Question

I have two tables in my MS Sql database, Course and StudyCase, with a FK ID (Course table) to Course_ID (in the StudyCase table). I am trying to find the StudyCase ID from the Course id.

In the Repository:

  public IQueryable<StudyCase> ListStudyCases(long courseId)
        {
            return _dbContext.StudyCases.Where(c => c.Course_ID == courseId);
        }

In the StudyCases Services:

public IQueryable<StudyCase> ListStudyCases(long courseId)
    {
        return this._StudyCaseRepository.ListStudyCases(courseId);
    }

In the StudyCases IServices:

 IQueryable<StudyCase> ListStudyCases(long courseId);

Sending the action from the course controller:

 return RedirectToAction("Index", "CourseCases", new { courseId = 6 });

In the StudyCase Controller:

    public ActionResult Index(long courseId)
        {
            string id = "";
            id = _studyCaseSvc.ListStudyCases(courseId).First().ID.ToString();
            StudyCase cases = _studyCaseSvc.GetStudyCase(id);
...

I get the following two error:

Cannot implicitly convert type 'string' to 'long'

and

The best overloaded method match for 'IStudyCaseService.GetStudyCase(long)' has some invalid arguments

Would appreciate your help.

Answer 1

Just use your action argument without converting it to string.

public ActionResult Index(long courseId)
    {
        var id = _studyCaseSvc.ListStudyCases(courseId).First().ID;
        StudyCase cases = _studyCaseSvc.GetStudyCase(id);