static void Main()
{
var myStr = new StringBuilder("Proba");
Console.WriteLine(myStr.Substring(0, 3));
var myCollection = new[] { 1, 2, 3, 4, 5, 13 };
Console.WriteLine("Average -> {0}", myCollection.Average());
Console.WriteLine("Product -> {0}", myCollection.Product());
Console.WriteLine();
var students = new Student[4];
students[0] = new Student
{
FirstName = "Ivan",
LastName = "Georgiev",
Age = 19,
GroupNumber = 1,
Email = "*****@*****.**",
Tel = "0888123456",
Marks = new List<int> { 6, 6 },
FN = 123406789,
};
students[1] = new Student
{
FirstName = "Ana",
LastName = "Georgieva",
Age = 17,
GroupNumber = 1,
Email = "[email protected]",
Tel = "02/8123456",
Marks = new List<int> { 2, 2, 4 },
FN = 123406789,
};
students[2] = new Student
{
FirstName = "Gergana",
LastName = "Hristova",
Age = 21,
GroupNumber = 2,
Email = "*****@*****.**",
Tel = "0888123456",
Marks = new List<int> { 6, 3, 6, 4 },
FN = 123405789,
};
students[3] = new Student
{
FirstName = "Ivan",
LastName = "Antonov",
Age = 25,
GroupNumber = 2,
Email = "*****@*****.**",
Tel = "028123458",
Marks = new List<int> { 4, 3 },
FN = 123404789,
};
var result = Check.ExtMethods.FirstBeforeLast(students);
Print(result);
result = Check.ExtMethods.AgeRange(students, 18, 24);
Print(result);
result = students
.OrderByDescending(x => x.FirstName)
.ThenByDescending(x => x.LastName)
.ToArray();
Print(result);
var linkResult =
from student in students
where student.GroupNumber == 2
orderby student.FirstName
select student;
Print(linkResult);
result = students
.Where(x => x.GroupNumber == 2)
.OrderBy(x => x.FirstName)
.ToArray();
Console.WriteLine("Students in group 2 are (selected by Lambda):");
Print(result);
result = students
.Where(x => x.Email.Substring(x.Email.IndexOf('@') + 1).Equals("abv.bg"))
.ToArray();
Console.WriteLine("Student(s) with email in abv.bg is/are:");
Print(result);
var resultSofiaPhone =
from student in students
where student.Tel.StartsWith("02")
select student;
Console.WriteLine("Student(s) with phone in Sofia is/are:");
Print(resultSofiaPhone);
var excellentStudents =
from student in students
where student.Marks.Contains(6)
select new { FullName = student.FirstName + " " + student.LastName, Marks = string.Join(", ", student.Marks) };
Console.WriteLine(string.Join(", ", excellentStudents));
Console.WriteLine();
result = students
.Where(x => x.Marks.Count == 2)
.ToArray();
Console.WriteLine("Students with exactly two marks:");
Print(result);
var marks = students
.Where(x => x.FN.ToString().Substring(4, 2) == "06")
.Select(x => x.Marks);
Console.WriteLine("All marks in 2006");
foreach (var mark in marks)
{
Console.WriteLine(string.Join(", ", mark));
}
var res =
from x in students
group x by x.GroupNumber;
Console.WriteLine("Students in groups:");
foreach (var group in res)
{
Console.Write("Group ");
Console.WriteLine(group.Key);
foreach (var st in group)
{
Console.WriteLine(st);
}
}
Console.WriteLine();
var resLambda = students
.GroupBy(x => x.GroupNumber);
Console.WriteLine("Students in groups (Lambda):");
foreach (var group in resLambda)
{
Console.Write("Group ");
Console.WriteLine(group.Key);
foreach (var st in group)
{
Console.WriteLine(st);
}
}
}
public static void Main()
{
var student = new Student("Ivan", "Georgiev", "123-01-5678");
Console.WriteLine(student);
}
