public async Task Add(Concept concept, CancellationToken cancellationToken = default(CancellationToken))
{
var existing = await _conceptRepository.GetByName(concept.Name, cancellationToken);
if (existing != null)
{
throw new DomainValidationException($"A concept named {concept.Name} already exists.");
}
await _conceptRepository.Create(concept, cancellationToken);
}
protected override async Task HandleTransacted(AddConceptCommand command, CancellationToken cancellationToken = default(CancellationToken))
{
var concept = new Concept(command.ConceptId, command.DomainId, command.Name, command.Description);
await _conceptRepository.Create(concept, cancellationToken);
}