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POHow can i use Table Driven methods with delegate and Dictionary?
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copied!<p>Hi i have been exhausted too many if comparization. and switch case methods. i have been read below issue: </p> <p><a href="https://stackoverflow.com/questions/214017/best-table-enum-driven-method-calling-system">Best table / enum driven method calling system</a></p> <p>this usage is good. Look Vivek's responses. </p> <p>My usage Below but i can not this. </p> <pre><code> namespace DelegateKavrami { class Program { static void Main(string[] args) { new MyTest().Run(); Console.Read(); } } public class MyTest { public void Run() { MyMessageProcessor myProcessor = new MyMessageProcessor(); myProcessor.Register(0, Sms); myProcessor.Register(1, Mms); myProcessor.ProcessMessage(1, Message.Sms); } public void Sms(Message message) { Console.WriteLine("Sms olarak gönderilen mesaj"); } void Mms(Message message) { Console.WriteLine("Mms olarak gönderilen mesaj:"); } } public class MyMessageProcessor { public delegate void ProcessMessageDelegate(Message message); Dictionary methods; public void Register(int messageType, ProcessMessageDelegate processMessage) { methods[messageType] = processMessage; } public void ProcessMessage(int messageType, Message message) { if (methods.ContainsKey(messageType)) { methods[messageType](message); } } } public enum Message { Sms,Mms } } </code></pre> <p>But my Dream</p> <h3> myProcessor.ProcessMessage(1)</h3> <p>How can i use this? Error after above code runnig: Object reference not set to an instance of an object. ON methods[messageType] = processMessage;</p>

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