System.Text.JSON doesn't deserialize what Newtonsoft does

Question

I have a json that the new System.Text.Json.JsonSerializer.Deserialize<T>(json_data) serialize as List<T> with the correct numbers of elements, but then the objects inside have all the values null or 0

Same json with Newtonsoft.Json.JsonConvert.DeserializeObject<T>(json_data) is correctly filled.

Class:

public class SensorValue
    {
        public string StationCode { get; set; }
        public string SensorCode { get; set; }
        public string SensorNameIt { get; set; }
        public string SensorNameDe { get; set; }
        public string SensorNameLd { get; set; }
        public string SensorUnitMeasure { get; set; }
        public DateTime SamplingDateTime { get; set; }
        public Decimal SamplingValue { get; set; }
    }

JSON

[{"stationCode":"89190MS","sensorCode":"LT","sensorNameIt":"Temperatura dell´aria","sensorNameDe":"Lufttemperatur","sensorNameLd":"Temperatura dl’aria","sensorUnitMeasure":"°C","samplingDateTime":"2019-11-15T15:10:00","samplingValue":0.3},{"stationCode":"89190MS","sensorCode":"N","sensorNameIt":"Precipitazioni","sensorNameDe":"Niederschlag","sensorNameLd":"plueia","sensorUnitMeasure":"mm","samplingDateTime":"2019-11-15T15:10:00","samplingValue":0.4},{"stationCode":"89190MS","sensorCode":"WR","sensorNameIt":"Direzione del vento","sensorNameDe":"Windrichtung","sensorNameLd":"Direzion dl vënt","sensorUnitMeasure":"° ","samplingDateTime":"2019-11-15T15:10:00","samplingValue":165.7},{"stationCode":"89190MS","sensorCode":"WG","sensorNameIt":"Velocità del vento","sensorNameDe":"Windgeschwindigkeit","sensorNameLd":"Slune dl vënt","sensorUnitMeasure":"m/s","samplingDateTime":"2019-11-15T15:10:00","samplingValue":0.7},{"stationCode":"89190MS","sensorCode":"WG.BOE","sensorNameIt":"Velocitá raffica","sensorNameDe":"Windgeschwindigkeit Böe","sensorNameLd":"Slune dl vënt","sensorUnitMeasure":"m/s","samplingDateTime":"2019-11-15T15:10:00","samplingValue":1.3},{"stationCode":"89190MS","sensorCode":"LF","sensorNameIt":"Umidità relativa","sensorNameDe":"relative Luftfeuchte","sensorNameLd":"Tume relatif","sensorUnitMeasure":"%","samplingDateTime":"2019-11-15T15:10:00","samplingValue":100.0},{"stationCode":"89190MS","sensorCode":"LD.RED","sensorNameIt":"Pressione atmosferica","sensorNameDe":"Luftdruck","sensorNameLd":"Druch dl’aria","sensorUnitMeasure":"hPa","samplingDateTime":"2019-11-15T15:10:00","samplingValue":1006.9},{"stationCode":"89190MS","sensorCode":"GS","sensorNameIt":"Radiazione globale ","sensorNameDe":"Globalstrahlung","sensorNameLd":"Nraiazion globala ","sensorUnitMeasure":"W/m²","samplingDateTime":"2019-11-15T15:10:00","samplingValue":3.8},{"stationCode":"89190MS","sensorCode":"SD","sensorNameIt":"Durata soleggiamento","sensorNameDe":"Sonnenscheindauer","sensorNameLd":"Dureda dl surëdl","sensorUnitMeasure":"s","samplingDateTime":"2019-11-15T15:10:00","samplingValue":0.0}]

Any help ? consoleapp project .net core 3.0.0 newtonsoft 12.0.3

Phill · Accepted Answer · 2020-06-10 04:54:31Z

94

The default behavior of the System.Text.Json deserializer is to match properties as case sensitive. You need to pass options telling it to match case insensitive:

using System.Text.Json;

JsonSerializer.Deserialize<T>(json_data, new JsonSerializerOptions 
{
    PropertyNameCaseInsensitive = true
});

edited Jun 10, 2020 at 4:54

Phill

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answered Nov 15, 2019 at 14:45

Klaycon

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2 Comments

Seva Over a year ago

Just a heads up about passing a new copy of serializer options every time: performance can suffer: github.com/dotnet/runtime/issues/38982

Saurabh Solanki Jan 13 at 11:59

We can introduce class level property for JsonSerializerOptions option which can be used in serialization and deserialization as well

Ali Karaca · Accepted Answer · 2023-02-17 08:38:10Z

12

For setting globally, in Program.cs / Startup.cs set

services.AddControllers(options =>
{
    //...
}).AddJsonOptions(options =>
{
    options.JsonSerializerOptions.PropertyNameCaseInsensitive = true;
    options.JsonSerializerOptions.Encoder = JavaScriptEncoder.Default;
});

edited Feb 17, 2023 at 8:38

answered Feb 2, 2021 at 23:32

Ali Karaca

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1 Comment

Kishan Vaishnav Over a year ago

This answer did not work for me as I was using it in my .net core api. I had to pass the options in the Deserialize method itseelf.

PhiseySt · Accepted Answer · 2022-02-11 13:57:02Z

5

I had a problem getting default values instead of real ones. When I forgot to add an identifier to the properties of the model in the current project (set). Prior to using serialization/deserialization, only the identifier (get) was required for properties in the model. But for me both libraries (System.Text.Json and NewtonSoft )returned the default value. This is not the case of the topic starter.

answered Feb 11, 2022 at 13:57

PhiseySt

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2 Comments

Pinka Over a year ago

Thanks! I spent too much time figuring out why all my properties are "null" even when using "PropertyNameCaseInsensitive = true". Turned out it was because the class properties did not have "set".

James Poulose Over a year ago

You have no idea how much time I wasted on this!

Felipe Augusto · Accepted Answer · 2021-01-25 01:16:45Z

1

if (response.IsSuccessStatusCode)
{
   var json = await response.Content.ReadAsStringAsync();

   var options = new JsonSerializerOptions
   {
       WriteIndented = true,
       PropertyNameCaseInsensitive = true // this is the point
   };

   var books = JsonSerializer.Deserialize<IEnumerable<Book>>(json, options);
}

answered Jan 25, 2021 at 1:16

Felipe Augusto

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Comments

John · Accepted Answer · 2021-06-20 08:32:27Z

1

You can also apply JsonPropertyName attributes to the model properties.

[JsonPropertyName("yourSourceJsonKey")]
public string YourPropertyName { get; set; }

https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-customize-properties#customize-individual-property-names

This article describes the behaviour of the serialiser:

https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-how-to?pivots=dotnet-core-3-1#serialization-behavior

answered Jun 20, 2021 at 8:32

John

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