Proxy_Class.cs

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using System;
 
 
namespace DesignPatternExamples_csharp
{
    public interface IWorkByProxy
    {
        string DoWork(string someArgument);
    }
 
 
    //========================================================================
    //========================================================================
 
 
    static class Proxy_Classes_Container
    {
        private class Real_Class : IWorkByProxy
        {
            // Implementation of the IWorkByProxy interface
            string IWorkByProxy.DoWork(string someArgument)
            {
                return String.Format("Real class received '{0}'", someArgument);
            }
        }
 
        //====================================================================
        //====================================================================
 
 
        private class Proxy_Class : IWorkByProxy
        {
            IWorkByProxy? _realClassInstance;
 
            private IWorkByProxy _GetRealClass()
            {
                if (_realClassInstance == null)
                {
                    Console.WriteLine("  --> Creating instance of real class...");
                    _realClassInstance = new Real_Class();
                }
                return _realClassInstance;
            }
 
 
            // Implementation of the IWorkByProxy interface
            
            string IWorkByProxy.DoWork(string someArgument)
            {
                Console.WriteLine("  --> proxy class DoWork() in");
                IWorkByProxy realClass = _GetRealClass();
                Console.WriteLine("  --> Forwarding DoWork() call to real class...");
                return realClass.DoWork(someArgument);
            }
        }
 
 
        //====================================================================
        //====================================================================
 
 
        //---------------Public Methods ------------------------------------//
 
        static public IWorkByProxy CreateProxy()
        {
            Console.WriteLine("  --> Creating instance of proxy class...");
            return new Proxy_Class();
        }
    }
}