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    <pre><code>int Hoop(); </code></pre> <p>is an incorrect translation of the IDL declaration into C#. The correct one would be </p> <pre><code>void Hoop(); </code></pre> <p>.NET wraps COM result codes (HRESULT) into correspondent C# exceptions. For example if you return E_NOTIMPL in C++ code, .NET runtime will throw an instance of the NotImplementedException class</p> <p>*<strong><em>UPDATE</em>*</strong></p> <p>According, to <a href="http://msdn.microsoft.com/en-us/library/system.threading.thread.apartmentstate.aspx" rel="nofollow">MSDN</a>, the main application thread is initialized to 'MTA' by default. Your object CSimpleObject is configured to reside in the 'STA'. In order to make cross-apartament calls, the COM runtime will use <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms692621%28v=vs.85%29.aspx" rel="nofollow">your implementation of the proxy/stub to marshall</a> the corresponding data. </p> <p>The runtime needs a valid proxy/stub implementation which is generated by MIDL from your IDL file. </p> <p>You have marked the 'Hoop' function as "Local". This means that MIDL will not generate any marshalling code for this method, that is why you get an exception.</p> <p>One should remove the 'local' attribute since it is designed to be used only inside the server where an object is implemented. But as a possible solution I may suggest you to use the object from a thread configured to run in STA. Anyway, this is a bad approach, since it doesn't guarantees, that no marshalling will be involved.</p> <p>You may mark your main thread to run in STA as follows:</p> <pre><code>[STAThread()] static void Main(string[] args) { ... } </code></pre> <p>I hope this will help you to solve the problem.</p>
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    1. POUsing IUnknown derived ATL COM object in .NET
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    1. USIgor Chornous
    1. USIgor Chornous
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    1. COUnfortunately, this does not work. PreserveSigAttribute attribute allows to get the result code (HRESULT) through the return value.
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    2. COvpp, I'm sorry, I didn't notice this attribute. I have updated the answer
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    3. COIt works! Thank you, kids_fox!!!
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