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POCan you pass an instance of a generic type to other strongly-typed methods?
 

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  1. POCan you pass an instance of a generic type to other strongly-typed methods?
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    <p>I have a situation where I have a method that takes a couple of overloads. I have a fairly common scenario where if some condition is true, I call one of the overloads, otherwise I call something else. I decided to try to be clever and refactor the common code into a single generic method that would take an object and a condition, and call the overloaded method or otherwise call the common code.</p> <p>A much simplified example of the code: </p> <pre><code>/// &lt;summary&gt; /// Dummy interface /// &lt;/summary&gt; public interface ITest1 { } /// &lt;summary&gt; /// Dummy interface /// &lt;/summary&gt; public interface ITest2 { } /// &lt;summary&gt; /// Generic Class /// &lt;/summary&gt; public class GenericClass { /// &lt;summary&gt; /// First overload /// &lt;/summary&gt; /// &lt;param name="test1"&gt;&lt;/param&gt; public void TestMethod(ITest1 test1) { } /// &lt;summary&gt; /// Second overload /// &lt;/summary&gt; /// &lt;param name="test2"&gt;&lt;/param&gt; public void TestMethod(ITest2 test2) { } /// &lt;summary&gt; /// method with common logic /// &lt;/summary&gt; /// &lt;typeparam name="TInterfaceType"&gt; /// Type of the test object /// &lt;/typeparam&gt; /// &lt;param name="test"&gt; /// Test object to pass to the method. /// &lt;/param&gt; public void ConditionallyCallTest&lt;TInterfaceType&gt;( TInterfaceType test, bool someLogic) { if (someLogic) { this.TestMethod(test); } else { // .. Perform Common operations here } } } </code></pre> <p>Ignoring the fact that this doesn't do anything, if you compile this code segment, you will get a compiler error that it can't convert TInterfaceType to ITest1.</p> <p>I was hoping for the compiler to wait until I specified the type to do the type checking, so:</p> <pre><code>GenericClass g = new GenericClass(); // We have an overload, so this is OK: g.ConditionallyCallTest&lt;ITest1&gt;(test1); // We have an overload, so this is OK: g.ConditionallyCallTest&lt;ITest2&gt;(test2); // Compiler error, no overload available: g.ConditionallyCallTest&lt;UnknownType&gt;(obj); </code></pre> <p>Is it possible to do something like this using C#?</p> <p>I also tried to use the where clause to specify the allowable types, but I couldn't figure out how to get the where clause to specify an either/or relationship between the specified types, only an AND relationship.</p> <p>EDIT</p> <p>As I <a href="https://stackoverflow.com/questions/644841/can-you-pass-an-instance-of-a-generic-type-to-other-strongly-typed-methods/644883#644883">mentioned in the comments below</a>, I was attempting to avoid having to create matching overload methods, so are there any other suggestions to solve this problem, or am I limited by the language here?</p>
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    1. USBrian B.
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    1. COAre you writing unit tests of some sort? Or is "Test" just a dummy name?
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    2. COThis was just a made-up example of the problem since the real code is too extensive to post.
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