I am attempting to deserialize a piece of JSON with a specific structure like so:
{
"label1": "value1",
"label2": [
[
[
"concept_id_1",
"concept_1"
],
score_1
],
[
[
"concept_id_2",
"concept_2"
],
score_2
],
……
],
"label3": "value3",
"label4": "value4"
}
For what it's worth, the scores are floats and everything else is a string. The number of returned concepts under "label2" is variable.
I'm attempting to deserialize it using JSON.net. The only content I actually care about is the inside nest of arrays labelled "label2", however the lack of labels inside the arrays is blocking me at every turn.
I've tried a variety of approaches, but the most successful so far seems to be this:
public class Parsed_JSON {
public string label1 { get; set; }
public ICollection<Full_Result> label2 { get; set; }
public string label3 { get; set; }
public string label4 { get; set; }
}
public class Full_Result {
public IList<string> values { get; set; }
public float score { get; set; }
}
Parsed_JSON result = JsonConvert.DeserializeObject<Parsed_JSON>(JSON);
However this is failing with the error:
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'JSON_Parsing+Full_Result' 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.
Ultimately I'll be looking to iterate through the contents of label2 so that I can build a DataTable of them like so:
concept_id_1 concept_1 score_1
concept_id_2 concept_2 score_2
How can I deserialize this JSON?
You can use the custom JsonConverter ObjectToArrayConverter<Full_Result> from this answer to C# JSON.NET - Deserialize response that uses an unusual data structure to deserialize your JSON into your existing typed data model. Modify Full_Result as follows:
[JsonConverter(typeof(ObjectToArrayConverter<Full_Result>))]
public class Full_Result
{
[JsonProperty(Order = 1)]
public IList<string> values { get; set; }
[JsonProperty(Order = 2)]
public float score { get; set; }
}
And you will now be able to deserialize as follows:
Parsed_JSON result = JsonConvert.DeserializeObject<Parsed_JSON>(JSON);
Notes:
ObjectToArrayConverter<T> works by mapping the serializable members of T to an array, where the array sequence is defined by the value of the JsonPropertyAttribute.Order attribute applied to each member. Data contract attributes with DataMemberAttribute.Order set could be used instead, if you prefer.
In your JSON the "score" values are not actually numbers:
score_1
score_2
I am assuming that this is a typo in the question and that these values are in fact well-formed numbers as defined by the JSON standard.
Sample fiddle here.
Related
I have the following Json:
{
"Id":"2727",
"Region":"US",
"Data":[
{
"Title":"Director",
"JobDescription":"Coordinates the department activity",
"Department":"HR"
},
{
"Title":"Programmer",
"JobDescription":"Enterprise software developer",
"Department":"FR"
}
]
}
My format looks like this:
public class Data
{
public string Title { get; set; }
public string JobDescription { get; set; }
public string Department { get; set; }
}
public class Format
{
public string Id { get; set; }
public string Region { get; set; }
public List<Data> Data {get; set;}
}
I have tried to deserialize it like this:
var objects = JsonConvert.DeserializeObject<IEnumerable<Format>>(File.ReadAllText("mockJson.json")).ToList();
I am getting this exception:
An unhandled exception of type
'Newtonsoft.Json.JsonSerializationException' occurred in
Newtonsoft.Json.dll Cannot deserialize the current JSON object (e.g.
{"name":"value"}) into type
'System.Collections.Generic.IEnumerable`1[JSONParsingExample.Format]'
because the type requires a JSON array (e.g. [1,2,3]) to deserialize
correctly. To fix this error either change the JSON to a JSON array
(e.g. [1,2,3]) or change the deserialized type so that it is a normal
.NET type (e.g. not a primitive type like integer, not a collection
type like an array or List) that can be deserialized from a JSON
object. JsonObjectAttribute can also be added to the type to force it
to deserialize from a JSON object. Path 'GlobalOrgId', line 2,
position 15.
Just posting this as an answer because I think its worth making it more visible. I assumed the method call was going to have some issues with nesting lists inside a json, but I'm pleased to see it works.
Format format = JsonConvert.DeserializeObject<Format>(File.ReadAllText("mockJson.json"));
I inspected the elements and they all seem to be where they are supposed to be.
