C-CANCEL requests are handled internally by DicomObjects, with the result that, once a cancel request has been detected, no further images or other data are sent on the connection, and a status of Cancelled is automatically returned to the peer.  In order to prevent errors from operations on a closed association, operations such as SendImages, SendData and SendStatus are still accepted, but are silently ignored.  This property is therefore provided solely as an optimisation, to prevent unnecessary preparatory work by the client application.

Note that DicomObjects only checks for C-CANCEL requests when it would otherwise be listening for data from the SCU, so this is between images for C-GET/MOVE but does not occur between C-FIND responses, as these are not acknowledged by the SCU.

DicomConnection Object  | DicomConnection Members