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Asked: May 11, 20262026-05-11T11:18:39+00:00 2026-05-11T11:18:39+00:00

How does one go about exposing a class written in Prism via COM Interop?

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How does one go about exposing a class written in Prism via COM Interop? For example, given the following interface:

TYPE   IFoo = public interface     property bar: string; read;   end;     FooImpl = class( IFoo )   private     function GetBar : string;   public     property bar: string; read GetBar;   end; 

In this example, assume IFoo was imported via TLBIMP and linked to the project.

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  1. 2026-05-11T11:18:40+00:00Added an answer on May 11, 2026 at 11:18 am

    use the ComVisible attribute to make the assembly and/or class public. When using tlbexp.exe (part of the .NET SDK) you’ll get the interface as a COM interface and the class as a CoClass for IFoo. Optionally you can use the Guid attribute to set a specific guid for your interface and (co) classes.

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