Just be careful because JsonConvert.DeserializeObject<T> returns an object of type T, not IEnumerable<T>.
When working with JSON in .NET I'd recommend moving over to the new built in stuff.
https://devblogs.microsoft.com/dotnet/net-core-image-processing/
I have some Json content that contains an array, where each item contains an array of objects. I'm searching for a way to convert this into a list of objects. It is only the object with id and biCode is what I'm after, their parent is of no importance for me
I tried the https://json2csharp.com/ website, but according to the output I need to create a Class for each parent object ("UselessText1", "UselessText2", etc) and they just contain id and biCode. I tried to use it, but (as I would have guessed) it didn't work
It threw this Exception: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Root]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
This is the json:
{
"UselessText1": [],
"UselessText2": [
{
"id": 2,
"biCode": "Something useful"
}
],
"UselessText3": [
{
"id": 3,
"biCode": "Something useful"
},
{
"id": 4,
"biCode": "Something useful"
}
]}
Any idea how to deserialize this? Any Google result I found didn't show a situation like mine. I probably didn't know exactly what to search for
try this
var json=...your json string
var deseializedJson = JsonConvert.DeserializeObject< Dictionary<string,UselessText[]>>(json);
var output = JsonConvert.SerializeObject(deseializedJson);
public class UselessText
{
public int id { get; set; }
public string biCode { get; set; }
}
output
{"UselessText1":[],
"UselessText2":[{"id":2,"biCode":"Something useful"}],
"UselessText3":[{"id":3,"biCode":"Something useful"},{"id":4,"biCode":"Something useful"}]}
Your Json example is a little bit weird. It looks like you have an object that contains multiple properties of the same type.
Something that should work for this exact Json would be:
public class MyModel{
public IEnumerable<MyEntity> UselessText1;
public IEnumerable<MyEntity> UselessText2;
public IEnumerable<MyEntity> UselessText3;
}
public class MyEntity{
public int Id;
public string BiCode;
}
This question already has answers here:
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type
(5 answers)
Cannot deserialize the JSON array (e.g. [1,2,3]) into type ' ' because type requires JSON object (e.g. {"name":"value"}) to deserialize correctly
(6 answers)
Closed 2 years ago.
Im doing a Microsoft Cognitive Services project with langauge detection and text translation.
Im receiving Json from the Microsoft Api, and i want to access it as an object.
I've tried a few different things, including JsonConvert.DeserializeObject, and mapping it to my own objects. (Example below)
// Send the request and get response.
HttpResponseMessage response = await client.SendAsync(request).ConfigureAwait(false);
// Read response as a string.
if (response.ReasonPhrase == "OK")
{
//string result = await response.Content.ReadAsStringAsync();
Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(result);
}
// The response:
[{
"detectedLanguage":
{
"language":"fi",
"score":1.0
},
"translations":
[
{"text":"This is a test, I hope it works. The text is in Finnish.","to":"en"},
{"text":"Dette er en test, jeg håber det virker. Teksten er på finsk.","to":"da"}
]
}]
// I found an online tool to generate the appropriate classes for mapping
public class DetectedLanguage
{
[JsonPropertyName("language")]
public string Language { get; set; }
[JsonPropertyName("score")]
public double Score { get; set; }
}
public class Translation
{
[JsonPropertyName("text")]
public string Text { get; set; }
[JsonPropertyName("to")]
public string To { get; set; }
}
public class MyArray
{
[JsonPropertyName("detectedLanguage")]
public DetectedLanguage DetectedLanguage { get; set; }
[JsonPropertyName("translations")]
public List<Translation> Translations { get; set; }
}
public class Root
{
[JsonPropertyName("MyArray")]
public List<MyArray> MyArray { get; set; }
}
// The Error im getting
Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'textananlytics_test.Root' 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<T> 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.'
You can change
Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(result);
to
List<MyArray> list = JsonConvert.DeserializeObject<List<MyArray>>(result);
Root myDeserializedClass=new Root{MyArray=list};
In your case, JSON must has next structure:
{
"MyArray": [
{ /* MyArray jobject */ },
{ /* MyArray jobject */ },
...
