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Questions tagged [system.text.json]

System.Text.Json is the built-in JSON facilities added in .NET Core 3.0.

The System.Text.Json namespace provides high-performance, low-allocating, and standards-compliant capabilities to process JSON, which includes serializing objects to JSON text and deserializing JSON text to objects, with UTF-8 support built-in. It also provides types to read and write JSON text encoded as UTF-8, and to create an in-memory document object model (DOM) for random access of the JSON elements.

Additional details can be found in the how to article.

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Using JsonConverter with Single Object and a List of Object

I am trying to implement a JsonConverter that will work when deserializing a single object as well as when that object is in a list. It works fine when using with a single object but not when the Json contains a array of the objects. Here is the…
Gordon Gudmundson
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Deserializing a data member that could be int or string c#

I've created an API endpoint that is receiving a List of objects. The 'AttributeValue' of the objects could be either a string or an int. Here is a generic version of my code: public class b { public List myList {get; set;} = new…
Nicole Kurtz
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Avoid re-serializing of a json string

Is there a way to selectively exclude a field from re-serialization, if it already contains a valid json string? Here is what I am attempting. First, I define a class of the result row I recieve from my database. public class objectToSerialize { …
roboblocky
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How do I avoid writing `$type` with System.Text.Json?

How do I avoid exposing a type discriminator when serializing a class that has opted into polymorphic deserialization? I'm using System.Text.Json's JsonDerivedType attributes to do polymorphic deserialization. So I need to specify typeDiscriminator…
Jason Weinzierl
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How to correctly Serialize Dictionary using [JsonExtensionData] with JsonNamingPolicy.CamelCase?

I need to use JsonNamingPolicy.CamelCase to serialize my object. But when I use Dictionary with [JsonExtensionData] attribute, it seems something not work correctly. Example Code. public class Test { public Dictionary Labels {…
Changemyminds
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System.Text.Json custom null values

I'm using an api endpoint and they are returning invalid responses in some of the fields instead of null values for decimals. here is an example { "name": "MyName", "decimalOne": "0.01", "decimalTwo": "None", "decimalThree": "-" } I would…
kewur
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How to generate JsonPropertyName dynamically?

I have the below Model class, using System.ComponentModel.DataAnnotations; using System.Text.Json.Serialization; public class FormField { [Required] [JsonPropertyName("STD_USERTYPEID")] public string UserTypeId { get; set; } …
tRuEsAtM
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The JSON value could not be converted to model in .NET Core

I have these model classes: public class TransactionInfo { public int request_id { get; set; } public DateTime request_date { get; set; } public double request_amount { get; set; } public int request_count { get; set;…
Ehsan Akbar
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JsonTextWriter equivalent system.text from stream writer

I have newtonsoft json web api project that try to migrate system.text but I cannot figure out how to convert the code below. public static void SerializeJsonIntoStream(object value, Stream stream) { using (var sw = new…
datnet
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System.Text.Json Custom Deserialization for Dictionary>>

I need to have the System.Text.Json.JsonSerializer be able to deserialize this nested Dictionary type structure, but I'm getting the following error: Unable to cast object of type 'System.Text.Json.JsonElement' to type 'System.String'. I have the…
Charles
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Unable to serialize custom attribute in System.Text.Json

There is a custom attribute I created that I prescribe to classes for the markup extension. I used to use the serialization mechanism through Newtonsoft.Json and I want to switch to Text.Json, but I ran into a problem that it throws exceptions when…
Magals
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How to add property in existing json

I receive a JSON file like this: { "Name": "testeName", "type": "unique", "TestData": [{ "price": 2.3 }] } I want to add a new property ("type":"unique") to each object in TestData to be like this in the end: { "Name":…
Sacamoto
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JSON Deserializer issue in C#

I'm a newbie having my first go at importing data from a json file to a c# application. In this case, I'm making an app to organise and manage recipes for a crafting videogame I'm playing. I have a json file with my recipe info in it; { …
Drumknott88
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System.Text.Json serialize array of type to a json object with properties

Using System.Text.Json, how can I serialize (and deserialize) an array of n elements (classes), to an object of n children, where the element name is one of the properties of the object? For example, by default the following classes public class…
JobaDiniz
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How to hide a property in a C# class from appearing in the JSON response body of a method that returns IActionResult?

I have defined a ProblemDetails class. I construct an object of this class and return from my Http triggered Azure function upon error. I have defined a convenience property HasDetail to tell if the object has any detail meaning if the object is…
blogs4t
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