Removes a layer from the Network Analysis extension.
[Visual Basic .NET] Public Sub DropLayer ( _ ByVal Layer As ILayer _ )
[C#] public void DropLayer ( ILayer Layer );
Product Availability
Available with ArcGIS Desktop.
Remarks
The Network Analysis Extension manages the feature layers for the current network. Only those feature layers added to the Extension are considered when the user interacts with the map, such as adding flags and barriers using the Flag and Barrier tools, displaying the flow arrows, and drawing the results of a trace task.
The DropLayer method removes a reference to a feature layer from the Network Analysis Extension. If there are no more feature layers corresponding to this geometric network that are referenced by the Extension, then the geometric network is removed from the Extension.
Feature layers are added to the Extension using the AddLayer method, and removed using the DropLayer method. The AddNetwork method does not explicitly add layers to the Extension.
In general, it is not necessary to manually add and drop layers from the Network Analysis Extension, as the Extension automatically performs this when a feature layer from the current network is added or deleted from the focus map of the document.
The DropLayer method does not mark any feature layers as untraversable in the trace analysis. Use INetworkAnalysisExtBarriers::SetDisabledLayer to make feature layers untraversable in the analysis.