I've looked and can't find anything and this is really starting to annoy me...
I've got JSON.Net and the following snippet of code
var x = insList.Select(a => new
{
ac = a.CreatedDate,
bd = a.CreatedBy
});
this.Context.Response.Write(x.ToJSON());
.ToJSON() is a simple extension method:
public static string ToJSON(this object obj)
{ return JsonConvert.SerializeObject(obj); }
The json output is
Ideally what I'd like is the highlight bits to have the same root name, rather than just {}
Can anyone help please?
Objects do not have names in JSON, properties do. (See JSON.org.) Therefore, if you want to name an object, you'll have to make it the value of a property of another containing object.
var x = insList.Select(a => new
{
rootName = new
{
ac = a.CreatedDate,
bd = a.CreatedBy
}
});
This will yield the following JSON:
[
{
"rootName": {
"ac": "0001-01-01T00:00:00",
"bd": 0
}
},
{
"rootName": {
"ac": "0001-01-01T00:00:00",
"bd": 0
}
},
{
"rootName": {
"ac": "0001-01-01T00:00:00",
"bd": 0
}
}
]
Related
update:
In newtonsoft, it works fine like this.
var saveObject = Newtonsoft.Json.JsonConvert.SerializeObject(root, Newtonsoft.Json.Formatting.Indented);
var root2 = Newtonsoft.Json.JsonConvert.DeserializeObject<Node>(saveObject);
Here, the entire "tree"/graph is reloaded into root2. Is this behaviour accomplishable with System.Text.Json?
original question:
I have a data model (more precisely a DOM) where I have been using BinaryFormatter to serialize and deserialize the entire graph of connected various objects. It has worked flawless for years. Now, the binaryFormatter has been deprecated, and Microsoft appears to suggest that one should use Json for the job.
Using System.Text.Json serializing the dom, the entire graph is serialized easily, however, when deserializing, only the root level node is deserialized. Any objects hanging on the root node is not deserialized. What am I missing to reload the entire graph? Annotations on the list property? Could anyone guide me to a good example? Or, any other good suggestions to save a dom on disc? Thank you.
using System.Text.Json;
var root = new Node("root");
var a1 = new Node("a1");
var a2 = new Node("a2");
var b11 = new Node("b11");
var b12 = new Node("b12");
var b21 = new Node("b21");
var b22 = new Node("b22");
root.Nodes.Add(a1);
root.Nodes.Add(a2);
a1.Nodes.Add(b11);
a1.Nodes.Add(b12);
a2.Nodes.Add(b21);
a2.Nodes.Add(b22);
var options = new JsonSerializerOptions { WriteIndented = true, };
string saveFile = JsonSerializer.Serialize(root,options);
Console.WriteLine("Savefile:");
Console.WriteLine(saveFile);
var loadFile = JsonSerializer.Deserialize<Node>(saveFile,options)!;
Console.WriteLine();
Console.WriteLine("Loadfile:");
Console.WriteLine(loadFile);
public class Node
{
public Node(string name)
{
Name = name;
}
public string Name { get; set; }
public List<Node> Nodes { get; set; } = new List<Node>();
}
Output:
Savefile:
{
"Name": "root",
"Nodes": [
{
"Name": "a1",
"Nodes": [
{
"Name": "b11",
"Nodes": []
},
{
"Name": "b12",
"Nodes": []
}
]
},
{
"Name": "a2",
"Nodes": [
{
"Name": "b21",
"Nodes": []
},
{
"Name": "b22",
"Nodes": []
}
]
}
]
}
Loadfile:
Node
Hope anybody could guide me here. I spend some hours on it and can't understand what's going on.
Mission: Replace a json element by a jsonpath search tag. (sort of $ref feature)
In my code example below i want to replace the value of DataReaderUser by a value found by the json path search $.UsersAndGroups.Users[?(#.Name == 'OMDASAccountUser')].Username . In this case it should result in the value "contoso\SVCSCOM-DO-OMDAS"
The code below works as expected.. the issue is below this code ..
