I want to generate json string like this in C# language
{
"error": "0",
"message": "messages",
"data": {
"version": "sring",
"1": [
{
"keyword": "",
"title": ""
},
{
"keyword": "",
"title": ""
}
],
"2": [
...
],
"3": [
...
]
}
}
there is a problem here, "1":[{},{}],how to generate this part? I'm using asp.net mvc project by the way, I want to return this json string to the client web browser.
This response can be simply generated using Dictionary<string, object> with arrays as values.
public class KeywordTitle
{
public string keyword { get; set; }
public string title { get; set; }
}
public class Response
{
public string error { get; set; }
public string message { get; set; }
public Dictionary<string, object> data { get; set; }
}
var dictionary = new Dictionary<string, object> {
{"version", "sring"}
};
dictionary.Add("1", new []
{
new KeywordTitle { keyword = "", title = "" },
new KeywordTitle { keyword = "", title = "" },
new KeywordTitle { keyword = "", title = "" }
});
JsonConvert.SerializeObject(new Response
{
error = "0",
message = "messages",
data = dictionary
});
It generates:
{
"error" : "0",
"message" : "messages",
"data" : {
"version" : "sring",
"1" : [{
"keyword" : "",
"title" : ""
}, {
"keyword" : "",
"title" : ""
}, {
"keyword" : "",
"title" : ""
}
]
}
}
If it is your API, then it is a good idea to extract version in order to make all objects in data be of the same type, and keys of type int.
Get the Json.NET from NuGet. Then, in your MVC model use this data annotation on your Array property
[JsonProperty(PropertyName="1")]
public string[] YourProperty { get; set }
The PropertyName value is used when you serialize data to JSON.
If you are using Newtonsoft.Json NuGet package, serializing a Dictionary<int, List<MyClass>> will get you what you the expected result.
Use Json.net and add the following attribute to the properties you what to modify the name of:
[JsonProperty(PropertyName = "1")]
public List<ObjectName> Objects { get; set; }
For more information have a look at the serialization attributes.
Related
I have this JSON:
[
{
"Attributes": [
{
"Key": "Name",
"Value": {
"Value": "Acc 1",
"Values": [
"Acc 1"
]
}
},
{
"Key": "Id",
"Value": {
"Value": "1",
"Values": [
"1"
]
}
}
],
"Name": "account",
"Id": "1"
},
{
"Attributes": [
{
"Key": "Name",
"Value": {
"Value": "Acc 2",
"Values": [
"Acc 2"
]
}
},
{
"Key": "Id",
"Value": {
"Value": "2",
"Values": [
"2"
]
}
}
],
"Name": "account",
"Id": "2"
},
{
"Attributes": [
{
"Key": "Name",
"Value": {
"Value": "Acc 3",
"Values": [
"Acc 3"
]
}
},
{
"Key": "Id",
"Value": {
"Value": "3",
"Values": [
"3"
]
}
}
],
"Name": "account",
"Id": "2"
}
]
And I have these classes:
public class RetrieveMultipleResponse
{
public List<Attribute> Attributes { get; set; }
public string Name { get; set; }
public string Id { get; set; }
}
public class Value
{
[JsonProperty("Value")]
public string value { get; set; }
public List<string> Values { get; set; }
}
public class Attribute
{
public string Key { get; set; }
public Value Value { get; set; }
}
I am trying to deserialize the above JSON using the code below:
var objResponse1 = JsonConvert.DeserializeObject<RetrieveMultipleResponse>(JsonStr);
but I am getting this error:
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type
'test.Model.RetrieveMultipleResponse' because the type requires a JSON
object (e.g. {"name":"value"}) to deserialize correctly. To fix this
error either change the JSON to a JSON object (e.g. {"name":"value"})
or change the deserialized type to an array or a type that implements
a collection interface (e.g. ICollection, IList) like List that can
be deserialized from a JSON array. JsonArrayAttribute can also be
added to the type to force it to deserialize from a JSON array. Path
'', line 1, position 1.
Your json string is wrapped within square brackets ([]), hence it is interpreted as array instead of single RetrieveMultipleResponse object. Therefore, you need to deserialize it to type collection of RetrieveMultipleResponse, for example :
var objResponse1 =
JsonConvert.DeserializeObject<List<RetrieveMultipleResponse>>(JsonStr);
If one wants to support Generics (in an extension method) this is the pattern...
public static List<T> Deserialize<T>(this string SerializedJSONString)
{
var stuff = JsonConvert.DeserializeObject<List<T>>(SerializedJSONString);
return stuff;
}
It is used like this:
var rc = new MyHttpClient(URL);
//This response is the JSON Array (see posts above)
var response = rc.SendRequest();
var data = response.Deserialize<MyClassType>();
MyClassType looks like this (must match name value pairs of JSON array)
[JsonObject(MemberSerialization = MemberSerialization.OptIn)]
public class MyClassType
{
[JsonProperty(PropertyName = "Id")]
public string Id { get; set; }
[JsonProperty(PropertyName = "Name")]
public string Name { get; set; }
[JsonProperty(PropertyName = "Description")]
public string Description { get; set; }
[JsonProperty(PropertyName = "Manager")]
public string Manager { get; set; }
[JsonProperty(PropertyName = "LastUpdate")]
public DateTime LastUpdate { get; set; }
}
Use NUGET to download Newtonsoft.Json add a reference where needed...
