HighLight selected features

高亮顯示被選中feature,并可控制非選擇feature顯示或隱藏...

使用IQueryFilter過濾選擇集，利用IFeatureSelection.SelectionSymbol設置被選擇要素的外觀。

IFeatureLayerDefinition.DefinitionExpression用于控制圖層上的要素顯示狀態。

Private   Sub SearchSlope() Sub SearchSlope(pLayer As ILayer, strSlopes As String, chkfilterValue As Boolean)
 
    Dim pFeaturelayer As IFeatureLayer
    Set pFeaturelayer = pLayer
    
    Dim pFeatureSelection As IFeatureSelection
    Set pFeatureSelection = pFeaturelayer
    
    Dim pDefFeatLayer As IFeatureLayerDefinition
    Set pDefFeatLayer = pFeaturelayer
    If chkfilterValue = True Then
        pDefFeatLayer.DefinitionExpression = "SLOPENO IN (" & strSlopes & ")"
    Else
        pDefFeatLayer.DefinitionExpression = ""
    End If
    
    Dim pFilter As IQueryFilter
    Set pFilter = New QueryFilter
    pFilter.WhereClause = "SLOPENO IN (" & strSlopes & ")"

    Dim pFillSym As ISimpleFillSymbol
    Set pFillSym = New SimpleFillSymbol

    pFillSym.Style = esriSFSDiagonalCross
    pFeatureSelection.SetSelectionSymbol = True

    Set pFeatureSelection.SelectionSymbol = pFillSym

    pFeatureSelection.SelectFeatures pFilter, esriSelectionResultNew, False

 End Sub