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POOpen delegate for generic interface method
 

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    <p>I'm trying to create an <a href="http://peisker.net/dotnet/languages2005.htm#delegatetargets" rel="noreferrer">open instance delegate</a> for a generic interface method, but I keep receiving a NotSupportedException. Here is the simplified code that won't run:</p> <pre><code>interface IFoo { void Bar&lt;T&gt;(T j); } class Foo : IFoo { public void Bar&lt;T&gt;(T j) { } } static void Main(string[] args) { var bar = typeof(IFoo).GetMethod("Bar").MakeGenericMethod(typeof(int)); var x = Delegate.CreateDelegate(typeof(Action&lt;IFoo, int&gt;), null, bar); } </code></pre> <p>The last line throws NotSupportedException, "Specified method is not supported". By comparison, a non-generic open instance delegate runs fine:</p> <pre><code>interface IFoo { void Bar(int j); } class Foo : IFoo { public void Bar(int j) { } } static void Main(string[] args) { var bar = typeof(IFoo).GetMethod("Bar"); var x = Delegate.CreateDelegate(typeof(Action&lt;IFoo, int&gt;), null, bar); } </code></pre> <p>And a closed generic delegate also works:</p> <pre><code>interface IFoo { void Bar&lt;T&gt;(T j); } class Foo : IFoo { public void Bar&lt;T&gt;(T j) { } } static void Main(string[] args) { var bar = typeof(IFoo).GetMethod("Bar").MakeGenericMethod(typeof(int)); var x = Delegate.CreateDelegate(typeof(Action&lt;int&gt;), new Foo(), bar); } </code></pre> <p>So the recipe for closed generic delegates and open instance delegates work separately, but not when combined. It's starting to look like either a runtime bug, or intentional omission. Anyone have any insight here?</p>
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    1. COWhat version of .NET are you on? Your sample works fine for me (NET 4).
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    2. COVS2010 Sp1, compiled in .NET2, .NET35 and .NET4. No repro.
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    3. COSorry, I thought I had reproduced without the interface, but this morning it seems to work. Chalk it up to late night tiredness. I've restored the original version that still exhibits the problem.
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