Automatically Select Input Columns in a Custom Data Flow Component

The following code snippet can be used in a custom data flow component to automatically select all input columns when you attach a path.

public override void OnInputPathAttached(int inputID)
{
	base.OnInputPathAttached(inputID);

	for (int i = 0; i < ComponentMetaData.InputCollection.Count; i++)
	{
		ComponentMetaData.InputCollection[i].InputColumnCollection.RemoveAll();
		IDTSVirtualInput100 input = ComponentMetaData.InputCollection[i].GetVirtualInput();
		foreach (IDTSVirtualInputColumn100 vcol in input.VirtualInputColumnCollection)
		{
			input.SetUsageType(vcol.LineageID, DTSUsageType.UT_READONLY);
		}
	}
}

This is the equivalent to clicking the Select All box in the Advanced Editor.

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