Input Column Generation Problem (GetVirtualInput)

Hi

I'm developing a Destination Component. I need to create the input columns in my ReinitializeMetadata() method. This is a small code sample of the method:




Code Snippet
IDTSInput90 input = ComponentMetaData.InputCollection[0];
input.InputColumnCollection.RemoveAll();
IDTSVirtualInput90 vInput = input.GetVirtualInput();
foreach( IDTSVirtualInputColumn90 vColumn in vInput.VirtualInputColumnCollection ) {
SetUsageType( input.ID, vInput, vColumn.LineageID, DTSUsageType.UT_READONLY );
}






This piece of code works fine, but now i want to use a UI Type DataFlowDestinationUI with a Destination mapping page added by base.AddDestinationMappingsPageToForm( form, "" );.

When I open the mapping page - ReinitializeMetadata() is called BEFORE opening this page - this error is shown:



Code Snippet
===================================
Exception from HRESULT: 0xC0047041 (Microsoft Visual Studio)
------------------------------
Program Location:
at Microsoft.SqlServer.Dts.Pipeline.Wrapper.IDTSVirtualInputColumn90.get_UsageType()
at Microsoft.DataTransformationServices.DataFlowUI.DataFlowDestinationUI.mappingPage_MapColumns(Object sender, MapColumnsEventArgs args)





I think it's because the mapping page calls GetVirtualInput() itself. Do you know a solution for this problem?

Thank you very much.


Manuel Bauer