How to add helpstring in tlb generate from VB.NET or C# class

25. January 2012 11:34 by Mrojas in   //  Tags: , , , , ,   //   Comments (0)

In IDL you can have a helpstring attribute that adds descriptions to your interfaces.
To be able to generated those helpstring tags in a VB.NET  class you should use the Description tag

For example see this example taken from:

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

namespace ClassLibrary1 {
    [ComVisible(true), InterfaceType(ComInterfaceType.InterfaceIsDual)]
    public interface IFoo {
        int property {

NOTE: remenber that in some cases you have to apply the description attribute to both get and set.


After some test, I found that there are some differences with the helpstring behaviour in VB.NET. For example the helpstring attribute is not generated for methods. More on C#/VB.NET Interop Differences