How to add a delegate to an interface C#

Question

I need to have some delegates in my class.

I'd like to use the interface to "remind" me to set these delegates.

How to?

My class look like this:

public class ClsPictures : myInterface {     // Implementing the IProcess interface     public event UpdateStatusEventHandler UpdateStatusText;     public delegate void UpdateStatusEventHandler(string Status);      public event StartedEventHandler Started;     public delegate void StartedEventHandler(); } 

I need an interface to force those delegates:

public interface myInterface {    // ????? } 

Answer 1

Those are declaring delegate types. They don't belong in an interface. The events using those delegate types are fine to be in the interface though:

public delegate void UpdateStatusEventHandler(string status); public delegate void StartedEventHandler();  public interface IMyInterface {            event UpdateStatusEventHandler StatusUpdated;         event StartedEventHandler Started; } 

The implementation won't (and shouldn't) redeclare the delegate type, any more than it would redeclare any other type used in an interface.

Answer 2

Since .NET 3.5 you can also use the System.Action delegates, without the need to declare your own type.

This would result in the following interface:

public interface myInterface {           // Implementing the IProcess interface    event Action<String> UpdateStatusText;     event Action Started; }