using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DelegateApp
{
/// <summary>
/// A class to define a person
/// </summary>
public class Person
{
public string Name { get; set; }
public int Age { get; set; }
public string Address { get; set; }
}
class Program
{
//Our delegate
public delegate bool FilterDelegate(Person p);
static void Main(string[] args)
{
//Create 4 Person objects
Person p1 = new Person() { Name = "John", Age = 41 ,Address ="Hyd"};
Person p2 = new Person() { Name = "Jane", Age = 69 ,Address = "Blr"};
Person p3 = new Person() { Name = "Jake", Age = 12 , Address ="NLR" };
Person p4 = new Person() { Name = "Jessie", Age = 25,Address ="Chennai" };
//Create a list of Person objects and fill it
List<Person> people = new List<Person>() { p1, p2, p3, p4 };
DisplayPeople("Children:", people, IsChild);
DisplayPeople("Adults:", people, IsAdult);
DisplayPeople("Seniors:", people, IsSenior);
DisplayPeople("Middle Age:", people, MiddleAge);
List<Person> test = new List<Person>() { p1 };
TestDisplay("testing data", test);
Console.Read();
}
/// <summary>
/// A method to filter out the people you need
/// </summary>
/// <param name="people">A list of people</param>
/// <param name="filter">A filter</param>
/// <returns>A filtered list</returns>
///
static void TestDisplay(string title1, List<Person> test)
{
Console.WriteLine(title1);
foreach (Person t in test)
{
Console.WriteLine(" {0} ,{1} years of testing data", t.Name, t.Age);
}
}
static void DisplayPeople(string title, List<Person> people, FilterDelegate filter)
{
Console.WriteLine(title);
foreach (Person p in people)
{
if (filter(p))
{
Console.WriteLine("{0}, {1} years old", p.Name, p.Age ,p.Address );
}
}
Console.Write("\n\n");
}
//==========FILTERS===================
static bool IsChild(Person p)
{
return p.Age <= 18;
}
static bool IsAdult(Person p)
{
return p.Age >= 18;
}
static bool IsSenior(Person p)
{
return p.Age >= 65;
}
static bool MiddleAge(Person p)
{
return p.Age >= 18 && p.Age <= 40;
}
}
}
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Delegates Overview |
