ArcObjects Library Reference  (NetworkAnalyst)    

NALocator CoClass

Finds network locations for analysis.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server. Requires Network Analyst Extension.

Interfaces

Interfaces Description
IClone (esriSystem) Provides access to members that control cloning of objects.
INALocator Provides access to properties that apply to all network locators.
INALocator2 Provides access to properties that apply to all network locators.
IPersistStream (esriSystem)

Remarks

NALocator is a top-level container for managing and using network locators.  It has a collection of Locator Agents that do the work of finding the locations.

While NALocators are CoCreateable, you typically get the NALocator from the NAContext, which sets up the locator appropriately for the network dataset and type of analysis.