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POCustom Collection using IEnumerable vs ICollection vs IList
 

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    <p>I need to design my own custom <code>GenericCollection</code> class. Now i have plenty of options to derive it using <code>IEnumerable</code>, <code>ICollection</code>, and <code>IList</code>, where later offers some added functionalities.</p> <p>I am little confused that if i go with <code>IEnumerable&lt;T&gt;</code> i might require declaring the object to actually hold the collection like in this case <code>_list</code>.</p> <pre><code>public class GenericCollection&lt;T&gt; : IEnumerable&lt;T&gt; { private List&lt;T&gt; _list; //... } </code></pre> <p>But if i go with <code>ICollection&lt;T&gt;</code> or <code>IList&lt;T&gt;</code>, i do not require to declare the <code>List</code> object as it is implicitly available.</p> <pre><code>public class GenericCollection&lt;T&gt; : IList&lt;T&gt; { // no need for List object //private List&lt;T&gt; _list; //... } </code></pre> <p>What is the difference between these two approaches with respect to <em>performance</em>?</p> <p>In which scenario each one is preferred especially when it comes to designing your own collection. I am interested in the light weight collection with good performance. I think this can be achieved using <code>IEnumerable&lt;T&gt;</code> but how exactly along with some strong reasons to go with it?</p> <p>I have reviewed some existing posts but none is giving required information.</p> <p><a href="https://stackoverflow.com/questions/9855693/ilist-vs-icollection-vs-collection">Returning &#39;IList&#39; vs &#39;ICollection&#39; vs &#39;Collection&#39;</a></p>
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    1. USFurqan Safdar
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    1. COyou are not required to have _list member in the first example. In addition, you still have to implement some storage mechanisms in case of inhering from IList and implementing public interface with respect to IList
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