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POC# Interface<T> { T Func<T>(T t);} : Generic Interfaces with Parameterized Methods with Generic Return Types
 

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    <p>I thought I'd use some (what I thought was) simple generics to enforce CRUD on some Business Classes. eg. </p> <pre><code>public interface IReadable &lt;T&gt; { T Read&lt;T&gt;(string ID); } </code></pre> <p>and then perhaps, I could have a NoteAdapter to do C<strong>R</strong>UD with the Note class eg.</p> <pre><code>public class NoteAdapter : IReadable&lt;Note&gt; { public Note Read&lt;Note&gt;(string ID) { return new Note(); } } </code></pre> <p>But for some reason, te compiler is getting confused if I have both a generic return Type and a function Parameterized with the same generic Type. That is , if I do :</p> <pre><code>public interface IReadable &lt;T&gt; { void Read&lt;T&gt;(string ID); } public class NoteAdapter : IReadable&lt;Note&gt; { public void Read&lt;Note&gt;(string ID) { return new Note(); } } </code></pre> <p>It compiles fine, although it doesnt do what I want it to ! Also, this :</p> <pre><code>public interface IReadable &lt;T&gt; { T Read (string ID); } public class NoteAdapter : IReadable&lt;Note&gt; { public Note Read(string ID) { return new Note(); } } </code></pre> <p>works fine as well, <strong>Although it too does not satisfy the requirements</strong> ! -- Why ? Because then I can't have one Class that implements a bunch of these Interfaces ..eg.</p> <pre><code>public interface IReadable &lt;T&gt;{ T Read (string ID); } public class UniversalAdapter : IReadable&lt;Note&gt;, IReadable&lt;Customer&gt; ... { public Note Read(string ID) { return new Note(); } public Customer Read(string ID) { return new Customer(); } } </code></pre> <p>Coz this would not compile as return types are not part of the methods signature !</p> <p>I was under the impression, in C# 3.5 + </p> <pre><code>T Foo(T t); T Foo&lt;T&gt; (T t); T Foo(&lt;SomeType&gt; someInstance); </code></pre> <p>All have different signatures! What am I missing here ? </p>
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