public class MovieRepository: IMovieRepository
{
    private readonly MovieDbContext _moviesDbContext;
    public MovieRepository(MovieDbContext moviesDbContext)
    {
        _moviesDbContext = moviesDbContext;
    }

    public IEnumerable<Movie> GetAll()
    {
        return _moviesDbContext.Movies;
    }

    public IEnumerable<Movie> Search(MovieFilters filters)
    {
        var title = filters.Title.ToLower();
        var genre = filters.Genre.ToLower();
        return _moviesDbContext.Movies.Where(
             p => (p.Title.Trim().ToLower().Contains(title) | string.IsNullOrWhiteSpace(p.Title))
             & (p.Genre.Trim().ToLower().Contains(genre) | string.IsNullOrWhiteSpace(p.Genre))
             & (p.YearOfRelease == filters.YearOfRelease | filters.YearOfRelease == null)
           );
    }
}

public IEnumerable<Movie> Search(MovieFilters filters)
{
    string title = "";
    if (string.IsNullOrWhiteSpace(filters.Title) == false)
    {
        title = filters.Title.ToLower();
    }

    string genre = "";
    if (string.IsNullOrWhiteSpace(filters.Genre) == false)
    {
        genre = filters.Genre.ToLower();
    }

    return _moviesDbContext.Movies.Where( p => (p.Title.Trim().ToLower().Contains(title) | string.IsNullOrWhiteSpace(p.Title))
                                               & (p.Genre.Trim().ToLower().Contains(genre) | string.IsNullOrWhiteSpace(p.Genre))
                                               & (p.YearOfRelease == filters.YearOfRelease | filters.YearOfRelease == null)
                                        );
}