static void Main(string[] args)
{
Student[] studentArray =
{
new Student()
{
StudentID = 1, StudentName = "John", Age = 18
},
new Student()
{
StudentID = 2, StudentName = "Steve", Age = 21
},
new Student()
{
StudentID = 3, StudentName = "Bill", Age = 25
},
new Student()
{
StudentID = 4, StudentName = "Ram", Age = 20
},
new Student()
{
StudentID = 5, StudentName = "Ron", Age = 31
},
new Student()
{
StudentID = 6, StudentName = "Chris", Age = 17
},
new Student()
{
StudentID = 7, StudentName = "Rob", Age = 19
},
};
// Use LINQ to find teenager students
Student[] teenAgerStudents = studentArray.Where(s => s.Age > 12 && s.Age < 20).ToArray();
teenAgerStudents.ToList().ForEach(i => Console.WriteLine(i.StudentName.ToString()));
Console.WriteLine("");
// Use LINQ to find first student whose name is Bill
Student bill = studentArray.Where(s => s.StudentName == "Bill").FirstOrDefault();
Console.WriteLine(bill.StudentName);
Console.WriteLine("");
// Use LINQ to find student whose StudentID is 5
Student student5 = studentArray.Where(s => s.StudentID == 5).FirstOrDefault();
Console.WriteLine(student5.StudentName);
Console.WriteLine("");
// Use LINQ to find student whose names starts with R
Student[] studentsNamesR = studentArray.Where
(s => s.StudentName.StartsWith("R")).ToArray();
studentsNamesR.ToList().ForEach(i => Console.WriteLine(i.StudentName));
Console.WriteLine("");
// or using query syntax
var studentsNameRR = from s in studentArray
where s.StudentName.StartsWith("R")
select s;
studentsNameRR.ToList().ForEach(i => Console.WriteLine(i.StudentName));
Console.WriteLine("");
// other way af printing output
foreach (var s in studentsNameRR)
{
Console.WriteLine(s.StudentName);
}
Console.WriteLine("");
//delegate
IsTeenager isTeenager = delegate(Student s) { return(s.Age > 12 && s.Age < 20); };
Student stud = new Student()
{
Age = 25
};
Console.WriteLine(isTeenager(stud));
//delegate with 2 parameters
IsWanted isWanted = (s, age) => s.StudentName.StartsWith("R") && s.Age >= age;
// Student collection
IList <Student> studentList = new List <Student>()
{
new Student()
{
StudentID = 1, StudentName = "John", Age = 13
},
new Student()
{
StudentID = 2, StudentName = "Moin", Age = 21
},
new Student()
{
StudentID = 3, StudentName = "Bill", Age = 18
},
new Student()
{
StudentID = 4, StudentName = "Ram", Age = 20
},
new Student()
{
StudentID = 5, StudentName = "Ron", Age = 15
}
};
Console.WriteLine("");
var teenAgerStudent = studentList.Where
(s => s.StudentName.StartsWith("R") && s.Age >= 20);
Console.WriteLine("Teen age Students:");
foreach (Student std in teenAgerStudent)
{
Console.WriteLine(std.StudentName);
}
}
static void Main(string[] args)
{// IsTeenager checkAge = delegate (Student s) { return s.Age > 12 && s.Age < 20; };
IsTeenager checkIfTeenager = s => s.Age > 12 && s.Age < 20;
isYoungerThan checkIfYounger = (s, youngAge) => s.Age < youngAge;
isYoungerThan isYounger = (s, youngAge) =>
{
Console.WriteLine("Lamba expression with multiple statemnt in the body");
return(s.Age < youngAge);
};
isAdult checkIfAdult = (s) =>
{
int adultAge = 18;
Console.WriteLine("Lambda expression with multiple statements in the body");
return(s.Age >= adultAge);
};
Student stud1 = new Student()
{
Age = 23
};
Console.WriteLine(checkIfTeenager(stud1));
Console.WriteLine(checkIfYounger(stud1, 26));
Console.WriteLine(isYounger(stud1, 21));
Console.WriteLine(checkIfAdult(stud1));
Print print = () => Console.WriteLine("Thi is a parametr less lambda");
print();
Func <Student, bool> isStudentTeen = s => s.Age > 12 && s.Age < 20;
Student stud = new Student()
{
Age = 21
};
Console.WriteLine(isStudentTeen(stud));
Action <Student> PrintStudentDetails = s => Console.WriteLine("Name: {0}, Age: {1} ", s.Name, s.Age);
Student std = new Student()
{
Name = "Bill", Age = 45
};
PrintStudentDetails(std);
//Student collection
IList <Student> stdLits = new List <Student>()
{
new Student()
{
Id = 1, Name = "IOn1", Age = 11
},
new Student()
{
Id = 2, Name = "IOn2", Age = 17
},
new Student()
{
Id = 5, Name = "IOn3", Age = 19
},
new Student()
{
Id = 9, Name = "IOn5", Age = 24
},
new Student()
{
Id = 7, Name = "IOn7", Age = 18
},
};
Func <Student, bool> isStudentTeener = s => s.Age > 12 && s.Age < 20;
var teenager = stdLits.Where(isStudentTeen);
Console.WriteLine("teen age students:");
foreach (Student stds in teenager)
{
Console.WriteLine(stds.Name);
}
Func <Student, bool> isStudentATeen = s => s.Age > 12 && s.Age < 21;
var teenStudents = from s in stdLits
where isStudentATeen(s)
select s;
Console.WriteLine("teen age students2:");
foreach (Student stdss in teenStudents)
{
Console.WriteLine(stdss.Name);
}
}
