IObjectClass Interface

Provides access to members that return information about an object class.

Product Availability

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

When To Use

The IObjectClass interface is the main interface used to get the properties of an object class in a geodatabase. An object class is a feature class or table that has been registered with the geodatabase. For example, you can use the IObjectClass interface to get a list of all the relationship classes in which an object class participates.

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.
	CLSID	The GUID for the COM Class (CoClass) corresponding to instances of this object class.
	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.
	Fields	The fields collection for this object class.
	FindField	The index of the field with the specified name.
	HasOID	Indicates if the class has an object identity (OID) field.
	Indexes	The indexes collection for this object class.
	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.

Inherited Interfaces

Interfaces	Description
IClass	Provides access to members that return information about and manage the class.

CoClasses that implement IObjectClass

CoClasses and Classes	Description
FeatureClass	FeatureClass Object.
NAClass (esriNetworkAnalyst)
ObjectClass	ObjectClass Object.
RasterBand (esriDataSourcesRaster)	A representation of a single band of a raster dataset on disk.
RasterCatalog	A collection of raster datasets in a Geodatabase table.
RasterLayer (esriCarto)	Raster layer source and display options.
RelQueryTable	An object that joins two datasets based on common data values.
RouteEventSource (esriLocation)	Route event source object.
SchematicDiagramClass (esriSchematic)	Schematic diagram class object.
SchematicElementClass (esriSchematic)	Schematic element class object.
TemporalFeatureClass (esriTrackingAnalyst)	Controls settings for the temporal feature class.
XYEventSource	XY event source object.

Remarks

All object classes support the IObjectClass interface and this interface inherits from the IClass interface. The CLSID, EXTCLSID, and Extension for an ObjectClass may be obtained via the corresponding methods inherited from IClass.

For programming convenience, pre-existing tables in the host RDBMS also support the IObjectClass interface even if they have not been registered with the geodatabase. Such tables can be distinguished from registered object classes because they return an ObjectClassID of -1 and return False to the HasOID method. New object classes in a geodatabase that are created using the CreateTable method on the IFeatureWorkspace interface are automatically registered with the geodatabase and assigned an object class ID.

If no AliasName has been defined for an object class, then the AliasName is equal
to the Name.

[Visual Basic 6.0]

The following two examples are code excerpts that show how to get to an IObjectClass interface in two different ways.

You can use the table of contents in ArcMap to get at a geodatabase table that may have been added.

Dim pDoc As IMxDocument

Dim pObjectClass As IObjectClass 

Dim pContentsView As IContentsView

  

Set pDoc = ThisDocument

Set pContentsView = pDoc.CurrentContentsView

If pContentsView.Name = "Source" Then ' Have Source tab on TOC open

  If TypeOf pContentsView.SelectedItem Is IObjectClass Then

    Set pObjectClass = pContentsView.SelectedItem

  End If

End If

Alternatively you could use code to get the workspace object, then open the table you want to work with and QI for its IObjectClass interface.

Dim pFact As IWorkspaceFactory

Set pFact = New SdeWorkspaceFactory



Dim pWorkspace As IWorkspace

Set pWorkspace = pFact.OpenFromFile("C:\\MyConnections\\redarrow_gdb.sde",0)



' QI for IFeatureWorkspace

Dim pFeatureWorkspace As IFeatureWorkspace

Set pFeatureWorkspace = pWorkspace

' Open a table

Dim pTable As ITable

Set pTable = pFeatureWorkspace.OpenTable("username.MyTable")



' QI for IObjectClass

Dim pObjectClass As IObjectClass

Set pObjectClass = pTable

Example

IObjectClass Example

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