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    <p>As you noted, in C++/CLI we implement ~ClassName and !ClassName, and the C++/CLI compiler writes Dispose(void) and Dispose(bool) for us.</p> <p>I tried deriving from HashAlgorithm, and I was able to get both the dispose &amp; finalize to work. Perhaps there's a subtle difference in how you have some of the methods declared.</p> <p>Here's my test code:</p> <pre><code>public ref class CppDispose : HashAlgorithm { private: ~CppDispose() { Debug::WriteLine("~CppDispose"); } !CppDispose() { Debug::WriteLine("!CppDispose"); } protected: virtual void HashCore(array&lt;Byte&gt;^ aray, int ibStart, int cbSize) override { } virtual array&lt;Byte&gt;^ HashFinal() override { return nullptr; } public: virtual void Initialize() override { } }; int main(array&lt;System::String ^&gt; ^args) { { CppDispose foo; Debug::WriteLine("Disposing: "); } { CppDispose^ foo = gcnew CppDispose(); Debug::WriteLine("Finalizing: "); foo = nullptr; GC::Collect(); } return 0; } </code></pre> <p>Output:</p> <pre> Disposing: ~CppDispose Finalizing: !CppDispose </pre> <p>So that you can see what's going on behind the scenes, here's the methods that the C++/CLI compiler wrote for us, decompiled to C# syntax. In this case, the parent class has Dispose(void) implemented, so it's not reimplemented here.</p> <pre><code>[HandleProcessCorruptedStateExceptions] protected override void Dispose([MarshalAs(UnmanagedType.U1)] bool flag1) { if (flag1) { try { this.~CppDispose(); } finally { base.Dispose(true); } } else { try { this.!CppDispose(); } finally { base.Dispose(false); } } } protected override void Finalize() { this.Dispose(false); } </code></pre>
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    1. COthanks for the example David. I compared my code to your example and they are almost exactly the same. I had dtor and finalizer as public, changed that but no go. Only different I see now is I have code in header and cpp file. I will try to play around with more when I get home.
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    2. COI tried just now. When I create a console app it works fine, when I try to call from unit test I get the error.
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    3. COI copied my class from a console app to a DLL, and created both a C# and C++/CLI test project. Both of them were able to instantiate the test class, and get both the dispose and finalizer to run. Are you using the MSTest framework for your unit testing, or something else?
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