IIdentifier interface

Defines the properties of an external content type identifier.

Namespace:  Microsoft.BusinessData.MetadataModel
Assembly:  Microsoft.BusinessData (in Microsoft.BusinessData.dll)

public interface IIdentifier : IMetadataObject, 

An external item is uniquely specified for an external content type for a specified set of values. For example, in a database external system, an external instance, corresponding to a row in a table could be identified by the primary key values. Each identifier describes one such value with the data type and the order of the value for an external content type.


Business Data Connectivity (BDC) service allows mapping identifiers to fields with nullable data types. However, for primary identifiers BDC will error out when the value of these identifiers are null.