Example 1
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ChainOfResponsibility
{
public interface IHandler
{
IHandler SetNext(IHandler handler);
object Handle(object
request);
}
abstract class BoilerAbstractHandler : IHandler
{
private IHandler _nextHandler;
public IHandler SetNext(IHandler handler)
{
this._nextHandler = handler;
return handler;
}
public virtual object Handle(object request)
{
if (this._nextHandler
!= null)
{
return this._nextHandler.Handle(request);
}
else
{
return null;
}
}
}
class BoilerOneHandler : BoilerAbstractHandler
{
public override object Handle(object request)
{
if ((request as string) == "MILK")
{
return $"Adding {request.ToString()}.\n";
}
else
{
return base.Handle(request);
}
}
}
class BoilerTwoHandler : BoilerAbstractHandler
{
public override object Handle(object request)
{
if (request.ToString() == "SUGAR")
{
return $"Adding {request.ToString()}.\n";
}
else
{
return base.Handle(request);
}
}
}
class BoilerThreeHandler : BoilerAbstractHandler
{
public override object Handle(object request)
{
if (request.ToString() == "BUTTER")
{
return $"Adding {request.ToString()}.\n";
}
else
{
return base.Handle(request);
}
}
}
class Client
{
public static void ClientCode(BoilerAbstractHandler
handler)
{
foreach (var ingredient in new List<string> { "MILK", "SUGAR", "BUTTER" })
{
var result = handler.Handle(ingredient);
if (result != null)
{
Console.Write($" {result}");
}
else
{
Console.WriteLine($" {ingredient} was added.");
}
}
}
}
class Program
{
static void Main(string[] args)
{
var BoilerOne = new
BoilerOneHandler();
var BoilerTwo = new
BoilerTwoHandler();
var BoilerThree = new BoilerThreeHandler();
BoilerOne.SetNext(BoilerTwo).SetNext(BoilerThree);
Console.WriteLine("Chain: BoilerOne > BoilerTwo > BoilerThree\n");
Client.ClientCode(BoilerOne);
Console.WriteLine();
Console.WriteLine("Subchain: BoilerTwo > BoilerThree\n");
Client.ClientCode(BoilerTwo);
}
}
}
Example 2
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ChainOfResponsibility01
{
public class LoanEventArgs : EventArgs
{
internal Loan Loan { get; set; }
}
/// The 'Handler' abstract class
abstract class Approver
{
// Loan event
public EventHandler<LoanEventArgs> Loan;
// Loan event
handler
public abstract void
LoanHandler(object sender,
LoanEventArgs e);
// Constructor
public Approver()
{
Loan += LoanHandler;
}
public void
ProcessRequest(Loan loan)
{
OnLoan(new LoanEventArgs { Loan = loan });
}
// Invoke the
Loan event
public virtual void OnLoan(LoanEventArgs e)
{
if (Loan != null)
{
Loan(this, e);
}
}
// Sets or gets
the next approver
public Approver Successor { get; set; }
}
/// The 'ConcreteHandler' class
class Clerk : Approver
{
public override void
LoanHandler(object sender,
LoanEventArgs e)
{
if (e.Loan.Amount < 25000.0)
{
Console.WriteLine("{0} approved request# {1}",
this.GetType().Name, e.Loan.Number);
}
else if (Successor != null)
{
Successor.LoanHandler(this, e);
}
}
}
/// The 'ConcreteHandler' class
class AssistantManager : Approver
{
public override void
LoanHandler(object sender,
LoanEventArgs e)
{
if (e.Loan.Amount < 45000.0)
{
Console.WriteLine("{0} approved request# {1}",
this.GetType().Name, e.Loan.Number);
}
else if (Successor != null)
{
Successor.LoanHandler(this, e);
}
}
}
/// The 'ConcreteHandler' clas
class Manager : Approver
{
public override void
LoanHandler(object sender,
LoanEventArgs e)
{
if (e.Loan.Amount < 100000.0)
{
Console.WriteLine("{0} approved request# {1}",
sender.GetType().Name,
e.Loan.Number);
}
else if (Successor != null)
{
Successor.LoanHandler(this, e);
}
else
{
Console.WriteLine(
"Request#
{0} requires an executive meeting!",
e.Loan.Number);
}
}
}
class Loan
{
public double Amount {
get; set; }
public string Purpose
{ get; set; }
public int Number {
get; set; }
}
class Program
{
static void Main(string[] args)
{
// Setup Chain
of Responsibility
Approver David = new Clerk();
Approver George = new AssistantManager();
Approver Nicky = new Manager();
David.Successor = George;
George.Successor = Nicky;
// Generate and
process loan requests
var loan = new Loan {
Number = 2034, Amount = 24000.00, Purpose = "Laptop
Loan" };
David.ProcessRequest(loan);
loan = new Loan { Number = 2035, Amount =
42000.10, Purpose = "Bike Loan" };
George.ProcessRequest(loan);
loan = new Loan { Number = 2036, Amount =
156200.00, Purpose = "House Loan" };
George.ProcessRequest(loan);
// Wait for
user
Console.ReadKey();
}
}
}
//EnteringData
//Collecting
//Sorting
//Bucketing
//Cleansing
//ProperFormatting
