Namespaces
- Autodesk.Revit.ApplicationServices
- Autodesk.Revit.Attributes
- Autodesk.Revit.Creation
- Autodesk.Revit.DB
- Autodesk.Revit.DB.Analysis
- Autodesk.Revit.DB.Architecture
- Autodesk.Revit.DB.DirectContext3D
- Autodesk.Revit.DB.Electrical
- Autodesk.Revit.DB.Events
- Autodesk.Revit.DB.ExtensibleStorage
- Autodesk.Revit.DB.ExternalService
- Autodesk.Revit.DB.Fabrication
- Autodesk.Revit.DB.IFC
- Autodesk.Revit.DB.Infrastructure
- Autodesk.Revit.DB.Lighting
- Autodesk.Revit.DB.Macros
- Autodesk.Revit.DB.Mechanical
- Autodesk.Revit.DB.Plumbing
- Autodesk.Revit.DB.PointClouds
- Autodesk.Revit.DB.Steel
- Autodesk.Revit.DB.Structure
- Autodesk.Revit.DB.Structure.StructuralSections
- Autodesk.Revit.DB.Visual
- Autodesk.Revit.Exceptions
- Autodesk.Revit.UI
- Autodesk.Revit.UI.Events
  - ApplicationClosingEventArgs Class
  - BeforeExecutedEventArgs Class
  - CanExecuteEventArgs Class
    - CanExecuteEventArgs Properties
    - CanExecuteEventArgs Methods
      - GetSelectedCategoryIds Method
  - ComboBoxCurrentChangedEventArgs Class
  - ComboBoxDropDownClosedEventArgs Class
  - ComboBoxDropDownOpenedEventArgs Class
  - CommandEventArgs Class
  - DialogBoxData Class
  - DialogBoxShowingEventArgs Class
  - DisplayingOptionsDialogEventArgs Class
  - DockableFrameFocusChangedEventArgs Class
  - DockableFrameVisibilityChangedEventArgs Class
  - ExecutedEventArgs Class
  - ExternalDataManagerChangedEventArgs Class
  - FabricationPartBrowserChangedEventArgs Class
  - FabricationPartBrowserOperation Enumeration
  - FormulaEditingEventArgs Class
  - IdlingEventArgs Class
  - MacroUpdatedEventArgs Class
  - MessageBoxData Class
  - MessageBoxShowingEventArgs Class
  - RibbonItemEventArgs Class
  - SelectionChangedEventArgs Class
  - TaskDialogShowingEventArgs Class
  - TextBoxEnterPressedEventArgs Class
  - ThemeChangedEventArgs Class
  - TransferredProjectStandardsEventArgs Class
  - TransferringProjectStandardsEventArgs Class
  - ViewActivatedEventArgs Class
  - ViewActivatingEventArgs Class
- Autodesk.Revit.UI.Macros
- Autodesk.Revit.UI.Mechanical
- Autodesk.Revit.UI.Plumbing
- Autodesk.Revit.UI.Selection
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Revit .NET 8 Upgrade Tips

CanExecuteEventArgs.GetSelectedCategoryIds Method

Revit 2026 API

CanExecuteEventArgsGetSelectedCategoryIds Method

Gets the category ids of selected elements.

Namespace: Autodesk.Revit.UI.Events
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 26.0.4.0 (26.0.4.0)

Syntax

public ICollection<ElementId> GetSelectedCategoryIds()

Public Function GetSelectedCategoryIds As ICollection(Of ElementId)

public:
ICollection<ElementId^>^ GetSelectedCategoryIds()

member GetSelectedCategoryIds : unit -> ICollection<ElementId>

Return Value

ICollectionElementId

Reference

CanExecuteEventArgs Class

Autodesk.Revit.UI.Events Namespace

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