public int NumberOfMoviesWithGrade(int grade)
{
if (grade < 1 || grade > 5)
{
throw new ArgumentException("Grade must be 1 - 5");
}
HashSet <int> movies = new HashSet <int>();
foreach (MovieRating rating in RatingsRepository.GetAllMovieRatings())
{
if (rating.Grade == grade)
{
movies.Add(rating.Movie);
}
}
return(movies.Count);
}
public double GetAverageRateFromReviewer(int reviewer)
{
try
{
return(Repository.GetAllMovieRatings()
.Where <MovieRating>(rating => rating.Reviewer == reviewer)
.Average <MovieRating>(rating => rating.Grade));
}
catch
{
throw new ArgumentException($"Reviewer:{reviewer} has no reviews");
}
}