"id": 1,
"Name": "Wilson",
"ContactPhone": "123-122-3311",
"MedicalRecords": [
{
"id": 101,
"Name ": "Medial record 101011",
"RecordDate": "2021-12-31",
"DiseaseLogs": [
{
"id": 18211,
"Name ": "Patient Log 19292",
"LogDate": "2020-1-31"
},
{
"id": 18212,
"Name ": "Patient Log 2911w",
"LogDate": "2020-3-31"
}
]
}
]
}
],
"contentdata": "say hello",
"footerdata": "cookie policy"
}
In .NET 5 there is no modifiable JSON Document Object Model built into to System.Text.Json. JsonDocument is read-only, and System.Text.Json.Nodes was only introduced in .NET 6. Thus, the easiest way to deserialize, modify and re-serialize free-form JSON in .NET 5 is to deserialize to some partial data model, with unknown values bound into a dictionary.
If you do not care about the order of properties at the root level, you could deserialize to a model with a public object students { get; set; } property, and bind the remaining elements to a JsonExtensionData overflow dictionary:
public class RootObject
{
public object students { get; set; }
[System.Text.Json.Serialization.JsonExtensionDataAttribute]
public IDictionary<string, object> ExtensionData { get; set; }
}
Then deserialize, modify and re-serialize as follows:
var students = new List<Student> { /* Initialize these as required... */ };
var dynamicJson = #"{""roomid"":1,""roomcode"":""Code001"",""students"":[1],""contentdata"":""say hello"",""footerdata"":""cookie policy""}";
var root = JsonSerializer.Deserialize<RootObject>(dynamicJson);
root.students = students;
var modifyJson = JsonSerializer.Serialize(root, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase, WriteIndented = true });
Which results in
{
"students": [
{
"id": 1,
"name": "Wilson",
"contactPhone": "123-122-3311",
"medicalRecords": [
{
"id": 101,
"name": "Medial record 101011",
"recordDate": "2021-12-31T00:00:00",
"diseaseLogs": [
{
"id": 18211,
"name": "Patient Log 19292",
"logDate": "2020-01-31T00:00:00"
},
{
"id": 18212,
"name": "Patient Log 2911w",
"logDate": "2020-03-31T00:00:00"
}
]
}
]
}
],
"roomid": 1,
"roomcode": "Code001",
"contentdata": "say hello",
"footerdata": "cookie policy"
}
the students property must be declared as object because the input JSON already has an array containing a single integer value; declaring it as public List<Student> students { get; set; } would result in a deserialization when initially loading the JSON.
Demo fiddle #1 here.
If you do care about the order of properties at the root level, you could deserialize to an OrderedDictionary (an old order-preserving non-generic dictionary dating from .NET Framework 2.0 which is still around and supported), overwrite the "students" value, and re-serialize:
var students = new List<Student> { /* Initialize these as required... */ };
var dynamicJson = #"{""roomid"":1,""roomcode"":""Code001"",""students"":[1],""contentdata"":""say hello"",""footerdata"":""cookie policy""}";
var root = JsonSerializer.Deserialize<OrderedDictionary>(dynamicJson);
root["students"] = students;
var modifyJson = JsonSerializer.Serialize(root, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase, WriteIndented = true });
Which results in
{
"roomid": 1,
"roomcode": "Code001",
"students": [
{
"id": 1,
"name": "Wilson",
"contactPhone": "123-122-3311",
"medicalRecords": [
{
"id": 101,
"name": "Medial record 101011",
"recordDate": "2021-12-31T00:00:00",
"diseaseLogs": [
{
"id": 18211,
"name": "Patient Log 19292",
"logDate": "2020-01-31T00:00:00"
},
{
"id": 18212,
"name": "Patient Log 2911w",
"logDate": "2020-03-31T00:00:00"
}
]
}
]
}
],
"contentdata": "say hello",
"footerdata": "cookie policy"
}
Demo fiddle #2 here.
