static void Main(string[] args)
{
var searchParameters = new BirdSearch
{
Size = "Medium",
Country = "United States",
Colors = new List <string> {
"White", "Brown", "Black"
},
Page = 0,
PageSize = 5
};
Console.WriteLine("Type any key to begin search");
var birds = BirdRepository.LoadBirds();
while (Console.ReadKey().KeyChar != 'q')
{
Console.WriteLine($"Page: {searchParameters.Page}");
birds.Search(searchParameters).ToList().ForEach(b =>
{
Console.WriteLine($"Common Name: {b.CommonName}");
});
searchParameters.Page++;
}
}
public static IEnumerable <Bird> Search(this IEnumerable <Bird> source, BirdSearch search)
{
return(source.Where(s => search.CommonName == null || s.CommonName.Contains(search.CommonName))
.Where(s => search.Country == null || s.Habitats.Any(h => h.Country.Contains(search.Country)))
.Where(s => search.Size == null || s.Size == search.Size)
.Where(s => search.Colors.Any(c => c == s.PrimaryColor) ||
search.Colors.Any(c => c == s.SecondaryColor) ||
search.Colors.Join(s.TertiaryColors,
sc => sc,
tc => tc,
(sc, tc) => (sc)).Any())
.Skip(search.Page * search.PageSize)
.Take(search.PageSize));
}
public static IEnumerable <Bird> Search(this IEnumerable <Bird> source, BirdSearch search)
{
return(source.Where(s => search.CommonName == null || s.CommonName.Contains(search.CommonName))
.Where(s => search.Country == null || s.Habitats.Any(h => h.Country.Contains(search.Country)))
.Where(s => search.Size == null || s.Size == search.Size)
.Where(s => search.Colors.Any(c => c == s.PrimaryColor) ||
search.Colors.Any(c => c == s.SecondaryColor) ||
search.Colors.Join(s.TertiaryColors,
sc => cs,
tc => tc,
(sc, tc) => (sc)).Any())
// now all of our colors are in our filter
// now to deal with the Page and PageSize parameters using Skip and Take.
.Skip(search.Page * search.PageSize) // will skip ahead as many elements as returned to make sure nothing is missed for the user
.Take(search.PageSize));
// now that's all of our search logic in one LINQ expression
// just ignore all the errors, i guess...
}