using Newtonsoft.Json;
Can't add a comment to the solution but that didn't work for me. The solution that worked for me was to use:
var des = (MyClass)Newtonsoft.Json.JsonConvert.DeserializeObject(response, typeof(MyClass));
return des.data.Count.ToString();
Deserializing JSON array into strongly typed .NET object
Use this, FrontData is JSON string:
var objResponse1 = JsonConvert.DeserializeObject<List<DataTransfer>>(FrontData);
and extract list:
var a = objResponse1[0];
var b = a.CustomerData;
To extract the first element (Key) try this method and it will be the same for the others :
using (var httpClient = new HttpClient())
{
using (var response = await httpClient.GetAsync("Your URL"))
{
var apiResponse = await response.Content.ReadAsStringAsync();
var list = JObject.Parse(apiResponse)["Attributes"].Select(el => new { Key= (string)el["Key"] }).ToList();
var Keys= list.Select(p => p.Key).ToList();
}
}
var objResponse1 =
JsonConvert.DeserializeObject<List<RetrieveMultipleResponse>>(JsonStr);
worked!
I'm currently working on a webservice, and I have this behavior that I haven't encountered until today. Here's the class I'm returning:
public class Block
{
public int order { get; set; }
public string title { get; set; }
public Dictionary<string, object> attributes { get; set; }
}
attributes can contain any kind of value: simple type, object, array, etc.
And when I return a Block object through my webservice, here's what I get:
{
"order": 1,
"attributes": [
{
"Key": "key1",
"Value": "value1"
},
{
"Key": "key2",
"Value": "value2"
}
],
"title": "Title"
}
Does anyone know why I'm not simply getting a "key1": "value1" output?
First of all your JSON is not valid, please be aware there are no , after "order": 1 this line.
After this correction you can change your class structure like this
public class Attribute
{
public string Key { get; set; }
public object Value { get; set; }
}
public class Block
{
public int order { get; set; }
public List<Attribute> attributes { get; set; }
public string title { get; set; }
}
this way you will be able to deserialize your JSON, I used simply this website https://json2csharp.com/ for converting your JSON into C# class
As for usage you can do .FirstOrDefault(x=>x.Key=="key1") to get whichever data you want, or if you will process all the list one by one you can simply do attributes.Count
When I do
var x = new Class
{
order = 1,
title = "Title",
attributes = new Dictionary<string, object>
{
{ "key1", "value1" },
{ "key2", "value2" }
}
};
var json = JsonConvert.SerializeObject(x);
Console.WriteLine(json);
I get
{"order":1,"title":"Title","attributes":{"key1":"value1","key2":"value2"}}
Do you have code that serializes your data or does ASP.NET do it for you?
So I am struggeling to parse the following JSON string. Even after researching many questions here on StackOverflow.
Json
[
{
"text": {
"0": "Element 1"
},
"cascade": [],
"val": "1"
},
{
"text": {
"0": "Element 2"
},
"cascade": [],
"val": "2"
},
{
"text": {
"0": "Element 3"
},
"cascade": [],
"val": "3"
},
{
"text": {
"0": "Unknown"
},
"cascade": [],
"val": "0"
}
]
The class I created for this looks like this:
Options.cs
using System.Collections.Generic;
namespace App.Models
{
public class Options
{
public ICollection<IDictionary<string, string>> text { get; set; }
public List<string> cascade { get; set; }
public string val { get; set; }
}
}
For running the deserialization I've written the following line:
List<Options> optionList = JsonConvert.DeserializeObject<List<Options>>(inputString);
I'm getting the following exceptions when I try to run the code:
Newtonsoft.Json.JsonSerializationException: Timeout exceeded getting exception details
You problem is reading the "text" object.
From you sample, it contains key/value pairs of string type both.
There is no reason to use ICollection there, but only Dictionary<string, string>
public class Options
{
public Dictionary<string, string> text { get; set; }
public List<string> cascade { get; set; }
public string val { get; set; }
}
Update:
Since your sample JSON does not include data about the cascade member (only an empty array), it might be safe declaring it as a list of objects List<object>.
"fields": [
{
"field": {
"name": "SMS",
"value": "Yes"
}
},
{
"field": {
"name": "Email",
"value": ""
}
},
{
"field": {
"name": "Total",
"value": ""
}
},
]
I have tried to form the JSON format like above, so i formed the class like below. While serialization it does not return expected form, how can i achieve this one.
public class Test
{
public List<Field> fields;
}
public class Field
{
public string name { get; set; }
public string value { get; set; }
}
Response:
"fields": [{
"name": "SMS",
"value": "Yes"
}, {
"name": "Email",
"value": ""
},{
"name": "Total",
"value": ""
}]
Use this website http://json2csharp.com and generate all the classes automatically. Just copy-paste your json there.