In .NET 6 this all becomes easier through use of the System.Text.Json.Nodes editable JSON Document Object Model:
var dynamicJson = #"{""roomid"":1,""roomcode"":""Code001"",""students"":[1],""contentdata"":""say hello"",""footerdata"":""cookie policy""}";
var nodes = JsonSerializer.Deserialize<JsonObject>(dynamicJson);
nodes["students"] = JsonSerializer.SerializeToNode(students, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
var modifyJson = nodes.ToString();
But in .NET 5 this is not possible. Demo fiddle #3 here.
I think this is what you want (array or single nested object):
var student = new Student()
{
Name = "Student",
ContactPhone = "contact",
Id = 1,
MedicalRecords = new List<MedicalRecord>()
{
new MedicalRecord()
{
Name = "Medical Record 1",
RecordDate= DateTime.Now ,
Id = 1 ,
MedicalRecords = new List<DiseaseLog>()
{
new DiseaseLog(){ Name = "some disease" ,
LogDate = DateTime.Now, Id =1 }
}
}
}
};
var data = System.Text.Json.JsonSerializer.Serialize(student);
Console.WriteLine(data);
var list = new List<Student>();
list.Add(student);
var arrayData = System.Text.Json.JsonSerializer.Serialize(list);
Console.WriteLine(arrayData);
I have below class structures,
public class Student
{
public int Id { get; set; }
public string Name { get; set; }
}
public class Message
{
public int Size { get; set; } = 10;
public Student Student { get; set; }
}
Now I have list of messages like,
var messages = new List<Message>
{
new Message{ Size=10, Student=new Student{Id=1, Name="N1" } },
new Message{ Size=20, Student=new Student{Id=2, Name="N2" } }
};
which I want to write in JSON using Newtonsoft.Json,
using (var f = File.CreateText("C:\\Temp\\test.json"))
{
f.Write(JsonConvert.SerializeObject(messages));
}
This give below JSON output,
[
{
"Size": 10,
"Student": {
"Id": 1,
"Name": "N1"
}
},
{
"Size": 20,
"Student": {
"Id": 2,
"Name": "N2"
}
}
]
But I would like below output (without size and only one time root element student),
{
"Student": [
{
"Id": 1,
"Name": "N1"
},
{
"Id": 2,
"Name": "N2"
}
]
}
whats need to be done here? Thanks!
You need to refine your data to get desired result
first
var refindedResult = new { Students = messages.Select(m => m.Student) };
second pass it to json convertor
using (var f = File.CreateText("C:\\Temp\\test.json"))
{
f.Write(JsonConvert.SerializeObject(refindedResult ));
}
You can try to write a StudentModel class.
public class StudentModel
{
public IEnumerable<Student> Student { get; set; }
}
use linq get student collection from messages, then SerializeObject on it.
var res = new StudentModel()
{
Student = messages.Select(x => x.Student)
};
var json = JsonConvert.SerializeObject(res);
//f.Write(JsonConvert.SerializeObject(messages));
f.Write(JsonConvert.SerializeObject(messages.Select(m => m.Student)));
or, when you want a root object (Students, not Student)
f.Write(JsonConvert.SerializeObject(
new { Students = messages.Select(m => m.Student) } ));
var singleItems = new List<Products>();
singleItems.Add(new Products() { product_id = 1, title = "Bryon Hetrick", price = 50 });
singleItems.Add(new Products() { product_id = 2, title = "Nicole Wilcox", price = 20 });
var serializer = new JavaScriptSerializer();
var serializedResult = serializer.Serialize(serializer);
From above example code i am getting Json output like bellow.
[{"product_id":1,"title":"Bryon Hetrick","price":50},
{"product_id":2,"title":"Nicole Wilcox","price":20}]
But my Json need one more value called- "config" also i need whole data formatted exactly like bellow. How to edit my c# code to achieve that value?
