# GrapeCity.Viewer.Common ## Content

GrapeCity.Viewer.Common Namespace

Represents a command that delegates its implementation to a delegate with a parameter of type TParm.

NullDelegateCommand implementation that represents a command that does nothing and is always disabled.

Defines the contract for commanding, using the same contract as used in WPF.

Defines the interface for loading documents.

Defines the interface for interacting with the HistoryService, allowing navigation and management of the page view history.

Defines the capability to load objects from both file and stream sources.

Represents a contract for defining report parameters.

Enumerates supported report formats for ActiveReports.

Defines the configuration options for the printing process.