NET 8 – Deserialize into read-only properties
Starting with .NET 8 you can deserialize into properties which do not have a set accessor. You can opt-in for this behavior using JsonSerializerOptions, or on a per-type basis using the JsonObjectCreationHandling attribute.
Using JsonObjectCreationHandling attribute
You can annotate your type with the System.Text.Json.Serialization.JsonObjectCreationHandling attribute, passing your option as a parameter.
[JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]
public class Foo
{
public int Bar { get; }
}
Code language: C# (cs)Using JsonSerializerOptions
You can set the JsonSerializerOptions.PreferredObjectCreationHandling property to Populate and pass it along to the Deserialize method.
new JsonSerializerOptions
{
PreferredObjectCreationHandling = JsonObjectCreationHandling.Populate
};
Code language: C# (cs)
am I correct that this doesn’t work in .net 9?
public class Foo
{
public Foo(int b) {
this.Bar = b;
}
[JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]
public int Bar { get; }
}