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POC# declare both, class and interface
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copied!<pre><code>// interface public interface IHasLegs { ... } // base class public class Animal { ... } // derived classes of Animal public class Donkey : Animal, IHasLegs { ... } // with legs public class Lizard : Animal, IHasLegs { ... } // with legs public class Snake : Animal { ... } // without legs // other class with legs public class Table : IHasLegs { ... } public class CageWithAnimalsWithLegs { public List<??> animalsWithLegs { get; set; } } </code></pre> <p>What should I put in the ?? to force objects that inherit from both <code>Animal</code> and <code>IHasLegs</code>? I don't want to see a <code>Snake</code> in that cage neither a <code>Table</code>.</p> <p>-------------- EDIT --------------</p> <p>Thank you all for your answers, but here is the thing: What I actually want to do is this:</p> <pre><code>public interface IClonable { ... } public class MyTextBox : TextBox, IClonable { ... } public class MyComboBox : ComboBox, IClonable { ... } </code></pre> <p>TextBox/ComboBox is of course a Control. Now if I make an abstract class that inherits both Control and IClonable, I will loose the TextBox/ComboBox inheritance that I need. Multiple class inheritance is not allowed, so I have to work with interfaces. Now that I think of it again, I could create another interface that inherits from IClonable:</p> <pre><code>public interface IClonableControl : IClonable { ... } public class MyTextBox : TextBox, IClonableControl { ... } public class MyComboBox : ComboBox, IClonableControl { ... } </code></pre> <p>and then</p> <pre><code>List<IClonableControl> clonableControls; </code></pre> <p>Thank you!!</p>

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