]
}
So Yiyi You wrote correct processing
I'm using JSON.net in C# for an Excel VSTO Add in and pulling in JSON via web service.
I have verified the JSON I pull is valid (online JSON Validator) but am unable to convert the JSON into Objects in C# to use.
When I run the code below I get the exception below.
Any ideas on who I can covert the JSON correctly?
Exception:
Newtonsoft.Json.JsonSerializationException:
Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'Bliss.Ribbon1+RootObject[]'
because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type
(e.g. not a primitive type like integer, not a collection type like an array or List<T>)
that can be deserialized from a JSON object.
JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Code:
public async Task<string> getline()
{
<--- Set Client, Execute Request --->
//JSON content shown below
string content = await response.Content.ReadAsStringAsync();
RootObject[] dims = JsonConvert.DeserializeObject<RootObject[]>(content);
return content;
}
public class RootObject
{
public List<string> ledger { get; set; }
public List<string> ledgerAlias { get; set; }
public List<string> entity { get; set; }
public List<string> entityAlias { get; set; }
public List<string> scenario { get; set; }
public List<string> period { get; set; }
public List<string> location { get; set; }
public List<string> measures { get; set; }
}
JSON:
{
"acc":["A","B"],
"accAlias":["ACE","BCE"],
"company":["PEP", "KO"],
"companyAlias":["Pepsi", "Coco-Cola"],
"scenario":["Sales", "Expenses"],
"year": ["2016","2017"],
"areaCode":["123","131","412"],
"clients":["32340-0120","3031-0211","3412-0142"]
}
The JSON represents a single instance of the object, not an array. So instead of this:
RootObject[] dims = JsonConvert.DeserializeObject<RootObject[]>(content)
use this:
RootObject dims = JsonConvert.DeserializeObject<RootObject>(content)
Conversely, if it should be an array, make the JSON itself an array (containing a single element) by surrounding it with brackets:
[{
"acc":["A","B"],
"accAlias":["ACE","BCE"],
"company":["PEP", "KO"],
"companyAlias":["Pepsi", "Coco-Cola"],
"scenario":["Sales", "Expenses"],
"year": ["2016","2017"],
"areaCode":["123","131","412"],
"clients":["32340-0120","3031-0211","3412-0142"]
}]
Edit: As others have also been pointing out, the properties on the JSON object don't actually match that class definition. So while it may "successfully" deserialize, in doing so it's going to ignore the JSON properties it doesn't care about and initialize to default values the class properties.
Perhaps you meant to use a different class? Or different JSON? Or rename one or more properties in one or the other?
Either way, the difference between a single instance and an array of instances is the immediate problem. But in correcting that problem you're going to move on to this next one.
The RootObject and the json are not compatible. You could deserialize using a dictionary. Try this:
var dims = JsonConvert.DeserializeObject<Dictionary<string, string[]>>(content);
I am dealing with JSON for the first time and getting data from OpenTSDB. I've created a c# class to deserialize the JSON to but I am getting the error 'Cannot deserialize the current JSON array' as described below.
My c# code to get JSON:
var request = WebRequest.Create("http://localhost:4242/api/query?start=2013/08/21-12:00:00&end=2013/08/22-12:00:00&m=sum:tcollector.collector.lines_sent&o=&yrange=%5B0:%5D&wxh=924x773");
request.ContentType = "application/json; charset=utf-8";
string text;
try
{
var response = (HttpWebResponse) request.GetResponse();
using (var sr = new StreamReader(response.GetResponseStream()))
{
text = sr.ReadToEnd();
}
uxResponse.Text = text;
OpenTSDBResponse myObject = (OpenTSDBResponse)Newtonsoft.Json.JsonConvert.DeserializeObject(text, typeof(OpenTSDBResponse));
var variable = Newtonsoft.Json.JsonConvert.DeserializeObject(text);
//var tester = myObject;
}
catch (Exception ex)
{
uxResponse.Text = GetFullExceptionMessage(ex);
}
The JSON I am receiving from the above code (i.e. the 'text' variable):
[{
"metric":"tcollector.collector.lines_sent",
"tags":
{
"host":"ubuntu1"
},
"aggregateTags":["collector"],
"dps":
{
"1377050434":1271779.0,
"1377050494":1272073.0,
"1377050554":1272502.0,
"1377050614":1273632.0,
"1377050674":1273867.0
}
}]
My c# classes
internal class OpenTSDBResponse
{
[JsonProperty("metric")]
public string Metric { get; set; }
[JsonProperty("tags")]
public Tags Tags { get; set; }
[JsonProperty("aggregateTags")]
public string[] AggregateTags { get; set; }
[JsonProperty("dps")]
public List<TimeValue> TimeValues { get; set; }
}
internal class Tags
{
[JsonProperty("host")]
public string Host { get; set; }
}
internal class TimeValue
{
[JsonProperty("Time")]
public double Time { get; set; }
[JsonProperty("Value")]
public double Value { get; set; }
}
The error when deserializing object:
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type
'MyNamespace.OpenTSDBResponse' 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.
