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POAbstract base class that inherits ICollection<T>
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  1. POAbstract base class that inherits ICollection<T>
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    copied!<p>Suppose I have an abstract base class <code>BaseTimeCollection</code> and at least one concrete class <code>ConcreteTimeCollection</code> which inherits from the base class.</p> <p>I would like my base class to inherit from <code>ICollection&lt;T&gt;</code>. </p> <p>Inheriting from <code>ICollection&lt;T&gt;</code> requires me to provide implementations for a number of methods, including <code>IEnumerable.GetEnumerator()</code> and <code>IEnumerable&lt;T&gt;.GetEnumerator</code>.</p> <p>I do not want to implement these methods in <code>BaseTimeCollection</code> - instead I would prefer to implement them individually in each of my concrete classes. </p> <p>This is where I run into trouble.</p> <p>The <code>GetEnumerator</code> methods need to be declared explicitly, because there are two of them both with the same name but different return types. However, it seems that as soon as I make the signature explicit I can no longer use the abstract modifier. Essentially I am forced to implement the <code>GetEnumerator</code> method in my base class. </p> <pre><code>public abstract class BaseTimeCollection : ICollection&lt;Time&gt; { abstract IEnumerator IEnumerable.GetEnumerator(); // compile error: The modifier 'abstract' is not valid for this item abstract IEnumerator&lt;Time&gt; IEnumerable&lt;Time&gt;.GetEnumerator(); // compile error: The modifier 'abstract' is not valid for this item } public class ConcreteTimeCollection : BaseTimeCollection { IEnumerator IEnumerable.GetEnumerator() { // this is where I would like to provide my implementation for IEnumerable.GetEnumerator() } IEnumerator&lt;Time&gt; IEnumerable&lt;Time&gt;.GetEnumerator() { // this is where I would like to provide my implementation for IEnumerable&lt;Time&gt;.GetEnumerator() } } </code></pre> <ol> <li><p>What have I missed? </p></li> <li><p>Is there some way I can defer implementation of the <code>GetEnumerator</code> methods to the concrete classes?</p></li> </ol>
 

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