https://dotnetfiddle.net/gEjggK
using System;
using Newtonsoft.Json.Linq;
public class Program
{
public static void Main()
{
string json = #"{
""SQLServer"": {
""SQLReportingServices"": {
""AccountSettings"": {
""DataReaderUser"": {""$JsonPath"": ""$.UsersAndGroups.Users[?(#.Name == 'OMDASAccountUser')].Username""},
}
}
},
""UsersAndGroups"": {
""Users"": [
{
""Name"": ""OMActionAccountUser"",
""Username"": ""contoso\\SVCSCOM-DO-OMDAS"",
},
{
""Name"": ""OMDASAccountUser"",
""Username"": ""contoso\\SVCSCOM-DO-OMDAS"",
}
]
}
}";
JObject jo = JObject.Parse(json);
var JsonPath = jo.SelectToken("..$JsonPath");
JsonPath.Parent.Parent.Replace(jo.SelectToken(JsonPath.ToString()));
Console.WriteLine(jo.ToString());
}
}
The output will be :
{
"SQLServer": {
"SQLReportingServices": {
"AccountSettings": {
"DataReaderUser": "contoso\\SVCSCOM-DO-OMDAS"
}
}
},
"UsersAndGroups": {
"Users": [
{
"Name": "OMActionAccountUser",
"Username": "contoso\\SVCSCOM-DO-OMDAS"
},
{
"Name": "OMDASAccountUser",
"Username": "contoso\\SVCSCOM-DO-OMDAS"
}
]
}
}
Now the issue:
I want to do the same for all possible jsonpaths refers. So i use the SelectTokens and an foreach . But it looks like the behavior is different , the parents are null.
https://dotnetfiddle.net/lZW3XP
using System;
using Newtonsoft.Json.Linq;
public class Program
{
public static void Main()
{
string json = #"{
""SQLServer"": {
""SQLReportingServices"": {
""AccountSettings"": {
""DataReaderUser"": {""$JsonPath"": ""$.UsersAndGroups.Users[?(#.Name == 'OMDASAccountUser')].Username""},
}
}
},
""UsersAndGroups"": {
""Users"": [
{
""Name"": ""OMActionAccountUser"",
""Username"": ""contoso\\SVCSCOM-DO-OMDAS"",
},
{
""Name"": ""OMDASAccountUser"",
""Username"": ""contoso\\SVCSCOM-DO-OMDAS"",
}
]
}
}";
JObject jo = JObject.Parse(json);
var JsonPaths = jo.SelectTokens("..$JsonPath");
foreach (var JsonPath in JsonPaths )
{
JsonPath.Parent.Parent.Replace(jo.SelectToken(JsonPath.ToString()));
}
Console.WriteLine(jo.ToString());
}
}
And the output:
Run-time exception (line 34): Object reference not set to an instance of an object.
Stack Trace:
[System.NullReferenceException: Object reference not set to an instance of an object.]
at Newtonsoft.Json.Linq.JsonPath.PathFilter.GetNextScanValue(JToken originalParent, JToken container, JToken value)
at Newtonsoft.Json.Linq.JsonPath.ScanFilter.<ExecuteFilter>d__4.MoveNext()
at Program.Main() :line 34
would be great to get some directions since i am spinning my head here.
michel
SelectTokens uses lazy evaluation and if you modify the token while enumerating all matches it can break in unexpected ways. A simple fix is to add ToArray() to force eager evaluation:
var JsonPaths = jo.SelectTokens("..$JsonPath").ToArray();
I have followed an example shown here
link
And i got the hang of it, i managed to create my own "Employee" entity and i found some dummy api data online to play with.
like this Problem is, the tornadofx throws null pointer error, and i think its because the rest response sends something like this
{
"status": "success",
"data": [
{
"id": "1",
"employee_name": "Tiger Nixon",
"employee_salary": "320800",
"employee_age": "61",
"profile_image": ""
},
but when i use mocky and provide JUST the json part
[
{
"id": "1",
"employee_name": "Tiger Nixon",
"employee_salary": "320800",
"employee_age": "61",
"profile_image": ""
},...]
it all works fine.
I think those additional fields "status" and "success" in response confuse the rest client of tornadofx, and i cant manage to get it to work, is there anyway to tell client to ignore every other fields besides those of json data.
All links are functional, so you can try yourself.
full working example
package com.example.demo.view
import javafx.beans.property.SimpleIntegerProperty
import javafx.beans.property.SimpleStringProperty
import javafx.scene.layout.BorderPane
import tornadofx.*
import javax.json.JsonObject
class Employee (id:Int?=null , name: String? = null, age: Int?=null): JsonModel {
val idProperty = SimpleIntegerProperty(this, "id")
var id by idProperty
val ageProperty = SimpleIntegerProperty(this, "age")
var age by ageProperty
val employeeNameProperty = SimpleStringProperty(this, "name", name)
var name by employeeNameProperty
override fun updateModel(json: JsonObject) {
with(json) {
id = int("id")!!
age = int("employee_age")!!
