public OperationResult <bool> SavePaper(IPaperDTO paperDTO)
{
try
{
IPaperDAC paperDAC = DACFactory.Create <IPaperDAC>();
IPaperDTO rnDTO = paperDAC.GetPaperByTitle(paperDTO.Name);
if (paperDTO.PaperId == -1 && rnDTO != null)
{
return(OperationResult <bool> .CreateFailureResult(true, "Name can't be same to another Paper"));
}
else if (paperDTO.PaperId != -1 && rnDTO != null && rnDTO.PaperId != paperDTO.PaperId)
{
return(OperationResult <bool> .CreateFailureResult(true, "Name can't be same to another Paper"));
}
paperDAC.SavePaper(paperDTO);
return(OperationResult <bool> .CreateSuccessResult(true, "Success"));
}
catch (Exception ex)
{
return(OperationResult <bool> .CreateErrorResult(false, ex.Message));
}
}
public OperationResult <IList <IQuestionDTO> > GetQuestionsOfPaper(int paperId)
{
try
{
IPaperDAC paperDAC = DACFactory.Create <IPaperDAC>();
IList <IQuestionDTO> ans = paperDAC.GetQuestionsOfPaper(paperId);
return(OperationResult <IList <IQuestionDTO> > .CreateSuccessResult(ans, "Success"));
}
catch (Exception ex)
{
return(OperationResult <IList <IQuestionDTO> > .CreateErrorResult(null, ex.Message));
}
}
public OperationResult <IPaperDTO> GetPaperById(int paperId)
{
try
{
IPaperDAC paperDAC = DACFactory.Create <IPaperDAC>();
IPaperDTO paperDTO = paperDAC.GetPaperById(paperId);
return(OperationResult <IPaperDTO> .CreateSuccessResult(paperDTO, "Success"));
}
catch (Exception ex)
{
return(OperationResult <IPaperDTO> .CreateErrorResult(null, ex.Message));
}
}
public OperationResult <IList <IPaperDTO> > GetAllPapers()
{
try
{
IPaperDAC paperDAC = DACFactory.Create <IPaperDAC>();
IList <IPaperDTO> papersDTOs = paperDAC.GetAllPapers();
return(OperationResult <IList <IPaperDTO> > .CreateSuccessResult(papersDTOs, "Success"));
}
catch (Exception ex)
{
return(OperationResult <IList <IPaperDTO> > .CreateErrorResult(null, ex.Message));
}
}
public OperationResult <bool> DeletePaper(int paperId)
{
try
{
IPaperDAC paperDAC = DACFactory.Create <IPaperDAC>();
bool ans = paperDAC.DeletePaper(paperId);
if (ans)
{
return(OperationResult <bool> .CreateSuccessResult(true, "Success"));
}
else
{
return(OperationResult <bool> .CreateFailureResult(true, "Can not delete Paper containing questions."));
}
}
catch (Exception ex)
{
return(OperationResult <bool> .CreateErrorResult(false, ex.Message));
}
}