Everything I've read says that custom data flow components are built by inheriting from the Microsoft.SqlServer.Dts.Pipeline.PipelineComponent class.
But the stock components such as the Derived Column data flow transformation must each be implemented by their own class. So how do I base my custom components on those classes? The documentation for the PipelineComponent class doesn't list any such subclasses.
Not possible unfortunately. Those classes are not overrideable.
There is functionality hopefully coming in the next version which may mean this is possible (although via a slightly different method).
-Jamie
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