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POFxCop (/VS2010 Code Analysis), possible to flag method result as "callers responsibility now" for IDisposable?
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  1. POFxCop (/VS2010 Code Analysis), possible to flag method result as "callers responsibility now" for IDisposable?
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    copied!<p>If I write the following code:</p> <pre><code>public void Execute() { var stream = new MemoryStream(); ... } </code></pre> <p>then code analysis will flag this as:</p> <blockquote> <p>Warning 1 CA2000 : Microsoft.Reliability : In method 'ServiceUser.Execute()', call System.IDisposable.Dispose on object 'stream' before all references to it are out of scope. C:\Dev\VS.NET\DisposeTest\DisposeTest\ServiceUser.cs 14 DisposeTest</p> </blockquote> <p>However, if I create a factory pattern, I still might be required to dispose of the object, but now FxCop/Code Analysis doesn't complain. <strike>Rather, it complains about the factory method, not the code that calls it.</strike> <em>(I think I had an example that did complain about the factory method, but the one I post here doesn't, so I struck that out)</em></p> <p>Is there a way, for instance using attributes, to move the responsibility of the IDisposable object out of the factory method and onto the caller instead?</p> <p>Take this code:</p> <pre><code>public class ServiceUser { public void Execute() { var stream = StreamFactory.GetStream(); Debug.WriteLine(stream.Length); } } public static class StreamFactory { public static Stream GetStream() { return new MemoryStream(); } } </code></pre> <p>In this case, there are no warnings. I'd like FxCOP/CA to still complain about my original method. It is still my responsibility to handle that object.</p> <p>Is there any way I can tell FxCOP/CA about this? For instance, I recently ventured into the annotation attributes that ReSharper has provided, in order to tell its analysis engine information it would otherwise not be able to understand.</p> <p>So I envision something like this:</p> <pre><code>public static class StreamFactory { [return: CallerResponsibility] public static Stream GetStream() { return new MemoryStream(); } } </code></pre> <p>Or is this design way off?</p>
 

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