Custom Properties in External Metadata not writeable using the Advanced Editor

Hello,

I'm working on a custom dataflow destination component. It makes use of the External Metadata Collection. I also use Custom Properties with the external metadata collection.

When I open the destination component using the Advanced Editor, and select an External Metadata Collection and change the Custom Property it always changes back to the original value.

Additionally the method SetExternalMetadataColumnProperty never gets called.

Here is a little Test Component that surfaces the problem:

[DtsPipelineComponent(ComponentType=ComponentType.DestinationAdapter, DisplayName="Test Destination")]
public class Class1 : PipelineComponent
{
public override void ProvideComponentProperties()
{
base.ProvideComponentProperties();

ComponentMetaData.InputCollection.RemoveAll();
IDTSInput90 input = ComponentMetaData.InputCollection.New();
input.Name = "Name";
input.ExternalMetadataColumnCollection.IsUsed = true;

IDTSExternalMetadataColumn90 ext = input.ExternalMetadataColumnCollection.New();
ext.Name = "ExtName";
IDTSCustomProperty90 customProp = ext.CustomPropertyCollection.New();
customProp.Name = "Custom Property";
customProp.Value = "Hallo";
}

public override IDTSCustomProperty90 SetExternalMetadataColumnProperty(int iID, int iExternalMetadataColumnID, string strPropertyName, object oValue)
{
return base.SetExternalMetadataColumnProperty(iID, iExternalMetadataColumnID, strPropertyName, oValue);
}
}

Any ideas how to make that work?

Georg

Are you sure that your SetExternalMetadataColumnProperty method is getting called? I believe you must implement the functionality to set the property yourself rather than delegating to the base class.|||

No, actually part of problem is that it never gets called when I change the property.

The method is only implemented for debugging. If you set a breakpoint in it, it never gets called. As far as I understand is, you would override this method just to implement additional functionality when a custom property of an External Metadata Column is changed, eg for validation.