Programatically Create And Configure A FlatFileConnectionManager

I am writing some C# code that builds a package programatically. the package contains a flat file connection manager. I have referenced Microsoft.SqlServer.Dts.Runtime.Wrapper in order that I can use the ConnectionManagerFlatFileClass class.

Here is some of my code:

Package p = New package();

ConnectionManager sourceCM = p.Connections.Add("FLATFILE");

sourceCM.Name = "some-name";

ConnectionManagerFlatFileClass cmffc = sourceCM.InnerObject()

 

I get a compilation error on the last line saying I cannot implicitly cast as ConnectionManagerFlatFileClass. Fair enough, so I change the last line of code to:

ConnectionManagerFlatFileClass cmffc = (ConnectionManagerFlatFileClass)sourceCM.InnerObject()

Now it will compile. But when I run it I get the error:

"Unable to cast COM object of type 'System.__ComObject' to class type "Microsoft.SqlServer.Dts.Runtime.Wrapper.ConnectionManagerFlatFileClass'. COM components that enter the CLR and do not support IProvideClassInfo or that do not have interop assembly referenced will be wrapped in the __ComObject type. instances of this type cannot be cast to any other class; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface"

 

Can anyone tell me how I can cast the ConnectionManager.InnerObject as a ConnectionManagerFlatFileClass please?

-Jamie

 

P.S. My ultimate aim here is to set the metdata of each of the columns defined by the flat file connection manager. I can't see how I can do that without referring to the connection manager as a ConnectionManagerFlatFileClass!