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POC# internal static extern with InternalCall attribute - internal or external?
 

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    <p>In <a href="https://stackoverflow.com/questions/1200602/why-is-there-no-managed-md5-implementation-in-the-net-framework">another question</a> I asked, a comment arose indicating that the .NET framework's <code>Array.Copy</code> method uses unmanaged code. I went digging with <a href="http://www.red-gate.com/products/reflector/" rel="nofollow noreferrer">Reflector</a> and found the signature one of the <code>Array.Copy</code> method overloads is defined as so:</p> <pre><code>[MethodImpl(MethodImplOptions.InternalCall), ReliabilityContract(Consistency.MayCorruptInstance, Cer.MayFail)] internal static extern void Copy(Array sourceArray, int sourceIndex, Array destinationArray, int destinationIndex, int length, bool reliable); </code></pre> <p>After looking at this, I'm slightly confused. The source of my confusion is the <code>extern</code> modifier which means (<a href="http://msdn.microsoft.com/en-us/library/e59b22c5.aspx" rel="nofollow noreferrer">MSDN</a> link):</p> <blockquote> <p>The extern modifier is used to declare a method that is implemented externally.</p> </blockquote> <p>However, the method declaration is also decorated with a <code>MethodImplOptions.InternalCall</code> attribute, which indicates (<a href="http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.methodimploptions.aspx" rel="nofollow noreferrer">MSDN</a> link):</p> <blockquote> <p>Specifies an internal call. An internal call is a call to a method that is implemented within the common language runtime itself.</p> </blockquote> <p>Can anyone explain this seemingly apparent contradiction?</p>
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