//[5.2]
public static Student[] DescendingSort(Student[] list)
{
var Desc =
from person in list
orderby person.FirstName descending, person.LastName descending
select person;
return Desc.ToArray<Student>();
}
//[3]
public static Student[] FirstBeforeLastName(Student[] list)
{
var firstLastName =
from person in list
where string.Compare(person.FirstName, person.LastName) < 0
select person;
return firstLastName.ToArray<Student>();
}
//[4]
public static Student[] Between18And24(Student[] list)
{
var from18To24 =
from person in list
where ((person.Age() >= 18) && (person.Age() <= 24))
select person;
return from18To24.ToArray<Student>();
}
//[5.1]
public static Student[] SortDesc(Student[] list)
{
var Sort = list.OrderByDescending(s => s.FirstName).ThenByDescending(s => s.LastName);
return Sort.ToArray<Student>();
}