JsonDerivedType Get typed variable

[tisonv]

Hello !

Considering the following simplified code:

[JsonDerivedType(typeof(TryMoveToManagerCommand), typeDiscriminator: nameof(TryMoveToManagerCommand))]
[JsonDerivedType(typeof(TryMoveToConfigurerCommand ), typeDiscriminator: nameof(TryMoveToConfigurerCommand ))]
internal abstract record DariCommand : BaseCommand, ICommand
{
 ....
}
internal sealed record TryMoveToManagerCommand() {}
internal sealed record TryMoveToConfigurerCommand () {}


DariCommand? resourceCommand = JsonSerializer.Deserialize<DariCommand>(message);

switch (resourceCommand)
{
  case TryMoveToManagerCommand tryMoveToManagerCommand:
    await cq.Send(tryMoveToManagerCommand);
    return;
  case TryMoveToConfigurerCommand tryMoveToConfigurerCommand:
    await cq.Send(tryMoveToConfigurerCommand);
    return;
}

Is there a way to get a TryMoveToManagerCommand or TryMoveToConfigurerCommand without the need for a switch ?
There are 50+ commands and growing to handle and I would like to avoid maintaining the switch if possible.

[svick]

What's preventing you from doing await cq.Send(resourceCommand);? What is the signature of the Send method?

[tisonv]

public async Task Send<TCommand>(TCommand command, CancellationToken cancellationToken = default) where TCommand : ICommand
{
  var handler = provider.GetRequiredService<ICommandHandler<TCommand>>()
                      ?? throw new InvalidOperationException($"No handler for {typeof(TCommand).Name}");

  await handler.Handle(command, cancellationToken);
}

If I await cq.Send(resourceCommand);, GetRequiredService will try to resolve ICommandHandler<TCommand> as an ICommand and fails with No service for type 'xxx.yyy.ICommandHandler`1[xxx.yyy.ICommand]' has been registered."

If I cast to the correct type, I don't have the problem.

This fails only with deserialized entities.