AO的标注 没什么反映 奇怪

Public Sub Anno()
Dim pActiveView As IActiveView
Dim pDoc As IMxDocument, pMap As IMap
Dim pGeoLayer As IGeoFeatureLayer

Set pDoc = Application.Document
Set pMap = pDoc.FocusMap
Set pActiveView = pDoc.FocusMap
Set pGeoLayer = pMap.Layer(0)
' MsgBox pGeoLayer.Name
Dim pAnnoProps As IAnnotateLayerPropertiesCollection
Dim pAnnoLayerProps As IAnnotateLayerProperties
Dim pPosition As ILineLabelPosition
Dim pPlacement As ILineLabelPlacementPriorities
Dim pBasic As IBasicOverposterLayerProperties
Dim pLabelEngine As ILabelEngineLayerProperties
Dim pTextSyl As ITextSymbol

Set pAnnoProps = pGeoLayer.AnnotationProperties
pAnnoProps.Clear

Set pTextSyl = New TextSymbol

Dim pFont As stdole.StdFont
Set pFont = New stdole.StdFont
pFont.Name = "verdana"
pFont.size = 12
pTextSyl.Font = pFont
pTextSyl.Color =new HsvColor(250, 160, 200)
Set pPosition = New LineLabelPosition
pPosition.Parallel = False
pPosition.Perpendicular = True
Set pPlacement = New LineLabelPlacementPriorities
Set pBasic = New BasicOverposterLayerProperties

pBasic.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline
pBasic.LineLabelPlacementPriorities = pPlacement
pBasic.LineLabelPosition = pPosition
Set pLabelEngine = New LabelEngineLayerProperties
Set pLabelEngine.Symbol = pTextSyl
Set pLabelEngine.BasicOverposterLayerProperties = pBasic
pLabelEngine.Expression = "[44]"
Set pAnnoLayerProps = pLabelEngine
pAnnoProps.Add pAnnoLayerProps
pGeoLayer.DisplayAnnotation = True

pGeoLayer.DisplayField = pLabelEngine.Expression

pActiveView.Refresh