public static void DescendingSortLambda(Student[] studentArr)
{
var sorted =
studentArr.OrderByDescending(x => x.FirstName).ThenByDescending(y => y.LastName);
foreach (var student in sorted)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
}
public static void DescendingSortLINQ(Student[] studentArr)
{
var sorted =
from student in studentArr
orderby student.FirstName descending, student.LastName descending
select student;
foreach (var student in sorted)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
}
//Methods with LINQ query operators
public static void FindStudentByName(Student[] studentArr)
{
var findedStudents =
from student in studentArr
where student.FirstName.CompareTo(student.LastName) < 0
select student;
int count = 0;
foreach (var student in findedStudents)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
count++;
}
if (count == 0)
{
Console.WriteLine("There aren`t any students that satisfy the conditions");
}
}
public static void FindStudentByAge(Student[] studentArr)
{
var find =
from student in studentArr
where student.Age > 17 && student.Age < 25
select student;
int count = 0;
foreach (var student in find)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
count++;
}
if (count == 0)
{
Console.WriteLine("There aren`t student between 18 and 24.");
}
}
static void Main()
{
Student[] studentArr = new Student[3];
studentArr[0] = new Student("Pesho", "Georgiev", 18);
studentArr[1] = new Student("Ilian", "Ivanov", 24);
studentArr[2] = new Student("Georgi", "Siromahov", 25);
//Test methods
Console.WriteLine("Students which first name is before its last name alphabetically:");
Student.FindStudentByName(studentArr);
Console.WriteLine();
Console.WriteLine("Students between 18 and 24:");
Student.FindStudentByAge(studentArr);
Console.WriteLine();
Console.WriteLine("Sorted students in descending order with Lambda expressions:");
Student.DescendingSortLambda(studentArr);
Console.WriteLine();
Console.WriteLine("Sorted students in descending order with LINQ:");
Student.DescendingSortLINQ(studentArr);
}
