Found a right way how to correctly read the nested JSON object inside the JsonConverter. The complete solution is the following: public class SomeModel { public int Id { get; set; } public string Name { get; set; } [JsonConverter(typeof(InfoToStringConverter))] public string Info { get; set; } } public class InfoToStringConverter : JsonConverter<string> { public … Read more
As inspired by this answer by Brian Rogers and other answers to How to handle both a single item and an array for the same property using JSON.net, you can create a generic JsonConverter<List<T>> that checks whether the incoming JSON value is an array, and if not, deserializes an item of type T and returns … Read more
Update 2019-10-13: Rewritten the Utf8JsonStreamReader to use ReadOnlySequences internally, added wrapper for JsonSerializer.Deserialize method. I have created a wrapper around Utf8JsonReader for exactly this purpose: public ref struct Utf8JsonStreamReader { private readonly Stream _stream; private readonly int _bufferSize; private SequenceSegment? _firstSegment; private int _firstSegmentStartIndex; private SequenceSegment? _lastSegment; private int _lastSegmentEndIndex; private Utf8JsonReader _jsonReader; private bool … Read more
I ended up solving my issue in slightly the same way I had seen a previous article using a discriminator. Since I do not control the API feeds, I do not have a discriminator to drive off of, so I am relying on the properties of the Json object. Need to create a Converter: public … Read more
In order to deserialize free-form JSON into .Net primitive types instead of JsonElement objects, you will need to write a custom JsonConverter, as no such functionality is provided by System.Text.Json out of the box. One such converter is the following: public class ObjectAsPrimitiveConverter : JsonConverter<object> { FloatFormat FloatFormat { get; init; } UnknownNumberFormat UnknownNumberFormat { … Read more
As of Nov 2021, .NET 6 introduces the System.Text.Json.Nodes namespace which: Provides types for handling an in-memory writeable document object model (DOM) for random access of the JSON elements within a structured view of the data The four new types are JsonArray, JsonObject, JsonNode and JsonValue. The closest type to JObject is JsonObject which offers … Read more
So assuming that Core 3 doesn’t support this out of the box, let’s try to work around this thing. So, what’s our problem? We want a method that overwrites some properties of an existing object with the ones from a json string. So our method will have a signature of: void PopulateObject<T>(T target, string jsonSource) … Read more
Your problem is that you would like to retrieve, filter, and pass along some JSON without needing to define a complete data model for that JSON. With Json.NET, you could use LINQ to JSON for this purpose. Your question is, can this currently be solved as easily with System.Text.Json? As of .NET 6, this cannot … Read more
As explained in the docs, converters are chosen with the following precedence: [JsonConverter] applied to a property. A converter added to the Converters collection. [JsonConverter] applied to a custom value type or POCO. Each case needs to be dealt with separately. If you have [JsonConverter] applied to a property., then simply calling JsonSerializer.Serialize(writer, person, options); … Read more
AddJsonOptions() would config System.Text.Json only for MVC. If you want to use JsonSerializer in your own code you should pass the config to it. var options = new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase, }; var json = “{\”firstname\”:\”John\”,\”lastname\”:\”Smith\”}”; var person = JsonSerializer.Parse<Person>(json, options);