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PODefault Property for dotNet Interop Usercontrol
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  1. PODefault Property for dotNet Interop Usercontrol
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    copied!<p>I need to set the default property of a dotNet Control used by an VB6 Application.</p> <pre><code>&lt;ComClass(myControl.ClassId, myControl.InterfaceId, myControl.EventsId)&gt; _ &lt;DefaultProperty("NewProperty")&gt; _ Public Class myControl Public Const ClassId As String = "86252de2-ca87-4468-adbe-ad7c47747759" Public Const InterfaceId As String = "c1cbf1a1-24bb-46c3-88a4-813eb4917845" Public Const EventsId As String = "954ed890-011c-4908-ab33-610159fe6eb1" Private newPropertyValue As String Public Property NewProperty() As String Get Return newPropertyValue End Get Set(ByVal value As String) newPropertyValue = value End Set End Property End Class </code></pre> <p>The DefualtProperty Attribute does not do the trick.</p> <p>I have read <a href="https://stackoverflow.com/questions/299251/exposing-the-indexer-default-property-via-com-interop">here</a> that manually setting the DispId to Zero should do the trick. But if I do this:</p> <pre><code>&lt;DispId(0)&gt; Public Property NewProperty() As String </code></pre> <p>Visual Basic kindly informs me that the DispId Zero is reserved for the DefaultProperty. Yeah. I know that. I want that. But how? </p> <p>Edit:</p> <pre><code>Default Public Property NewProperty(ByVal foo As Integer) As String </code></pre> <p>Does work as the property now shows up as the default property in VB6. But this will not solve my problem, because there is code which I can't change, which will do something like this:</p> <pre><code>aStringVariable = myUserControlInstance </code></pre> <p><a href="http://msdn.microsoft.com/en-us/library/h7bfkxc1(VS.71).aspx" rel="nofollow noreferrer">This MSDN article</a> has some information about this.</p>
 

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