You can customize resulting JSON object with anonymous types and LINQ. Please try this code:
var test = new Test {fields = new List<Field>()};
test.fields.Add(new Field {name = "f1", value = "v1"});
test.fields.Add(new Field {name = "f2", value = "v2"});
var json = JObject.FromObject(new { fields = test.fields.Select(f => new {field = f}).ToArray() })
.ToString();
A json variable would be:
{
"fields": [
{
"field": {
"name": "f1",
"value": "v1"
}
},
{
"field": {
"name": "f2",
"value": "v2"
}
}
]
}
You just missed a class level:
public class Test
{
public List<FieldHolder> fields;
}
public class FieldHolder
{
public Field field { get; set; }
}
public class Field
{
public string name { get; set; }
public string value { get; set; }
}
I have this JSON:
[
{
"Attributes": [
{
"Key": "Name",
"Value": {
"Value": "Acc 1",
"Values": [
"Acc 1"
]
}
},
{
"Key": "Id",
"Value": {
"Value": "1",
"Values": [
"1"
]
}
}
],
"Name": "account",
"Id": "1"
},
{
"Attributes": [
{
"Key": "Name",
"Value": {
"Value": "Acc 2",
"Values": [
"Acc 2"
]
}
},
{
"Key": "Id",
"Value": {
"Value": "2",
"Values": [
"2"
]
}
}
],
"Name": "account",
"Id": "2"
},
{
"Attributes": [
{
"Key": "Name",
"Value": {
"Value": "Acc 3",
"Values": [
"Acc 3"
]
}
},
{
"Key": "Id",
"Value": {
"Value": "3",
"Values": [
"3"
]
}
}
],
"Name": "account",
"Id": "2"
}
]
And I have these classes:
public class RetrieveMultipleResponse
{
public List<Attribute> Attributes { get; set; }
public string Name { get; set; }
public string Id { get; set; }
}
public class Value
{
[JsonProperty("Value")]
public string value { get; set; }
public List<string> Values { get; set; }
}
public class Attribute
{
public string Key { get; set; }
public Value Value { get; set; }
}
I am trying to deserialize the above JSON using the code below:
var objResponse1 = JsonConvert.DeserializeObject<RetrieveMultipleResponse>(JsonStr);
but I am getting this error:
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type
'test.Model.RetrieveMultipleResponse' because the type requires a JSON
object (e.g. {"name":"value"}) to deserialize correctly. To fix this
error either change the JSON to a JSON object (e.g. {"name":"value"})
or change the deserialized type to an array or a type that implements
a collection interface (e.g. ICollection, IList) like List that can
be deserialized from a JSON array. JsonArrayAttribute can also be
added to the type to force it to deserialize from a JSON array. Path
'', line 1, position 1.
Your json string is wrapped within square brackets ([]), hence it is interpreted as array instead of single RetrieveMultipleResponse object. Therefore, you need to deserialize it to type collection of RetrieveMultipleResponse, for example :
var objResponse1 =
JsonConvert.DeserializeObject<List<RetrieveMultipleResponse>>(JsonStr);
If one wants to support Generics (in an extension method) this is the pattern...
public static List<T> Deserialize<T>(this string SerializedJSONString)
{
var stuff = JsonConvert.DeserializeObject<List<T>>(SerializedJSONString);
return stuff;
}
It is used like this:
var rc = new MyHttpClient(URL);
//This response is the JSON Array (see posts above)
var response = rc.SendRequest();
var data = response.Deserialize<MyClassType>();
MyClassType looks like this (must match name value pairs of JSON array)
[JsonObject(MemberSerialization = MemberSerialization.OptIn)]
public class MyClassType
{
[JsonProperty(PropertyName = "Id")]
public string Id { get; set; }
[JsonProperty(PropertyName = "Name")]
public string Name { get; set; }
[JsonProperty(PropertyName = "Description")]
public string Description { get; set; }
[JsonProperty(PropertyName = "Manager")]
public string Manager { get; set; }
[JsonProperty(PropertyName = "LastUpdate")]
public DateTime LastUpdate { get; set; }
}
Use NUGET to download Newtonsoft.Json add a reference where needed...
using Newtonsoft.Json;
Can't add a comment to the solution but that didn't work for me. The solution that worked for me was to use:
var des = (MyClass)Newtonsoft.Json.JsonConvert.DeserializeObject(response, typeof(MyClass));
return des.data.Count.ToString();
Deserializing JSON array into strongly typed .NET object
Use this, FrontData is JSON string:
var objResponse1 = JsonConvert.DeserializeObject<List<DataTransfer>>(FrontData);
and extract list:
var a = objResponse1[0];
var b = a.CustomerData;
To extract the first element (Key) try this method and it will be the same for the others :
using (var httpClient = new HttpClient())
{
using (var response = await httpClient.GetAsync("Your URL"))
{
var apiResponse = await response.Content.ReadAsStringAsync();
var list = JObject.Parse(apiResponse)["Attributes"].Select(el => new { Key= (string)el["Key"] }).ToList();
var Keys= list.Select(p => p.Key).ToList();
}
}
var objResponse1 =
JsonConvert.DeserializeObject<List<RetrieveMultipleResponse>>(JsonStr);
worked!