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I want to provide objects within a class library the ability to “output” messages without worrying about how it is being output. The class library could be used in a console app, a WinForm or WPF windows application, or a web page. I’d originally decided that I would use a delegate to handle this. I implemented this using classes but the compiler did not like the delegate when I attempted to put the delegate into an interface that each of these objects inherent from. I found that I could move the delegate out of the interface and then was able to compile but I'm not sure that this accomplishes what I am trying to do.. It also seems like a kludge so I wanted to ask if any of you have different ideas to accomplish this… The Interface: namespace Test { using System; using System.Xml.Linq; public interface IAction { DisplayMessageDelegate DisplayMessage(string message); void Execute(); XElement Serialize(XName elementName); } public delegate void DisplayMessageDelegate(string message); } From there, I'm not sure how to implement this behavior: (BTW, I know that this code will not compile...) public class ActionClass1 : IAction { // Other methods not shown... void Execute() { if (this.DisplayMessage != null) { this.DisplayMessage(“Hello”); } } } public class ConsoleClass { ActionClass1 class1 = new ActionClass1(); class1.DisplayMessage = { x => Console.WriteLine(x); }; } public class WinFormClass { ActionClass1 class1 = new ActionClass1(); Class1.DisplayMessage = {x => DisplayTextBox.Text = x; }; }

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