Spotfire.Dxp.Data.VirtualColumns Namespace TIBCO Spotfire 7.0 API Reference
The Spotfire.Dxp.Data.VirtualColumn namespace contains classes used for adding virtual columns.

A virtual column is a data column that only retrieves values on-demand.

The collection of VirtualColumns available to the end-user can be extended. CustomVirtualColumnProducer for the base class that needs to be implemented in order to extend the application with new functionality.

Classes
  Class Description
Public class VirtualColumn
A column where the values are fetched one by one as they're needed rather than all at once.
Public class VirtualColumn PropertyNames
Contains property name constants for the public properties of VirtualColumn.
Public class VirtualColumnAvailableInputCollection
Represents the available inputs for a virtual column producer.
Public class VirtualColumnAvailableInputCollection PropertyNames
Contains property name constants for the public properties of VirtualColumnAvailableInputCollection.
Public class VirtualColumnCollection
A collection of virtual columns.
Public class VirtualColumnCollection PropertyNames
Contains property name constants for the public properties of VirtualColumnProducerCollection.
Public class VirtualColumnInputCollection
Represents the inputs for one or several virtual columns.
Public class VirtualColumnInputCollection PropertyNames
Contains property name constants for the public properties of VirtualColumnInputCollection.
Public class VirtualColumnInputIdentifier
Used to uniquely identify the inputs of a virtual column.
Public class VirtualColumnProducer
A class which produces virtual columns.
Public class VirtualColumnProducer PropertyNames
Contains property name constants for the public properties of VirtualColumnProducer.
Public class VirtualColumnProducer VirtualColumnInputIdentifiers
Implement this to contain VirtualColumnInputIdentifier objects to uniquely identify each input collection in this VirtualColumnProducer.
Public class VirtualColumnProducerCollection
A collection of virtual column producers.
Public class VirtualColumnProducerCollection PropertyNames
Contains property name constants for the public properties of VirtualColumnProducerCollection.
Public class VirtualColumnsConfigurator
Used to add the virtual columns to a VirtualColumnProducer.
Public class VirtualValueRequest
Represents the input and result for a value in a virtual column.
Public class VirtualValueWorker TModel 
A class that serves as a worker for a VirtualColumnProducer.