Engine中如何只显示可视范围内数据的图例（动态图例）？

Dim doc As IMxDocument = m_application.Document 

Dim map As IMap = doc.FocusMap 



Dim autoVisibility as Boolean= True 



Dim legend As Legend = Nothing 



For i As Integer = 0 To map.MapSurroundCount - 1 

If map.MapSurround(i).Name() = Legend Then 

legend = TryCast(map.MapSurround(i), Legend) 

End If 

Next 



If legend IsNot Nothing Then 

For i As Integer = 0 To legend.ItemCount - 1 

Dim item As IDynamicLegendItem = TryCast(legend.Item(i), IDynamicLegendItem) 

If item IsNot Nothing Then 

item.AutoVisibility = autoVisibility 

End If 

Next 

End If