Additional Information
I used the codeproject deserialize JSON project to create my basic classes, but it created a new c# property for each '"1377050434":1271779.0,' so I updated to use my TimeValue class. http://www.codeproject.com/Tips/79435/Deserialize-JSON-with-C
Question:
How do I get this into an appropriate c# class structure?
Additional Information in response to users comments below:
bjaminn's comment:
I believe the JSON you are receiving is an array. The exception is trying to say you are converting an object[] to OpenTSDBResponse when you really want OpenTSDBResponse[]. Another way to debug this would be to look at the variable variable and see what type it is in the debugger. Of course the line that throws the exception would need to be commented out.
Outcome: I modified the deserialize like this
OpenTSDBResponse[] myObject = (OpenTSDBResponse[])Newtonsoft.Json.JsonConvert.DeserializeObject(text, typeof(OpenTSDBResponse[]));
but received the following error when I ran it:
Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[MyNamespace.OpenTSDBResponseJsonTypes.TimeValue]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.Path '[0].dps.1377050434', line 1, position 121.
Additional Notes on working solution for other new to JSON
I have added another property to my class for the Dictionary as it's really "unix-time-stamp-data","Value". This allows me to work in c# with datetime/values. There may be a better way for casting but this works an doesn't cause any noticeable performance issues for my scenario.
[JsonProperty("dps")]
public Dictionary<string, double> TimeValues { get; set; }
public List<TimeValue> DataPoints
{
get
{
List<TimeValue> times = new List<TimeValue>();
DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);
foreach (var item in TimeValues)
{
times.Add(new TimeValue
{
Time = dtDateTime.AddSeconds(double.Parse(item.Key)).ToLocalTime(),
Value = item.Value
});
}
return times;
}
}
I believe the JSON you are receiving is an array. The exception is trying to say you are converting an object[] to OpenTSDBResponse when you really want OpenTSDBResponse[].
Another way to debug this would be to look at the variable variable and see what type it is in the debugger. Of course the line that throws the exception would need to be commented out.
Tackling new error
It looks like DPS is not a proper JSON array. You could parse it to a dictionary since it looks like the keys will be different in each JSON call.
JSON convert dictionary to a list of key value pairs
New class:
internal class OpenTSDBResponse
{
[JsonProperty("metric")]
public string Metric { get; set; }
[JsonProperty("tags")]
public Tags Tags { get; set; }
[JsonProperty("aggregateTags")]
public string[] AggregateTags { get; set; }
[JsonProperty("dps")]
public Dictionary<string,double> TimeValues { get; set; }
}
You can such so modify your Json Data and your C# Code,for example
[{
"metric":"tcollector.collector.lines_sent",
"tags":
{
"host":"ubuntu1"
},
"aggregateTags":["collector"],
"dps":
[
{"Time":"1377050434","Value":1271779.0},
{"Time":"1377050554","Value":1272502.0}
]
}]
c# Code:
You provide the data is an Array,so when you deserialize the string,you must such so use generic format of deserializeobject
object obj=Newtonsoft.Json.JsonConvert.DeserializeObject<List<OpenTSDBResponse>>(json.ToString());