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POHow can I overload a C# method by specific instances of a generic type
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  1. POHow can I overload a C# method by specific instances of a generic type
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    copied!<p>Coming from a C++ background, I've run into a snag with overloading based on a specific instance of a generic type. The following doesn't work since only once instance of the code for the <code>Foo&lt;T&gt;</code> class is ever generated, so inside the <code>Method</code>, the type of <code>this</code> is simply <code>Foo&lt;T&gt;</code>, not <code>Foo&lt;A&gt;</code> or <code>Foo&lt;B&gt;</code> as I'd hoped. In C++ I'm used to templates being instantiated as unique types.</p> <pre><code>using System.Collections.Generic; class A { // Concrete class } class B { // Concrete class } class Bar { public void OverloadedMethod(Foo&lt;A&gt; a) {} // do some A related stuff public void OverloadedMethod(Foo&lt;B&gt; b) {} // do some B related stuff public void OverloadedMethod(OtherFoo of) {} // do some other stuff public void VisitFoo(FooBase fb) { fb.Method(this); } } abstract class FooBase { public abstract void Method(Bar b); } class Foo&lt;T&gt; : FooBase { // Class that deals with As and Bs in an identical fashion. public override void Method(Bar b) { // Doesn't compile here b.OverloadedMethod(this); } } class OtherFoo : FooBase { public override void Method(Bar b) { b.OverloadedMethod(this); } } class Program { static void Main(string[] args) { List&lt;FooBase&gt; ListOfFoos = new List&lt;FooBase&gt;(); ListOfFoos.Add(new OtherFoo()); ListOfFoos.Add(new Foo&lt;A&gt;()); ListOfFoos.Add(new Foo&lt;B&gt;()); Bar b = new Bar(); foreach (FooBase fb in ListOfFoos) b.VisitFoo(fb); // Hopefully call each of the Bar::Overloaded methods } } </code></pre> <p>Is there a way to get something like this to work in C#? I'd rather not have to duplicate the code in Foo as separate classes for every type I want to use it for.</p> <p>Edit: Hopefully this is a little clearer.</p>
 

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