SelectionSet-Get the currently selected records(rows or features)

1、地图级别的选择 IMap.Featureselection

2、图层级别的选择 IFeatureselection.SelectionSet (Featurelayer支持三个重要的接口IFeatureLayer\IGeoFeaturelayer\IFeatureselection，各有不用用处)

public sub getlayerselection()

dim pmxdoc as imxdocument

dim pfsel as ifeatuerselection

dim pselset as iselectionset

set pmxdoc=thisdocument

set pfsel=pmxdoc.selectedlayer

set pselset=pfsel.selectionset

msgbox "pselset.count"

end sub