Namespaces
- Autodesk.Revit.ApplicationServices Namespace
- Autodesk.Revit.Attributes Namespace
- Autodesk.Revit.Creation Namespace
- Autodesk.Revit.DB Namespace
- Autodesk.Revit.DB.Analysis Namespace
- Autodesk.Revit.DB.Architecture Namespace
- Autodesk.Revit.DB.DirectContext3D Namespace
- Autodesk.Revit.DB.Electrical Namespace
- Autodesk.Revit.DB.Events Namespace
- Autodesk.Revit.DB.ExtensibleStorage Namespace
- Autodesk.Revit.DB.ExternalService Namespace
- Autodesk.Revit.DB.Fabrication Namespace
- Autodesk.Revit.DB.IFC Namespace
- Autodesk.Revit.DB.Lighting Namespace
- Autodesk.Revit.DB.Macros Namespace
- Autodesk.Revit.DB.Mechanical Namespace
- Autodesk.Revit.DB.Plumbing Namespace
- Autodesk.Revit.DB.PointClouds Namespace
- Autodesk.Revit.DB.Steel Namespace
- Autodesk.Revit.DB.Structure Namespace
- Autodesk.Revit.DB.Structure.StructuralSections Namespace
- Autodesk.Revit.DB.Visual Namespace
- Autodesk.Revit.Exceptions Namespace
- Autodesk.Revit.UI Namespace
  - AddInCommandBinding Class
    - AddInCommandBinding Members
    - AddInCommandBinding Methods
    - AddInCommandBinding Properties
    - AddInCommandBinding Events
      - BeforeExecuted Event
      - CanExecute Event
      - Executed Event
  - ButtonData Class
  - ColorSelectionDialog Class
  - ComboBox Class
  - ComboBoxData Class
  - ComboBoxMember Class
  - ComboBoxMemberData Class
  - ContextualHelp Class
  - ContextualHelpType Enumeration
  - DockablePane Class
  - DockablePaneId Class
  - DockablePaneProviderData Class
  - DockablePanes Class
  - DockablePanes.BuiltInDockablePanes Class
  - DockablePaneState Class
  - DockPosition Enumeration
  - DoubleClickAction Enumeration
  - DoubleClickOptions Class
  - DoubleClickTarget Enumeration
  - EditorInteraction Class
  - EditorInteractionType Enumeration
  - ExternalApplicationArray Class
  - ExternalApplicationArrayIterator Class
  - ExternalCommandData Class
  - ExternalEvent Class
  - ExternalEventRequest Enumeration
  - FaceBasedPlacementType Enumeration
  - FamilyInstancePlacingArgs Class
  - FileDialog Class
  - FileOpenDialog Class
  - FileSaveDialog Class
  - FilterDialog Class
  - IControllableDropHandler Interface
  - IDockablePaneProvider Interface
  - IDropHandler Interface
  - IExternalApplication Interface
  - IExternalCommand Interface
  - IExternalCommandAvailability Interface
  - IExternalEventHandler Interface
  - IExternalResourceUIServer Interface
  - IFrameworkElementCreator Interface
  - ItemSelectionDialogResult Enumeration
  - PostableCommand Enumeration
  - PreviewControl Class
  - PromptForFamilyInstancePlacementOptions Class
  - PulldownButton Class
  - PulldownButtonData Class
  - PushButton Class
  - PushButtonData Class
  - RadioButtonGroup Class
  - RadioButtonGroupData Class
  - Result Enumeration
  - RevitCommandId Class
  - RevitLinkUIUtils Class
  - RibbonButton Class
  - RibbonItem Class
  - RibbonItemData Class
  - RibbonItemType Enumeration
  - RibbonPanel Class
  - ScrollbarVisibility Enumeration
  - SelectionUIOptions Class
  - SetupEnergySimulationDialog Class
  - SetupEnergySimulationDialogResult Enumeration
  - SketchGalleryOptions Enumeration
  - SplitButton Class
  - SplitButtonData Class
  - Tab Enumeration
  - TabbedDialogAction Delegate
  - TabbedDialogExtension Class
  - TableViewUIUtils Class
  - TaskDialog Class
  - TaskDialogCommandLinkId Enumeration
  - TaskDialogCommonButtons Enumeration
  - TaskDialogIcon Enumeration
  - TaskDialogResult Enumeration
  - TextBox Class
  - TextBoxData Class
  - TextEditorOptions Class
  - ThinLinesOptions Class
  - ToggleButton Class
  - ToggleButtonData Class
  - UIApplication Class
  - UIControlledApplication Class
  - UIDocument Class
  - UIFabricationUtils Class
  - UISaveAsOptions Class
  - UITheme Enumeration
  - UIThemeManager Class
  - UIView Class
- Autodesk.Revit.UI.Events Namespace
- Autodesk.Revit.UI.Macros Namespace
- Autodesk.Revit.UI.Mechanical Namespace
- Autodesk.Revit.UI.Plumbing Namespace
- Autodesk.Revit.UI.Selection Namespace
What's New

CanExecute Event

Occurs when the command associated with this AddInCommandBinding initiates a check to determine whether the command can be executed on the command target.

Namespace: Autodesk.Revit.UI
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 20.0.0.0 (20.0.0.377)
Since: 2013

Syntax

C#
public event EventHandler<CanExecuteEventArgs> CanExecute

Visual Basic
Public Event CanExecute As EventHandler(Of CanExecuteEventArgs)

Visual C++
public: event EventHandler<CanExecuteEventArgs^>^ CanExecute { void add (EventHandler<CanExecuteEventArgs^>^ value); void remove (EventHandler<CanExecuteEventArgs^>^ value); }

Remarks

This callback will be called by Revit's user interface any time there is a contextual change. Therefore, the callback must be fast and is not permitted to be blocking in any way.

Syntax

Remarks

See Also