INetworkClass Interface

Provides access to members that return information about geometric networks, field weighting and ancillary roles.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

When To Use

Use the INetworkClass interface to get a reference to the geometric network which the network class (feature class) belongs to. You can also check to see if the network class has an Ancillary Role in the network, and the right to field mapping for the logical network.

The INetworkClass interface inherits from the IFeatureClass interface and the ITable interface.

Members

		Description
	AddField	Adds a field to this object class.
	AddIndex	Adds an index to this object class.
	AliasName	The alias name of the object class.
	AreaField	The geometry area field.
	CLSID	The GUID for the COM Class (CoClass) corresponding to instances of this object class.
	CreateFeature	Create a new feature, with a system assigned object ID and null property values.
	CreateFeatureBuffer	Create a feature buffer that can be used with an insert cursor.
	DeleteField	Deletes a field from this object class.
	DeleteIndex	Deletes an index from this object class.
	EXTCLSID	The GUID for the COM Class (CoClass) corresponding to the class extension for this object class.
	Extension	The extension for this object class.
	ExtensionProperties	The extension properties for this object class.
	FeatureClassID	The unique ID for the Feature Class.
	FeatureCount	The number of features selected by the specified query.
	FeatureDataset	The feature dataset that contains the feature class.
	FeatureType	The type of features in this feature class.
	Fields	The fields collection for this object class.
	FieldToWeightMapping	The specified field to Weight mapping for the logical network.
	FindField	The index of the field with the specified name.
	GeometricNetwork	The geometric network in which this class participates.
	GetFeature	Get the feature with the specified object ID.
	GetFeatures	Get a cursor of Rows given a set of object ids.
	HasOID	Indicates if the class has an object identity (OID) field.
	Indexes	The indexes collection for this object class.
	Insert	Returns a cursor that can be used to insert new features.
	LengthField	The geometry length field.
	NetworkAncillaryRole	The possible network ancillary roles of the contained Features.
	ObjectClassID	The unique ID for the object class.
	OIDFieldName	The name of the field corresponding to the OID.
	RelationshipClasses	The relationship classes in which this object class participates in for the specified role.
	Search	Returns an object cursor that can be used to fetch feature objects selected by the specified query.
	Select	Returns a selection That contains the object ids selected by the specified query.
	ShapeFieldName	The name of the default sShape field.
	ShapeType	The type of the default Shape for the features in this feature class.
	Update	Returns a cursor that can be used to update features selected by the specified query.

Inherited Interfaces

Interfaces	Description
IFeatureClass	Provides access to members that control the behavior and properties of a feature class.
IObjectClass	Provides access to members that return information about an object class.
IClass	Provides access to members that return information about and manage the class.

CoClasses that implement INetworkClass

CoClasses and Classes	Description
FeatureClass	FeatureClass Object.

Remarks

The FeatureType property of such feature classes will be one of esriFTSimpleJunction, esriDTSimpleEdge, esriFTComplexJunction, or esriFTComplexEdge.

You can QI (Query Interface) to any of these other interfaces on the FeatureClass object.

IDataset
IGeoDataset
ITable
INetworkClass
ISubtypes
IValidation

[C#]

The following example shows how to get a reference to an INetworkClass interface.

public void esriGeoDatabase__INetworkClass(IWorkspace workspace, string networkclassName)
{
    IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;
    INetworkClass networkClass = (INetworkClass)featureWorkspace.OpenFeatureClass(networkclassName);
}

[Visual Basic 6.0]

The following two examples are code excerpts that show how to get a reference to an INetworkClass interface with Visual Basic for Applications and Visual Basic respectivly.

When using VBA, you can use the table of contents in ArcMap to get at the network featureclass.

Dim pFeatcls As IFeatureClass
Dim pNetClass As INetworkClass
Dim pFeatLayer As IFeatureLayer
Dim pDoc As IMxDocument
Dim pMap As IMap

Set pDoc = ThisDocument
Set pMap = pDoc.Maps.Item(0)
Set pFeatLayer = pMap.Layer(0)
Set pFeatcls = pFeatLayer.FeatureClass
Set pNetClass = pFeatcls

Or you can use IMap::Layers to return an enumeration of layers corresponding to the network feature classes.

Dim pMxDocument As IMxDocument
Dim pMap As IMap
Dim pEnumLayer As IEnumLayer
Dim pLayer As ILayer
Dim pFLayer As IFeatureLayer
Dim pFC as IFeatureClass
Dim pId As New UID

Set pMxDocument = Application.Document
Set pMap = pMxDocument.FocusMap
'The GUID for Network Classes
pId = "{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}"
Set pEnumLayer = pMap.Layers(pId, False)
Set pFLayer = pLayer
Set pFC = pFLayer.FeatureClass

With Visual Basic, you are working outside of the application, so you need to use code to get the workspace object that contains the network feature class, then get the network feature class from there. This example has the location of the Access workspace hard-coded, but you could use the mini-browser to browse to the workspace, or the network feature class.

Dim pFact As IWorkspaceFactory
Set pFact = New AccessWorkspaceFactory
     
Dim pWorkspace As IWorkspace
Set pWorkspace = pFact.OpenFromFile("C:\data\electric.mdb", 0)
    
Dim pFeatws As IFeatureWorkspace
Set pFeatws = pWorkspace
    
Dim pFeatcls As IFeatureClass
Dim pNetClass As INetworkClass
Set pFeatcls = pFeatws.OpenFeatureClass("primaries")
Set pNetClass = pFeatcls

EDN: ESRI Developer Network