name = string("employee_name")
}
}
override fun toJSON(json: JsonBuilder) {
with(json) {
add("id", id)
add("employee_name", name)
add("employee_age", age)
}
}
}
class PersonEditor : View("Person Editor") {
override val root = BorderPane()
val api : Rest by inject()
var persons = listOf(Employee(1,"John", 44), Employee(2,"Jay", 33)).observable()
val model = PersonModel(Employee())
init {
api.baseURI = "https://run.mocky.io/v3/"
val response = api.get("f17509ba-2d12-4c56-b441-69ab23302e43")
println(response.list())
println(response.list().toModel<Employee>()[0].name)
// print( p.get(1))
with(root) {
center {
tableview(response.list().toModel<Employee>()) {
column("Id", Employee::idProperty)
column("Name", Employee::employeeNameProperty)
column("Age", Employee::ageProperty)
// Update the person inside the view model on selection change
model.rebindOnChange(this) { selectedPerson ->
item = selectedPerson ?: Employee()
}
}
}
right {
form {
fieldset("Edit person") {
field("Id") {
textfield(model.id)
}
field("Name") {
textfield(model.name)
}
field("Age") {
textfield(model.age)
}
button("Save") {
enableWhen(model.dirty)
action {
save()
}
}
button("Reset").action {
model.rollback()
}
}
}
}
}
}
private fun save() {
// Flush changes from the text fields into the model
model.commit()
// The edited person is contained in the model
val person = model.item
// A real application would persist the person here
println("Saving ${person.employeeNameProperty} / ${person.ageProperty}")
}
}
class PersonModel(person: Employee) : ItemViewModel<Employee>(person) {
val id = bind(Employee::idProperty)
val name = bind(Employee::employeeNameProperty)
val age = bind(Employee::ageProperty)
}
if you replace base url and send request to http://dummy.restapiexample.com/api/v1/employees you will get an error that i am talking about
Your call to mocky returns a list, so .list() works fine. Your call to restapiexample, however, returns an object, not a list, so .list() won't do what you expect. You can probably use something like this, though I haven't tested it:
response.one().getJsonArray("data").toModel<Employee>()[0].name)
Further explanation:
If you're not familiar with the structure of JSON, check out the diagrams on the JSON homepage.
TornadoFX has two convenience functions for working with JSON returns: .list() and .one(). The .list() function will check if the result is a JsonArray. If so, it simply returns it. If it is instead a JsonObject, it wraps that object in a list and returns the new list.
In your case, since restapiexample is returning an object, the result of your call to .list() is a JsonArray with a single object. It looks something like this:
[
{
"status": "success",
"data": [...]
}
]
Obviously that single object cannot be converted to an Employee, so dereferencing anything off of it will result in a NullPointerException.
The .one() function on the other hand will check if the response is a JsonObject. If it is, it simply returns the object. If, however, the response is a JsonArray, it will take the first item from the array and return that item.
I passed the following object:
var myVar = { typeA: { option1: "one", option2: "two" } }
I want to be able to pull out the key typeA from the above structure.
This value can change each time so next time it could be typeB.
So I would like to know if there is any way to do that
I was able to solve using 'keys'
for a json example like this:
{
"1-0001": {
"name": "red",
"hex": "FF0000"
},
"1-0002": {
"name": "blue",
"hex": "0000FF"
},
"1-0003": {
"name": "green",
"hex": "008000"
}
}
I was able to use
Map<String, dynamic> decoded = json.decode(jsonString);
for (var colour in decoded.keys) {
print(colour); // prints 1-0001
print(decoded[colour]['name']); // prints red
print(decoded[colour]['hex']); // prints FF0000
}
To get all filenames you can use:
var data = ...
var filenames = [];
for(var i = 0; i < data.length; i++) {
var item = data[0]['files'];
var key = item.keys.first;
var filename = item[key]['filename'];
filenames.add(filename);
}
print(filenames);
You need to define a data type.
It is basically a map of (key value-pair) where key is changed as stated in question typeA or typeB
This Object has 2 properties option1 and option2 which is also strings.
Here is the sample code to construct model and how to use it
import 'package:TestDart/TestDart.dart' as TestDart;
main(List<String> arguments) {
var map = new Map<String, MyObject>();
map['typeA'] = new MyObject("one", "two");
map['typeB'] = new MyObject("one", "two");
print(map['typeA'].toString());
print(map['typeA'].toString());
}
class MyObject {
String _option1;
String _option2;
MyObject(this._option1, this._option2);
String get option2 => _option2;
String get option1 => _option1;
#override
String toString() {
return 'MyObject{option1: $_option1, option2: $_option2}';
}
}
Relevant answer
map.forEach((key, value) {
print("Key : ${key} value ${value}");
});
I have a flash app where in a function I have to parse a json passed like an object by some external API that I can't change.
