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AutoCAD® Civil 3D® is a powerful civil engineering tool incorporating a dynamic engineering model that allows elements to be automatically updated in response to changes in your design. Using AutoCAD® Civil 3D® as a platform, you can take advantage of industry-standard development tools and technologies when building applications.
Learn more about the latest AutoCAD Civil 3D features at the AutoCAD Civil 3D product center.
There are three APIs available for customizing AutoCAD® Civil 3D®:
Because AutoCAD® Civil 3D® is based on AutoCAD®, you can take advantage of all the AutoCAD® source code samples for .NET that are included with the installation of AutoCAD® Civil 3D® software in the Samples directory. There are also additional AutoCAD Civil 3D® specific samples included in the installation.
AutoCAD Civil 3D API documentations is designed for developers who want to customize AutoCAD® Civil 3D® or create applications using the underlying APIs. The Developer’s Guide show how to create code with .NET API and legacy COM API, with explanations and sample codes. The .NET API Reference Guide contains a complete list of objects available.
Although AutoCAD® Civil 3D® does not expose an ObjectARX API, applications built with the AutoCAD ObjectARX SDK or the AutoCAD Map ObjectARX SDK will run within AutoCAD® Civil 3D®. Find out more details about the Tools and programming environments supported for customization and application development of AutoCAD Civil 3D referring to Civil 3D Developers Guide and API Reference Documents.
This tool allows developers inspect the Civil3D Database without writing code. It works by showing the root objects of Civil3D (i.e. Styles, Alignments, Corridors, Assemblies, Subassemblies, Pipe networks and Surfaces) listing them on the left with all objects on each collections, such as all alignments on the active drawing, and once click on each item, list all its properties on right.
To use this tool, follow the instructions at this blog post.