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POGeneric method call, don't want to send in my types
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  1. POGeneric method call, don't want to send in my types
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    copied!<p>I'm experimenting with my Commands and some generic methods. I havn't used generics that much so now my brain is all messed up and hoping for some help.</p> <p>What I want is the last test to pass. And return my TResult without me needing to supply the TCommand, TResult in the call.</p> <pre><code>invoker.Execute(command) </code></pre> <p>Since that command implements </p> <pre><code>: CommandBase&lt;TestResult&gt; </code></pre> <p>I though that the compiler would figure it out.</p> <p>But the compiler only takes me the to the void method.</p> <p>Huge thanks in advance!</p> <p>Edit: The complete code is available at: <a href="http://codepaste.net/7rjg2e" rel="nofollow">http://codepaste.net/7rjg2e</a></p> <p><strong>CommandInvoker</strong></p> <pre><code>public interface ICommandInvoker { void Execute&lt;TCommand&gt;(TCommand command) where TCommand : ICommand; TResult Execute&lt;TCommand, TResult&gt;(TCommand command) where TCommand : ICommand&lt;TResult&gt;; } public class CommandInvoker : ICommandInvoker { ... public void Execute&lt;TCommand&gt;(TCommand command) where TCommand : ICommand { var handler = _container.GetInstance&lt;ICommandHandler&lt;TCommand&gt;&gt;(); handler.Handle(command); _session.SaveChanges(); } public TResult Execute&lt;TCommand, TResult&gt;(TCommand command) where TCommand : ICommand&lt;TResult&gt; { var handler = _container.GetInstance&lt;ICommandHandler&lt;TCommand&gt;&gt;(); handler.Handle(command); return command.Result; } } </code></pre> <p><strong>Commands</strong></p> <pre><code>public interface ICommand { bool IsValid { get; } } public interface ICommand&lt;TResult&gt; : ICommand { TResult Result { get; } } public class CommandBase : ICommand { public bool IsValid { get { return false; } } } public class CommandBase&lt;TResult&gt; : ICommand&lt;TResult&gt; { public bool IsValid { get { return false; } } public TResult Result { get; set; } } </code></pre> <p><strong>CommandHandler</strong></p> <pre><code>public interface ICommandHandler&lt;TCommand&gt; { void Handle(TCommand command); } public interface ICommandHandlerWithResult&lt;TCommand, TResult&gt; where TCommand : ICommand&lt;TResult&gt; { void Handle(TCommand command); } </code></pre> <p><strong>Test classes</strong></p> <pre><code>public class TestCommandWithResult : CommandBase&lt;TestResult&gt; { public string Id { get; set; } } public class TestResult { public string Message { get; set; } } </code></pre> <p><strong>Test thats works</strong></p> <pre><code>[Test] public void CanExcecuteWithResult() { var command = new TestCommandWithResult { Id = "billy" }; ObjectFactory.ResetDefaults(); var mockHandler = new Mock&lt;ICommandHandler&lt;TestCommandWithResult&gt;&gt;(); var sessionMock = new Mock&lt;ISession&gt;(); ObjectFactory.Configure(x =&gt; x.For&lt;ICommandHandler&lt;TestCommandWithResult&gt;&gt;().Use(mockHandler.Object)); var invoker = new CommandInvoker(ObjectFactory.Container, sessionMock.Object); var result = invoker.Execute&lt;TestCommandWithResult, TestResult&gt;(command); mockHandler.Verify(x =&gt; x.Handle(command)); } </code></pre> <p><strong>Test that I want to pass</strong></p> <pre><code> [Test] public void CanExcecuteWithResult() { var command = new TestCommandWithResult { Id = "billy" }; ObjectFactory.ResetDefaults(); var mockHandler = new Mock&lt;ICommandHandler&lt;TestCommandWithResult&gt;&gt;(); var sessionMock = new Mock&lt;ISession&gt;(); ObjectFactory.Configure(x =&gt; x.For&lt;ICommandHandler&lt;TestCommandWithResult&gt;&gt;().Use(mockHandler.Object)); var invoker = new CommandInvoker(ObjectFactory.Container, sessionMock.Object); var result = invoker.Execute(command); // &lt;-- this only calls void version mockHandler.Verify(x =&gt; x.Handle(command)); } </code></pre>
 

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