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POConvert Class<T> Where T : IMySampleInterface to Class<IMySampleInterface >
 

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    <p>Is it possible to convert <code>Class&lt;T&gt; Where T : IMySampleInterface</code> to <code>Class&lt;IMySampleInterface&gt;</code></p> <p>Example:</p> <pre><code>public abstract class AbstractCommunication: ICommunication { private ICommunicationCallback&lt;ICommunication&gt; callback = null; public void registerCommunicationCallback&lt;T&gt;(ICommunicationCallback&lt;T&gt; callback) where T : ICommunication { this.callback = (ICommunicationCallback&lt;ICommunication&gt;)callback; //&lt;--DOESNT WORK } } </code></pre> <p>In my Example the following exception occurs: <code>System.InvalidCastException</code></p> <p>Edit:</p> <pre><code>public interface ICommunicationCallback&lt;T&gt; where T : ICommunication { void onCommunicationCallback(T sender, String data); } </code></pre> <p>why do i use this way: If I have a base class that should implement for example two Callbacks than i could simply use the following:</p> <pre><code>public class TestClass : ICommunicationCallback&lt;TestClass1&gt;, ICommunicationCallback&lt;TestClass2&gt; </code></pre> <p>TestClass1:</p> <pre><code>public class TestClass1: AbstractCommunication { } </code></pre> <p>TestClass2:</p> <pre><code>public class TestClass2: AbstractCommunication { } </code></pre> <p>Edit: "if T is always an ICommunication, then why keep it generic? – Davin Tryon 20 mins ago" Im locking at this point</p> <p>Okay Without the generics i got the same error but different <code>System.InvalidCastException</code>: (That is why i used generics in the first place - i remember now)</p> <pre><code> public class DocumentTest : ICommunicationCallback&lt;GetDocumentData&gt; { public void callAsync() { CommunicationFactory comFactory = new CommunicationFactory(communicationServiceClient); GetDocumentData getDocumentData = (GetDocumentData)comFactory.createCommunicationObject(CommunicationFactory.ENTITY_TYPE.GET_DOCUMENT_DATA,(ICommunicationCallback&lt;ICommunication&gt; ) this); } } public interface ICommunicationCallback&lt;ICommunication&gt; { void onCommunicationCallback(ICommunication sender, String data); } </code></pre> <p>I Think using generics is the only solution in my case - see: "This feature works only for generic interfaces and delegates. If you implement a variant generic interface, the implementing class is still invariant. Classes and structs do not support variance in C# 4.0. So the following doesn’t compile: // List implements the covariant interface // IEnumerable. But classes are invariant. List list = new List(); // Compiler error here." (<a href="http://blogs.msdn.com/b/csharpfaq/archive/2010/02/16/covariance-and-contravariance-faq.aspx" rel="nofollow">http://blogs.msdn.com/b/csharpfaq/archive/2010/02/16/covariance-and-contravariance-faq.aspx</a>)</p>
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    1. COyou need to define `<T>` at the class level, not at the method level.
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    2. COin my case that doenst work... i'll explain shortly
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    3. COif `T` is always an `ICommunication`, then why keep it generic?
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