In Json.Net we have JsonConstructor attribute in order to instruct deserializer that should use the constructor to create the object.
Is there alternative in System.Text.Json?
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2Not currently implemented, see System.Text.Json: Custom Constructor Support #40399 For the 3.0 release, there is no planned additional support for calling a non-default constructor during deserialization. That would have to be done by a custom converter.dbc– dbc2019-10-18 15:29:15 +00:00Commented Oct 18, 2019 at 15:29
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Should I make that an answer?dbc– dbc2019-10-18 22:26:58 +00:00Commented Oct 18, 2019 at 22:26
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2 Answers
Looks like this has now been added as of .NET 5.0 Preview 8:
JsonSerializer improvements in .NET 5
Related issue: JsonSerializer support for immutable classes and structs
Related pull request: Add [JsonConstructor] and support for deserializing with parameterized ctors
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Please try this library I wrote as an extension to System.Text.Json to offer polymorphism: https://github.com/dahomey-technologies/Dahomey.Json
Add [JsonConstructor] attribute defined in the namespace Dahomey.Json.Attributes on your class.
public class ObjectWithConstructor
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
[JsonConstructor]
public ObjectWithConstructor(int id, string name)
{
Id = id;
Name = name;
}
}
Setup json extensions by calling on JsonSerializerOptions the extension method SetupExtensions defined in the namespace Dahomey.Json. Then deserialize your class with the regular Sytem.Text.Json API.
JsonSerializerOptions options = new JsonSerializerOptions();
options.SetupExtensions();
const string json = @"{""Id"":12,""Name"":""foo"",""Age"":13}";
ObjectWithConstructor obj = JsonSerializer.Deserialize<ObjectWithConstructor>(json, options);
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