System.MissingMethodException: Method not found: 'Void System.Text.Json.Serialization.Metadata.JsonObjectInfoValues1.set_ObjectCreator(System.Func1<!0>)'. with .NET Standard 2.0 #61737
Description
Description
I have a .NET 6 app that references a .NET Standard 2.0 class library, which in turn uses the new System.Text.Json source generator to speed up serialization.
When running I get the following exception (this stack trace is from a project used to reproduce the error):
System.MissingMethodException
HResult=0x80131513
Message=Method not found: 'Void System.Text.Json.Serialization.Metadata.JsonObjectInfoValues`1.set_ObjectCreator(System.Func`1<!0>)'.
Source=ClassLibrary1
StackTrace:
at ClassLibrary1.SerializerContext.get_MyModel() in D:\PrjNET\_Experiments\SystemTextJsonSerializerContext\ClassLibrary1\System.Text.Json.SourceGeneration\System.Text.Json.SourceGeneration.JsonSourceGenerator\SerializerContext.MyModel.g.cs:line 37
at ClassLibrary1.Serializer.Serialize(MyModel model) in D:\PrjNET\_Experiments\SystemTextJsonSerializerContext\ClassLibrary1\Serializer.cs:line 9
at Program.<Main>$(String[] args) in D:\PrjNET\_Experiments\SystemTextJsonSerializerContext\ConsoleApp1\Program.cs:line 5
This DOES NOT happen if the class library targets .NET 6.
Reproduction Steps
I've created a sample to reproduce this so I could eliminate the possibility of something being wrong with the original projects (upgraded from .NET 5).
The class library (netstandard2.0) code:
namespace ClassLibrary1
{
public class MyModel
{
public string Value
{
get; set;
}
}
public partial class Serializer
{
public static string Serialize(MyModel model)
{
return JsonSerializer.Serialize(
model,
SerializerContext.Default.MyModel);
}
public static string SerializeWithGenerics<T>(T model)
{
return JsonSerializer.Serialize(
model,
typeof(T),
SerializerContext.Default);
}
}
[JsonSerializable(typeof(MyModel))]
internal partial class SerializerContext : JsonSerializerContext
{
}
}
The console app (net6.0) code:
using ClassLibrary1;
MyModel model1 = new MyModel();
string json1 = Serializer.Serialize(model1);
string json2 = Serializer.SerializeWithGenerics(model1);
Console.WriteLine(json1);
Console.WriteLine(json2);
Console.ReadKey();
Expected behavior
This should work exactly the same in .NET 6 and .NET Standard 2.0, given that the System.Text.Json is multi-targeting.
Actual behavior
It fails in .NET Standard 2.0 with the exception above.
Regression?
No response
Known Workarounds
No response
Configuration
.NET 6.0.100
Visual Studio 2022 17.0.1
Windows 10 20H2
Other information
No response