services.AddScoped(typeof(IAsyncRepository<>), typeof(AsyncRepository<>));

public interface IAsyncEvent<in TEvent> where TEvent : class
{
 Task HandleAsync(TEvent eventArg, CancellationToken ct);
}
public class CreateAction<TModel>(TModel model) : ICloneable where TModel : class
{
 public TModel Model
 {
 get;
 } = model;
}
public class CreateEventAsync<TModel>(IAsyncRepository<TModel> repository) : IAsyncEvent<CreateAction<TModel>> where TModel : class
{
 public async Task HandleAsync(CreateAction<TModel> eventArg, CancellationToken ct)
 {
 await repository.CreateAsync(eventArg.Model, userContext, ct);
 }
}

 services.AddScoped(
 typeof(IAsyncEvent<>).MakeGenericType(typeof(CreateAction<>)),
 typeof(CreateEventAsync<>)
 );

 services.AddScoped(
 typeof(IAsyncEvent<CreateAction<>>)),
 typeof(CreateEventAsync<>)
 );