//Takes a list of Employees and a Delegate.
public static void PromoteEmployee(List <Employee> lstEmployees, EligibleToPromoteDelegate IsEmployeeEligible)
{
//Loops thru each employee object.
foreach (Employee employee in lstEmployees)
{
//Passes employee to the delegate.
//No hard coded logic on how to promote employee.
if (IsEmployeeEligible(employee))
{
Console.WriteLine("Employee {0} Promoted", employee.Name);
}
}
}
public static void IsEligibleToPromote(List <Employee> employeeList, EligibleToPromoteDelegate eligibleToPromoteDelegate)
{
foreach (Employee emp in employeeList)
{
if (eligibleToPromoteDelegate(emp))
{
Console.WriteLine("Promotable");
}
else
{
Console.WriteLine("Not Promotable");
}
}
}
static void Main(string[] args)
{
//Get list of employees.
List <Employee> lstEmployees = new List <Employee>();
lstEmployees = GetEmployeeList();
//Assign Promote() to delegate.
EligibleToPromoteDelegate promoteMethod = new EligibleToPromoteDelegate(Program.Promote);
//Promote employees.
Employee.PromoteEmployee(lstEmployees, promoteMethod);
Console.ReadKey();
}
static void Main(string[] args)
{
List <Employee> employeeList = new List <Employee>()
{
new Employee()
{
Id = 1, Name = "John", Experience = 5
},
new Employee()
{
Id = 2, Name = "Mark", Experience = 7
},
new Employee()
{
Id = 3, Name = "George", Experience = 2
},
new Employee()
{
Id = 4, Name = "Bill", Experience = 6
},
new Employee()
{
Id = 1, Name = "Cannor", Experience = 9
}
};
// Here we are able to call different Bussiness logic without without
Console.WriteLine("____________________________________Employee with exp > 5_____________________________________");
EligibleToPromoteDelegate eligibleToPromote = new EligibleToPromoteDelegate(Promote);
//IsEligibleToPromote(employeeList, eligibleToPromote);
Employee.IsEligibleToPromote(employeeList, eligibleToPromote);
Console.WriteLine("____________________________________Employee with exp > 3_____________________________________");
EligibleToPromoteDelegate eligibleToPromote3 = new EligibleToPromoteDelegate(Promote3);
Employee.IsEligibleToPromote(employeeList, eligibleToPromote3);
//IsEligibleToPromote(employeeList, eligibleToPromote3);
//The Function Pointer Delegate got replaced with Lambda expression
Console.WriteLine("____________________________________Employee with exp > 5_____________________________________");
Employee.IsEligibleToPromote(employeeList, x => x.Experience > 5);
Console.ReadKey();
}