{ "products":[{"product_id":"B071H6TBM5","title":"New Iphone 5S","price":"23.45"},{"product_id":"B071DM968J","title":"Iphone 4 old","price":"23.45"}],"config":{"token":"","Site":"Us","Mode":"ListMyItem"}}
You could make a Config class with the properties you require and then a composite class with Prodcuts and Config, i.e. ProductConfig:
public class Products
{
public string product_id { get; set; }
public string title { get; set; }
public string price { get; set; }
}
public class Config
{
public string token { get; set; }
public string site { get; set; }
public string mode { get; set; }
}
public class ProductConfig
{
public List<Products> Products { get; set; }
public Config Config { get; set; }
}
You can then create/populate the ProductConfig class with the new properties.
public string SerializeProductConfig()
{
ProductConfig pc = new ProductConfig();
pc.Config = new Config { token = "DDTest", site = "US", mode = "Test Mode" };
pc.Products = new List<Products>();
pc.Products.Add(new Products() { product_id = "1", title = "Bryon Hetrick", price = "50" });
pc.Products.Add(new Products() { product_id = "2", title = "Nicole Wilcox", price = "20" });
var serializer = new JavaScriptSerializer();
return serializer.Serialize(pc);
}
and serialize the ProductConfig object using the JavaScript serializer or NewtonSoft which will give you the following JSON
{ // ProductConfig
"Products": [
{
"product_id": "1",
"title": "Bryon Hetrick",
"price": "50"
},
{
"product_id": "2",
"title": "Nicole Wilcox",
"price": "20"
}
],
"config": {
"token": "DDTest",
"site": "US",
"mode": "Test Mode"
}
}
I am trying to instantiate a poco object with data in a .json file in my VS project. When I use this code, it just returns an empty object.
Class:
public class Person
{
public int id { get; set; }
public string name { get; set; }
}
Json text in in file:
{
"person":
{
"id": 1,
"name": "joe"
}
}
Code in Program.cs:
static void Main(string[] args)
{
string jspath = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), #"Json\json1.json");
//person object results in 0 for id and null for name (empty)
Person person = new JavaScriptSerializer().Deserialize<Person>(File.ReadAllText(jspath ));
}
What am I doing wrong?
Your JSON file is not correct.
It should be:
{ "id": 1, "name": "joe" }
Proof:
Person p = new Person
{
id = 1,
name = "joe"
};
var sb = new StringBuilder();
new JavaScriptSerializer().Serialize(p, sb);
Console.WriteLine(sb.ToString()); // Outputs: { "id": 1, "name": "joe" }
I need to convert following Employee.cs class in json format,for that i wrote following code
//Employee.cs(In class file)
public class Employee
{
public string Name { get; set; }
public string Job { get; set; }
public string City { get; set; }
}
//In my MyPage.aspx page
Employee oEmployee1 =
new Employee { Name = "Pini", Job = "111", City = "30" };
Employee oEmployee2 =
new Employee { Name = "Yaniv", Job = "Developer", City = "Hyd" };
Employee oEmployee3 =
new Employee { Name = "Yoni", Job = "Developer", City = "Bglre" };
List<Employee> oList = new List<Employee>() { oEmployee1, oEmployee2, oEmployee3 };
System.Web.Script.Serialization.JavaScriptSerializer oSerializer =new System.Web.Script.Serialization.JavaScriptSerializer();
string sJSON = oSerializer.Serialize(oList);
Response.Write("<pre>"+sJSON+"</pre>");
I got following output:
[{"Name":"Pini","Job":"111","City":"30"},{"Name":"Yaniv","Job":"Developer","City":"Hyd"},{"Name":"Yoni","Job":"Developer","City":"Bglre"}]
Is it any other way to convert to json format more effectively and i want to beautify json output
I would use JSON.NET Serializer with Formatting.Indented like below
string result= JsonConvert.SerializeObject(obj, Formatting.Indented);
Output
[
{
"Name": "Pini",
"Job": "111",
"City": "30"
},
{
"Name": "Yaniv",
"Job": "Developer",
"City": "Hyd"
},
{
"Name": "Yoni",
"Job": "Developer",
"City": "Bglre"
}
]
list<Employee> oEmployee=
{
new Employee() { Name = "Pini", Job = "111", City = "30" },
new Employee() { Name = "Pini", Job = "111", City = "30" },
new Employee() { Name = "Pini", Job = "111", City = "30" },
};
var oSerializer=new JavaScriptSerializer();
string sJSON = oSerializer.Serialize(oList);
Response.Write("<pre>"+sJSON+"</pre>");
add the System.Web.Script.Serialization reference
add refer this link
http://matijabozicevic.com/blog/csharp-net-development/csharp-serialize-object-to-json-format-using-javascriptserialization