ArcObjects Library Reference  (Controls)    

EngineNetworkAnalystEnvironment CoClass

A singleton object representing Engine Network Analyst environment.

Product Availability

Available with ArcGIS Engine.


The EngineNetworkAnalystEnvironment object is a singleton object (only one instance of the EngineNetworkAnalystEnvironment object is supported per process) that manages the INetworkLayer objects and the NAWindow.

Extended Error Information

Use the ISupportErrorInfo method InterfaceSupportsErrorInfo to determine if the object supports extended error information. If the object supports extended error info, VC++ developers should use the OLE/COM IErrorInfo interface to access the ErrorInfo object. Visual Basic developers should use the global error object Err to retrieve this extended error information.


Interfaces Description
IConnectionPointContainer Supports connection points for connectable objects.
IEngineNetworkAnalystEnvironment Provides access to the network analyst extension.
IEngineNetworkAnalystHelper Provides access to add a named geometry.
IExtension (esriSystem) Provides access to members that define an extension.
ISupportErrorInfo Indicates whether a specific interface can return Automation error objects.
IToolSelectedLayer (esriSystemUI) Provides access to members that set and get the current selected layer, which selection commands and tools works on.

Event Interfaces

Interfaces Description
IEngineNetworkAnalystEnvironmentEvents (default) Provides access to events triggered by the network analysis extension.
EngineNetworkAnalystEnvironment is the one and only instance of its class.

Working with Events

[Visual Basic 6.0]

When working with EngineNetworkAnalystEnvironment's default outbound interface in Visual Basic 6 declare variables as follows:

Private WithEvents pEngineNetworkAnalystEnvironment as EngineNetworkAnalystEnvironment