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    <p>Your IDL isn't valid, an interface that is attributed with [oleautomation] should derive from IDispatch, not IUnknown. I'll give the proper declarations and hint where you need to modify them to get yours.</p> <p>You cannot declare indexed properties in C#, the C# team refuses to implement them. Version 4 has support for indexed properties that are declared in a COM type library but still doesn't allow declaring them yourself. The workaround is to use the VB.NET language, it has no qualms about it. Add a VB.NET class library project to your solution. Make it look similar to this:</p> <pre><code>Imports System.Runtime.InteropServices Namespace Mumble &lt;ComVisible(True)&gt; _ &lt;Guid("2352FDD4-F7C9-443a-BC3F-3EE230EF6C1B")&gt; _ &lt;InterfaceType(ComInterfaceType.InterfaceIsDual)&gt; _ Public Interface IExample &lt;DispId(0)&gt; _ Property Indexer(ByVal index As Integer) As Integer &lt;DispId(1)&gt; _ Property SomeProperty(ByVal index As Integer) As String End Interface End Namespace </code></pre> <p>Note the use of <code>&lt;DispId&gt;</code>, dispid 0 is special, it is the default property of an interface. This corresponds to the indexer in the C# language.</p> <p>All you need VB.NET for is the declaration, you can still write the <em>implementation</em> of the interface in the C# language. Project + Add Reference, Projects tab and select the VB.NET project. Make it look similar to this:</p> <pre><code>using System; using System.Runtime.InteropServices; namespace Mumble { [ComVisible(true)] [Guid("8B72CE6C-511F-456e-B71B-ED3B3A09A03C")] [ClassInterface(ClassInterfaceType.None)] public class Implementation : ClassLibrary2.Mumble.IExample { public int get_Indexer(int index) { return index; } public void set_Indexer(int index, int Value) { } public string get_SomeProperty(int index) { return index.ToString(); } public void set_SomeProperty(int index, string Value) { } } } </code></pre> <p>You need to run Tlbexp.exe on <em>both</em> the VB.NET and the C# assembly to generate the type libraries. The C# one with the implementation includes the VB.NET one.</p> <p>To get the interface to derive from IUnknown instead of IDispatch, edit the interface declaration. Remove the DispId attributes and use ComInterfaceType.InterfaceIsUnknown</p>
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    1. COHi Hans. I works with a VB-interface. Thanks for the answer.
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      1. USSøren Randrup
 

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