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    <p>Good catch. This looks like it's <em>possibly</em> a bug in the C# compiler - I'll ping Eric Lippert to see what he thinks. (<code>dynamic</code> can be a bit tricksy; there may well be a perfectly good but non-obvious reason for this error.)</p> <p>EDIT: <strong>The code below appears <em>not</em> to work after all.</strong> I could have sworn I had it working this morning... I'm very confused as to what's going on. As per Simon's comments, the code fails with a message saying it's not supported by the language.</p> <p>Note that if you <em>do</em> use explicit interface implementation, it appears to compile just fine:</p> <pre><code>// Doesn't actually compile - see edit above class MyInterface : IMyInterface { private Action&lt;dynamic&gt; foo; event Action&lt;dynamic&gt; IMyInterface.OnSomeEvent { // TODO (potentially): thread safety add { foo += value; } remove { foo -= value; } } } </code></pre> <hr> <p>EDIT: The rest of this answer still stands...</p> <p>Note that you can't specify a field-like event as an explicitly-implemented event, i.e. this doesn't work:</p> <pre><code>event Action&lt;dynamic&gt; IMyInterface.OnSomeEvent; </code></pre> <p>It gives the following error message:</p> <blockquote> <p>Test.cs(15,39): error CS0071: An explicit interface implementation of an event must use event accessor syntax </p> </blockquote> <p>And if you <em>just</em> try to change to the event accessor syntax, you get the same error as the original code.</p> <p>Note that changing the event to a property works fine with an auto-implemented property implementation.</p>
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    1. COI wonder how the Compiler would know how to protect overriding and then recognize what to do with dynamic when you compile the projects apart from each other.
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      1. USCaspar Kleijne
    2. COIs there anything to configure to have the explicit interface implementation work? I get a `error CS0682: 'ConsoleApplication1.MyInterface.ClassLibrary1.IMyInterface.OnSomeEvent' cannot implement 'ClassLibrary1.IMyInterface.OnSomeEvent' because it is not supported by the language` error trying to compile.
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      1. USSimon Mourier
    3. CO@Simon: What version of the C# compiler are you using? Dynamic was introduced in C# 4.
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