Contract model example is incorrect - Field DerivedTypes cannot be set #45871
Description
Type of issue
Code doesn't work
Description
The example in the "Configure polymorphism with the contract model" section is incorrect.
It suggest that you need to set the "DerivedTypes" property initialization - but property JsonPolymorphismOptions.DerivedTypes is get only.
Instead of:
jsonTypeInfo.PolymorphismOptions = new JsonPolymorphismOptions
{
TypeDiscriminatorPropertyName = "$point-type",
IgnoreUnrecognizedTypeDiscriminators = true,
UnknownDerivedTypeHandling = JsonUnknownDerivedTypeHandling.FailSerialization,
DerivedTypes =
{
new JsonDerivedType(typeof(ThreeDimensionalPoint), "3d"),
new JsonDerivedType(typeof(FourDimensionalPoint), "4d")
}
};
It should be:
jsonTypeInfo.PolymorphismOptions = new JsonPolymorphismOptions
{
TypeDiscriminatorPropertyName = "$point-type",
IgnoreUnrecognizedTypeDiscriminators = true,
UnknownDerivedTypeHandling = JsonUnknownDerivedTypeHandling.FailSerialization
};
jsonTypeInfo.PolymorphismOptions.DerivedTypes.Add(new JsonDerivedType(typeof(ThreeDimensionalPoint), "3d"));
jsonTypeInfo.PolymorphismOptions.DerivedTypes.Add(new JsonDerivedType(typeof(FourDimensionalPoint), "4d"));
Page URL
https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/polymorphism
Content source URL
Document Version Independent Id
17511810-6572-ad88-6eaf-4f9bded720b7
Platform Id
c3675880-a4e2-ce92-63f1-ddab72bb3c4c
Article author
Metadata
- ID: 179cc49a-a37d-155e-5ecf-deca4f219a5a
- PlatformId: c3675880-a4e2-ce92-63f1-ddab72bb3c4c
- Service: dotnet-fundamentals