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copied!<p>I have an interface defined like so:</p> <pre><code>public interface IRipper { IRipperHost Host { get; set; } void Rip(FileStream stream); event RipperEventHandler OnStart; event RipperEventHandler OnComplete; event RipperEventHandler OnProgressChanged; } public delegate void RipperEventHandler(object sender, RipperEventArgs e); </code></pre> <p>and a base class that implements that interface</p> <pre><code>public class RipperBase : IRipper { public void Rip(FileStream stream) { throw new System.NotImplementedException(); } public event RipperEventHandler PostRipEvent; event RipperEventHandler IRipper.OnComplete { add { if (PostRipEvent != null) { lock (PostRipEvent) { PostRipEvent += value; } } else { PostRipEvent = value; } } remove { if (PostRipEvent != null) { lock (PostRipEvent) { PostRipEvent -= value; } } } } ... and so on } </code></pre> <p>My question is how would <strong><em>you</em></strong> inherit from RipperBase and override the BaseClass Rip method. in reality that function should be abstract - but i don't know how to do that with interfaces. </p> <p>Also how can i call the base classes event handler from the class derived from RipperBase? I tried this</p> <pre><code> RipperEventHandler handler = PreRipEvent; if (handler != null) { handler(this, new RipperEventArgs { Message = "Started Ripping file to CSV!" }); } handler = RipProgEvent; </code></pre> <p>this but I'm getting the "event can only appear on the left hand side of += or -=." error</p> <p>any help would be greatly appreciated! I'm trying to make this as scalable as possible. </p>

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