static void Main()
{
Student[] ClassMates = new Student[]
{
new Student("Ivan", "Debelov", 23),
new Student("Georgi", "Groznev", 34),
new Student("Didi", "Smotleva", 23),
new Student("Ivailo", "Tupev", 43),
new Student("Delqn", "Anabolnii", 23),
};
Sort(ClassMates);
// 4. Write a LINQ query that finds the first name and last name of all students with age between 18 and 24.
var SortedClassMates =
from student in ClassMates
where student.Age > 18 && student.Age < 24
select student;
foreach (Student student in SortedClassMates)
{
Console.Write(student.FirstName + " ");
Console.Write(student.LastName + " ");
Console.Write(student.Age);
Console.WriteLine();
}
// 5.Using the extension methods OrderBy() and ThenBy() with lambda expressions sort the
// students by first name and last name in descending order. Rewrite the same with LINQ.
var OrderByAndThenBy = ClassMates.OrderBy((student) => student.FirstName).ThenBy((student) => student.LastName);
Console.WriteLine("\nWith OrderBy() and ThenBy()");
foreach (Student student in OrderByAndThenBy)
{
Console.Write(student.FirstName + " ");
Console.Write(student.LastName + " ");
Console.Write(student.Age);
Console.WriteLine();
}
// Leths do the same with LINQ
var withLINQ =
from student in ClassMates
orderby student.FirstName, student.LastName
select student;
Console.WriteLine("\nWith LINQ");
foreach (var student in withLINQ)
{
Console.Write(student.FirstName + " ");
Console.Write(student.LastName + " ");
Console.Write(student.Age);
Console.WriteLine();
}
}
static void Sort(Student[] ClassMates)
{
var SortedClassMates =
from student in ClassMates
where student.FirstName.CompareTo(student.LastName) < 0
select student;
foreach (Student student in SortedClassMates)
{
Console.Write(student.FirstName + " ");
Console.Write(student.LastName);
Console.WriteLine();
}
}