my json look like this:
{
"prodotti": [
{
"titolo": "test",
"marca": "",
"modello": "",
"cilindrata": "",
"potenza": "",
"alimentazione": "",
"images": {
"img": [
{
"thumb": "admin/uploads/img_usato/small/qekabw95L5WH1ALf6.jpg",
"big": "admin/uploads/img_usato/big/qekabw95L5WH1ALf6.jpg"
},
{
"thumb": "admin/uploads/img_usato/small/default.jpg",
"big": "admin/uploads/img_usato/big/default.jpg"
}
]
}
},
{
"titolo": "Motore Volvo TAMD 74 C",
"marca": "VOLVO PENTA",
"modello": "TAMD 74 C",
"cilindrata": "7.283 cm3",
"potenza": "331 kW a 2600 rpm",
"alimentazione": "Gasolio",
"images": {
"img": [
{
"thumb": "admin/uploads/img_usato/small/PmQwN4t4yp7P1YCWa.jpg",
"big": "admin/uploads/img_usato/big/PmQwN4t4yp7P1YCWa.jpg"
},
{
"thumb": "admin/uploads/img_usato/small/BWkjTGcy3pDM2LKRs.jpg",
"big": "admin/uploads/img_usato/big/BWkjTGcy3pDM2LKRs.jpg"
}
]
}
}
]
}
I want to parse the images inside the object.
The API send me an object not astring or json and I have this function now:
function changeData (prodotto:Object) {
img_container.graphics.clear ();
//here I want to enter and take thumb and big of images!!!
for (var index in prodotto.images.img) {
//trace('index: ' + index);
//trace("thumb: " + index.thumb + ' big: ' + index.big);
}
descrizione.htmlText = prodotto.testo_html;
titolo.text = prodotto.titolo;
alimentazione.text = prodotto.alimentazione;
potenza.text = prodotto.potenza;
cilindrata.text = prodotto.cilindrata;
modello.text = prodotto.modello;
marca.text = prodotto.marca;
}
The function works fine but not for the for loop where I try to take the bug and thumb of my json how can I retrieve this information in this object?
Thanks
I think there is something wrong with how you are setting up the call back but since you didn't show code for the api we can't fix that, plus you stated you have no control over it.
No matter what the issue is it just does not seem correct.
I put together a function that will get all the thumbs and bigs.
You did not state otherwise.
function changeData (prodotto:Object) {
for each(var item in prodotto.prodotti){
trace('')
//trace(prodotto.testo_html);
trace(item.titolo);
trace(item.alimentazione);
trace(item.potenza);
trace(item.cilindrata);
trace(item.modello);
trace(item.marca);
for each( var imgs in item.images.img) {
trace('thumb',imgs.thumb)
trace('big',imgs.big)
}
}
}
I think you need to use a JSON parser. Use the one from this link: https://github.com/mikechambers/as3corelib
1: Add the com folder to your project directory or add it to your default class path.
2: Adapt this code to your liking. I am not sure how you're getting a literal object from the API. It really should just be a string unless you're using some sort of AMF. Regardless...
import com.adobe.serialization.json.*;
var data:String = '{"prodotti":[{"titolo":"test","marca":"","modello":"","cilindrata":"","potenza":"","alimentazione":"","images":{"img":[{"thumb":"admin/uploads/img_usato/small/qekabw95L5WH1ALf6.jpg","big":"admin/uploads/img_usato/big/qekabw95L5WH1ALf6.jpg"},{"thumb":"admin/uploads/img_usato/small/default.jpg","big":"admin/uploads/img_usato/big/default.jpg"}]}},{"titolo":"Motore Volvo TAMD 74 C","marca":"VOLVO PENTA","modello":"TAMD 74 C","cilindrata":"7.283 cm3","potenza":"331 kW a 2600 rpm","alimentazione":"Gasolio","images":{"img":[{"thumb":"admin/uploads/img_usato/small/PmQwN4t4yp7P1YCWa.jpg","big":"admin/uploads/img_usato/big/PmQwN4t4yp7P1YCWa.jpg"},{"thumb":"admin/uploads/img_usato/small/BWkjTGcy3pDM2LKRs.jpg","big":"admin/uploads/img_usato/big/BWkjTGcy3pDM2LKRs.jpg"}]}}]}';
function changeData(data)
{
img_container.graphics.clear();
var obj = JSON.decode(data);
for (var i:int = 0; i < obj.prodotti.length; i++)
{
for (var k in obj.prodotti[i].images.img)
{
trace("Thumb:",obj.prodotti[i].images.img[k].thumb);
trace("Big:",obj.prodotti[i].images.img[k].big);
}
descrizione.htmlText = obj.prodotti[i].testo_html;
titolo.text = obj.prodotti[i].titolo;
alimentazione.text = obj.prodotti[i].alimentazione;
potenza.text = obj.prodotti[i].potenza;
cilindrata.text = obj.prodotti[i].cilindrata;
modello.text = obj.prodotti[i].modello;
marca.text = obj.prodotti[i].marca;
}
}
changeData(data);