GetSampleByIdHandler.cs

public class GetSampleByIdHandler : IRequestHandler<GetSampleByIdQuery, ServiceResponse>
{
    private readonly IReadOnlyRepository<Sample> repository;

    public GetSampleByIdHandler(IReadOnlyRepository<Sample> repository)
    {
        this.repository = repository;
    }

    public async Task<ServiceDataResponse> Handle(GetSampleByIdQuery request, CancellationToken cancellationToken)
    {
		var sample = await repository.GetSingleAsync(x => x.Id == request.Id);
        return ServiceDataResponse.Ok(sample);
    }
}