Building Custom Component - marking all inputs

I have been building a custom component with the default GUI. I want to have all the input fields selected to be passed through to outputs without having to explicitly check each one in the GUI. Is there some method or property to set on the input to do this?

You have to map ExternalMetadataColumnID from source to destination

|||I'm not sure this is specific to SSIS. That is, you might want to look at the appropriate .Net forum for specifics on how to code the GUI for your project.|||

I would normally do this in the UI itself, but that would be a custom UI, not the standard UI you get for free, as you cannot extend that one at all.

You could do this in ReinitializeMetaData, such that if no columns are found, and you have forced RMD to build the input/output columns for the first time, when adding you also select the columns as you create them.

How you select the column, the equivalent of selecting a column in the UI, will depend on what type of component you are writing, but normally revolves around setting the usage type, or mapping input/output columns to external metadata columns.