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AutoCAD 2026 Developer and ObjectARX
    • Customization and Administration Guides
    • DXF Reference
    • AutoLISP and DCL
    • ActiveX and VBA
    • ObjectARX and Managed .NET
      • ObjectARX: Developer's Guide
      • ObjectARX: Reference Guide
      • ObjectARX: Managed .NET Developer's Guide
      • ObjectARX: Managed .NET Reference Guide
      • ObjectARX: Interoperability Guide
        • Namespaces and Naming Conventions
        • ObjectARX versus ObjectDBX Modules
        • User Interface Considerations (Dialogs, Commands, Menus, and System Variables)
        • ObjectARX Programming Practices
        • Custom Class Guidelines
          • Support Both DWG and DXF Storage Formats
          • Version Custom Objects
          • Supply a Basic ActiveX Implementation for Every Custom Object Class
          • Supply a Basic .NET Implementation for Every Custom Object Class
          • Support the Property Palette
          • Use ACRX_* Macros in Registered AcRxObject Classes
          • Override Required AcDb Member Functions
          • Implement AcDbEntity::subExplode() to Produce Native Entities
          • Avoid Use of __declspec(dllimport) on Class Definitions
        • Application Installation
        • Proper Use of Support Files
      • ObjectARX: Migration Guide
      • ObjectARX: Release Notes
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    Custom Class Guidelines

    The guidelines in this section do not apply to .NET or AutoLISP because those programming environments do not support custom class derivation.

    Topics in this section
    • Support Both DWG and DXF Storage Formats
    • Version Custom Objects
    • Supply a Basic ActiveX Implementation for Every Custom Object Class
    • Supply a Basic .NET Implementation for Every Custom Object Class
    • Support the Property Palette
    • Use ACRX_* Macros in Registered AcRxObject Classes
    • Override Required AcDb Member Functions
    • Implement AcDbEntity::subExplode() to Produce Native Entities
    • Avoid Use of __declspec(dllimport) on Class Definitions

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