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Understanding and Implementing Chain of Responsibility Pattern in C#

, 15 Nov 2012 CPOL
This article talks about the Chain of responsibility pattern.
using System;
using System.Collections.Generic;
using System.Text;

namespace ChainOfResponsibilityDemo
    class HR : Employee
        const int MAX_LEAVES_CAN_APPROVE = 30;

        // in constructor we will attach the event handler that
        // will check if this employee can process or 
        // some other action is needed
        public HR()
            this.onLeaveApplied += new OnLeaveApplied(HR_onLeaveApplied);

        // in this function we will check if this employee can 
        // process or some other action is needed
        void HR_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
                // if we cant process pass on to the supervisor 
                // so that he can process
                if (Supervisor != null)
                    Supervisor.LeaveApplied(this, l);
                    // There is no one up in hierarchy so lets 
                    // tell the user what he needs to do now
                    Console.WriteLine("Leave application suspended, Please contact HR");

        // 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, "HR");

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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:[^]

  • Microsoft MVP 2015

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