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Understanding and Implementing Chain of Responsibility Pattern in C#

, 15 Nov 2012
This article talks about the Chain of responsibility pattern.
ChainOfResponsibilityDemo.zip
ChainOfResponsibilityDemo
ChainOfResponsibilityDemo
ActionItem
ClassDiagram1.cd
ConcreteHandlers
Handler
Properties
ChainOfResponsibilityDemo.suo
using System;
using System.Collections.Generic;
using System.Text;

namespace ChainOfResponsibilityDemo
{
    public class TeamLeader : Employee
    {
        // team leas can only approve upto 7 days of leave
        const int MAX_LEAVES_CAN_APPROVE = 10;

        // in constructor we will attach the event handler that
        // will check if this employee can process or he need to
        // pass on to next employee
        public TeamLeader()
        {
            this.onLeaveApplied += new OnLeaveApplied(TeamLeader_onLeaveApplied);
        }

        // in this function we will check if this employee can 
        // process or he need to pass on to next employee
        void TeamLeader_onLeaveApplied(Employee e, Leave l)
        {
            // check if we can process this request
            if (l.NumberOfDays < MAX_LEAVES_CAN_APPROVE)
            {
                // process it on our level only
                ApproveLeave(l);
            }
            else
            {
                // if we cant process pass on to the supervisor 
                // so that he can process
                if (Supervisor != null)
                {
                    Supervisor.LeaveApplied(this, l);
                }
            }
        }

        // If we can process lets show the output
        public override void ApproveLeave(Leave leave)
        {
            Console.WriteLine("LeaveID: {0} Days: {1} Approver: {2}", 
                leave.LeaveID, leave.NumberOfDays, "Team Leader");
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Rahul Rajat Singh
Software Developer (Senior)
India India
I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.
  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4
 
If you like my articles, please visit my website for more: www.rahulrajatsingh.com[^]
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