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    <p>You could simplify the .NET Code like this (remove all MarshalAs that should be done automatically):</p> <pre><code>[ComVisible(true)] public class MyRootClass : IMyRootClass // some class to start with { public IEmailEntity[] GetEntities() { List&lt;IEmailEntity&gt; list = new List&lt;IEmailEntity&gt;(); for(int i = 0; i &lt; 10; i++) { EmailEntity entity = new EmailEntity(); List&lt;IEmailAddress&gt; addresses = new List&lt;IEmailAddress&gt;(); addresses.Add(new EmailAddress { Name = "Joe" + i }); entity.BccRecipients = addresses.ToArray(); entity.Body = "hello world " + i; list.Add(entity); } return list.ToArray(); } } [ComVisible(true)] public interface IMyRootClass { IEmailEntity[] GetEntities(); } public class EmailEntity : IEmailEntity { public IEmailAddress[] BccRecipients { get; set; } public string Body { get; set; } } public class EmailAddress : IEmailAddress { public string Address { get; set; } public string Name { get; set; } } [ComVisible(true)] public interface IEmailAddress { string Address { get; set; } string Name { get; set; } } [ComVisible(true)] public interface IEmailEntity { IEmailAddress[] BccRecipients { get; set; } string Body { get; set; } // to be continued... } </code></pre> <p>To use it with C++, you need to register the DLL and build a .TLB (Type Library file) as explained in a similar answer here: <a href="https://stackoverflow.com/questions/15793668/implement-a-c-sharp-dll-com-file-in-unmanaged-c-program">Implement a C# DLL COM File In Unmanaged C++ Program</a></p> <p>Then, you can access these classes in C++, like this:</p> <pre><code>#include "stdafx.h" #import "c:\MyPathToTheTlb\YourAssembly.tlb" // import the COM TLB using namespace YourAssembly; int _tmain(int argc, _TCHAR* argv[]) { CoInitialize(NULL); IMyRootClassPtr ptr(__uuidof(MyRootClass)); CComSafeArray&lt;IUnknown*&gt; entities = ptr-&gt;GetEntities(); // CComSafeArray needs atlsafe.h in the PCH for(int i = entities.GetLowerBound(0); i &lt;= entities.GetUpperBound(0); i++) { IEmailEntityPtr entity; entities.GetAt(i).QueryInterface(&amp;entity); _bstr_t body = entity-&gt;Body; printf("%S\n", body.GetBSTR()); CComSafeArray&lt;IUnknown*&gt; recipients = entity-&gt;BccRecipients; for(int j = recipients.GetLowerBound(0); j &lt;= recipients.GetUpperBound(0); j++) { IEmailAddressPtr address; recipients.GetAt(j).QueryInterface(&amp;address); _bstr_t name = address-&gt;Name; printf(" %S\n", name.GetBSTR()); } } CoUninitialize(); } </code></pre>
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    1. COYou'll need to use the [InterfaceType] attribute to make this code work. Right now, the interfaces are only accessible late-bound, the default is ComInterfaceType.InterfaceIsIDispatch.
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    2. CO@HansPassant - This code works fine as is. I believe the default is dual.
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    3. COYou are right, color me purple. Looks like I'll have to edit some answers here and there :(
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