MBR IT/.NET 247 : Can't use recursion with unmanaged components? on ASPFriends.com 'aspngmigrate' list

Can't use recursion with unmanaged components?

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Anders.Vikstrom@banqit.com

-- Moved from [aspngreuse] to [aspngmigrate] by Click here to reveal e-mail address --Hi,I wonder if somebody else has stumbled upon this problem:=20I've got C++ COM object with a property that is a collection of otherobjects of the same type:item.itemsIn my .NET application I recurs through this tree structure. Going out =tothe first leaf everything works fine. When the recursion turns back to =theroot I get an exception telling me "a read-only property can't be set". =From the stack trace it seems like .NET, for some strange reason, has =triedto set the items property on the item object. My guess is that it issomething wrong with the proxy object created by Visual Studio.Regards,Anders Vikstr=F6mSW Engineering, BANQIT ABhttp://www.banqit.commailto:Click here to reveal e-mail addresse: +46 8 7594737

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Anders.Vikstrom@banqit.com

Hmm... Maybee the problem is more general. The following code also fails:

    Dim myUnmanagedObject As Object = CreateObject("...")
    MyFunction(myUnmanagedObject.collection)

Wheras this code works:

    Dim myUnmanagedObject As Object = CreateObject("...")
    Dim myCollection As Object = myUnmanagedObject.collection
    MyFunction(myCollection)

I suppose it works since its okay to set the collection on the myCollection
variable. But why would .NET do that?

/Anders

-----Original Message-----
From: Anders Vikstrom
Sent: den 30 oktober 2001 15:22
To: aspngmigrate
Subject: [aspngmigrate] Can't use recursion with unmanaged components?

-- Moved from [aspngreuse] to [aspngmigrate] by Click here to reveal e-mail address --

Hi,

I wonder if somebody else has stumbled upon this problem:=20

I've got C++ COM object with a property that is a collection of other
objects of the same type:

item.items

In my .NET application I recurs through this tree structure. Going out =
to
the first leaf everything works fine. When the recursion turns back to =
the
root I get an exception telling me "a read-only property can't be set". =

From the stack trace it seems like .NET, for some strange reason, has =
tried
to set the items property on the item object. My guess is that it is
something wrong with the proxy object created by Visual Studio.

Regards,

Anders Vikstr=F6m
SW Engineering, BANQIT AB
http://www.banqit.com
mailto:Click here to reveal e-mail address
Phone: +46 8 7594737

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