public async Task <Unit> Handle(ShowMasterCommand command, CancellationToken cancellationToken) { var playerId = command.PlayerId; var player = await _playerDomainService.Get(playerId); if (player == null) { await _bus.RaiseEvent(new DomainNotification($"角色不存在!")); return(Unit.Value); } var myMasterModel = new MyMasterModel { }; var playerRelation = await _playerRelationDomainService.Get(x => x.Type == PlayerRelationTypeEnum.师父 && x.PlayerId == playerId); if (playerRelation != null) { var master = await _npcDomainService.Get(playerRelation.RelationId); if (master != null) { myMasterModel.Master = _mapper.Map <PlayerBaseInfo>(master); } } await _mudProvider.ShowMaster(playerId, myMasterModel); return(Unit.Value); }